params: release Geth v1.9.17

accounts, internal: fix funding check when estimating gas (#21346 )
* internal, accounts: fix funding check when estimate gas * accounts, internal: address comments
2020-07-20 15:56:42 +03:00 · 2020-07-20 15:52:42 +03:00 · 2020-07-20 11:47:13 +03:00 · 2020-07-20 11:46:41 +03:00 · 2020-07-16 15:08:38 +03:00 · 2020-07-16 15:06:19 +03:00
743 changed files with 60316 additions and 14749 deletions
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -3,21 +3,21 @@

 accounts/usbwallet              @karalabe
 accounts/scwallet               @gballet
-accounts/abi                    @gballet
+accounts/abi                    @gballet @MariusVanDerWijden
 cmd/clef                        @holiman
 cmd/puppeth                     @karalabe
 consensus                       @karalabe
 core/                           @karalabe @holiman @rjl493456442
-dashboard/                      @kurkomisi
 eth/                            @karalabe @holiman @rjl493456442
 graphql/                        @gballet
 les/                            @zsfelfoldi @rjl493456442
 light/                          @zsfelfoldi @rjl493456442
 mobile/                         @karalabe @ligi
+node/                           @fjl @renaynay
 p2p/                            @fjl @zsfelfoldi
 rpc/                            @fjl @holiman
-p2p/simulations                 @zelig @janos @justelad
-p2p/protocols                   @zelig @janos @justelad
-p2p/testing                     @zelig @janos @justelad
+p2p/simulations                 @fjl
+p2p/protocols                   @fjl
+p2p/testing                     @fjl
 signer/                         @holiman
-whisper/                        @gballet @gluk256
+whisper/                        @gballet
--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@@ -2,7 +2,7 @@ Hi there,

 Please note that this is an issue tracker reserved for bug reports and feature requests.

-For general questions please use the gitter channel or the Ethereum stack exchange at https://ethereum.stackexchange.com.
+For general questions please use [discord](https://discord.gg/nthXNEv) or the Ethereum stack exchange at https://ethereum.stackexchange.com.

 #### System information

--- a/.golangci.yml
+++ b/.golangci.yml
@@ -1,11 +1,13 @@
 # This file configures github.com/golangci/golangci-lint.

 run:
-  timeout: 2m
+  timeout: 3m
  tests: true
  # default is true. Enables skipping of directories:
  #   vendor$, third_party$, testdata$, examples$, Godeps$, builtin$
  skip-dirs-use-default: true
+  skip-files:
+    - core/genesis_alloc.go

 linters:
  disable-all: true
@@ -43,3 +45,6 @@ issues:
    - path: core/vm/instructions_test.go
      linters:
        - goconst
+    - path: cmd/faucet/
+      linters:
+        - deadcode
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,12 +2,21 @@ language: go
 go_import_path: github.com/ethereum/go-ethereum
 sudo: false
 jobs:
+  allow_failures:
+    - stage: build
+      os: osx
+      go: 1.14.x
+      env:
+        - azure-osx
+        - azure-ios
+        - cocoapods-ios
+
  include:
-        # This builder only tests code linters on latest version of Go
+    # This builder only tests code linters on latest version of Go
    - stage: lint
      os: linux
      dist: xenial
-      go: 1.13.x
+      go: 1.14.x
      env:
        - lint
      git:
@@ -18,17 +27,7 @@ jobs:
    - stage: build
      os: linux
      dist: xenial
-      go: 1.11.x
-      env:
-        - GO111MODULE=on
-      script:
-        - go run build/ci.go install
-        - go run build/ci.go test -coverage $TEST_PACKAGES
-
-    - stage: build
-      os: linux
-      dist: xenial
-      go: 1.12.x
+      go: 1.13.x
      env:
        - GO111MODULE=on
      script:
@@ -40,7 +39,9 @@ jobs:
      os: linux
      arch: amd64
      dist: xenial
-      go: 1.13.x
+      go: 1.14.x
+      env:
+        - GO111MODULE=on
      script:
        - go run build/ci.go install
        - go run build/ci.go test -coverage $TEST_PACKAGES
@@ -50,14 +51,19 @@ jobs:
      os: linux
      arch: arm64
      dist: xenial
-      go: 1.13.x
+      go: 1.14.x
+      env:
+        - GO111MODULE=on
      script:
        - go run build/ci.go install
        - go run build/ci.go test -coverage $TEST_PACKAGES

    - stage: build
      os: osx
-      go: 1.13.x
+      osx_image: xcode11.3
+      go: 1.14.x
+      env:
+        - GO111MODULE=on
      script:
        - echo "Increase the maximum number of open file descriptors on macOS"
        - NOFILE=20480
@@ -76,9 +82,10 @@ jobs:
      if: type = push
      os: linux
      dist: xenial
-      go: 1.13.x
+      go: 1.14.x
      env:
        - ubuntu-ppa
+        - GO111MODULE=on
      git:
        submodules: false # avoid cloning ethereum/tests
      addons:
@@ -92,7 +99,7 @@ jobs:
            - python-paramiko
      script:
        - echo '|1|7SiYPr9xl3uctzovOTj4gMwAC1M=|t6ReES75Bo/PxlOPJ6/GsGbTrM0= ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA0aKz5UTUndYgIGG7dQBV+HaeuEZJ2xPHo2DS2iSKvUL4xNMSAY4UguNW+pX56nAQmZKIZZ8MaEvSj6zMEDiq6HFfn5JcTlM80UwlnyKe8B8p7Nk06PPQLrnmQt5fh0HmEcZx+JU9TZsfCHPnX7MNz4ELfZE6cFsclClrKim3BHUIGq//t93DllB+h4O9LHjEUsQ1Sr63irDLSutkLJD6RXchjROXkNirlcNVHH/jwLWR5RcYilNX7S5bIkK8NlWPjsn/8Ua5O7I9/YoE97PpO6i73DTGLh5H9JN/SITwCKBkgSDWUt61uPK3Y11Gty7o2lWsBjhBUm2Y38CBsoGmBw==' >> ~/.ssh/known_hosts
-        - go run build/ci.go debsrc -goversion 1.13.4 -upload ethereum/ethereum -sftp-user geth-ci -signer "Go Ethereum Linux Builder <geth-ci@ethereum.org>"
+        - go run build/ci.go debsrc -goversion 1.14.2 -upload ethereum/ethereum -sftp-user geth-ci -signer "Go Ethereum Linux Builder <geth-ci@ethereum.org>"

    # This builder does the Linux Azure uploads
    - stage: build
@@ -100,9 +107,10 @@ jobs:
      os: linux
      dist: xenial
      sudo: required
-      go: 1.13.x
+      go: 1.14.x
      env:
        - azure-linux
+        - GO111MODULE=on
      git:
        submodules: false # avoid cloning ethereum/tests
      addons:
@@ -136,9 +144,10 @@ jobs:
      dist: xenial
      services:
        - docker
-      go: 1.13.x
+      go: 1.14.x
      env:
        - azure-linux-mips
+        - GO111MODULE=on
      git:
        submodules: false # avoid cloning ethereum/tests
      script:
@@ -179,10 +188,11 @@ jobs:
      env:
        - azure-android
        - maven-android
+        - GO111MODULE=on
      git:
        submodules: false # avoid cloning ethereum/tests
      before_install:
-        - curl https://dl.google.com/go/go1.13.linux-amd64.tar.gz | tar -xz
+        - curl https://dl.google.com/go/go1.14.2.linux-amd64.tar.gz | tar -xz
        - export PATH=`pwd`/go/bin:$PATH
        - export GOROOT=`pwd`/go
        - export GOPATH=$HOME/go
@@ -200,11 +210,12 @@ jobs:
    - stage: build
      if: type = push
      os: osx
-      go: 1.13.x
+      go: 1.14.x
      env:
        - azure-osx
        - azure-ios
        - cocoapods-ios
+        - GO111MODULE=on
      git:
        submodules: false # avoid cloning ethereum/tests
      script:
@@ -231,9 +242,10 @@ jobs:
      if: type = cron
      os: linux
      dist: xenial
-      go: 1.13.x
+      go: 1.14.x
      env:
        - azure-purge
+        - GO111MODULE=on
      git:
        submodules: false # avoid cloning ethereum/tests
      script:
--- a/2
+++ b/2
@@ -1,5 +1,5 @@
 # Build Geth in a stock Go builder container
-FROM golang:1.13-alpine as builder
+FROM golang:1.14-alpine as builder

 RUN apk add --no-cache make gcc musl-dev linux-headers git

--- a/Dockerfile.alltools
+++ b/Dockerfile.alltools
@@ -1,5 +1,5 @@
 # Build Geth in a stock Go builder container
-FROM golang:1.13-alpine as builder
+FROM golang:1.14-alpine as builder

 RUN apk add --no-cache make gcc musl-dev linux-headers git

--- a/43
+++ b/43
@@ -10,33 +10,34 @@

 GOBIN = ./build/bin
 GO ?= latest
+GORUN = env GO111MODULE=on go run

 geth:
-	build/env.sh go run build/ci.go install ./cmd/geth
+	$(GORUN) build/ci.go install ./cmd/geth
 	@echo "Done building."
 	@echo "Run \"$(GOBIN)/geth\" to launch geth."

 all:
-	build/env.sh go run build/ci.go install
+	$(GORUN) build/ci.go install

 android:
-	build/env.sh go run build/ci.go aar --local
+	$(GORUN) build/ci.go aar --local
 	@echo "Done building."
 	@echo "Import \"$(GOBIN)/geth.aar\" to use the library."

 ios:
-	build/env.sh go run build/ci.go xcode --local
+	$(GORUN) build/ci.go xcode --local
 	@echo "Done building."
 	@echo "Import \"$(GOBIN)/Geth.framework\" to use the library."

 test: all
-	build/env.sh go run build/ci.go test
+	$(GORUN) build/ci.go test

 lint: ## Run linters.
-	build/env.sh go run build/ci.go lint
+	$(GORUN) build/ci.go lint

 clean:
-	go clean -cache
+	env GO111MODULE=on go clean -cache
 	rm -fr build/_workspace/pkg/ $(GOBIN)/*

 # The devtools target installs tools required for 'go generate'.
@@ -63,12 +64,12 @@ geth-linux: geth-linux-386 geth-linux-amd64 geth-linux-arm geth-linux-mips64 get
 	@ls -ld $(GOBIN)/geth-linux-*

 geth-linux-386:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/386 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/386 -v ./cmd/geth
 	@echo "Linux 386 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep 386

 geth-linux-amd64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/amd64 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/amd64 -v ./cmd/geth
 	@echo "Linux amd64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep amd64

@@ -77,42 +78,42 @@ geth-linux-arm: geth-linux-arm-5 geth-linux-arm-6 geth-linux-arm-7 geth-linux-ar
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm

 geth-linux-arm-5:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/arm-5 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm-5 -v ./cmd/geth
 	@echo "Linux ARMv5 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm-5

 geth-linux-arm-6:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/arm-6 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm-6 -v ./cmd/geth
 	@echo "Linux ARMv6 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm-6

 geth-linux-arm-7:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/arm-7 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm-7 -v ./cmd/geth
 	@echo "Linux ARMv7 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm-7

 geth-linux-arm64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/arm64 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm64 -v ./cmd/geth
 	@echo "Linux ARM64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm64

 geth-linux-mips:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/mips --ldflags '-extldflags "-static"' -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mips --ldflags '-extldflags "-static"' -v ./cmd/geth
 	@echo "Linux MIPS cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep mips

 geth-linux-mipsle:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/mipsle --ldflags '-extldflags "-static"' -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mipsle --ldflags '-extldflags "-static"' -v ./cmd/geth
 	@echo "Linux MIPSle cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep mipsle

 geth-linux-mips64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/mips64 --ldflags '-extldflags "-static"' -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mips64 --ldflags '-extldflags "-static"' -v ./cmd/geth
 	@echo "Linux MIPS64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep mips64

 geth-linux-mips64le:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/mips64le --ldflags '-extldflags "-static"' -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mips64le --ldflags '-extldflags "-static"' -v ./cmd/geth
 	@echo "Linux MIPS64le cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep mips64le

@@ -121,12 +122,12 @@ geth-darwin: geth-darwin-386 geth-darwin-amd64
 	@ls -ld $(GOBIN)/geth-darwin-*

 geth-darwin-386:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=darwin/386 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=darwin/386 -v ./cmd/geth
 	@echo "Darwin 386 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-darwin-* | grep 386

 geth-darwin-amd64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=darwin/amd64 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=darwin/amd64 -v ./cmd/geth
 	@echo "Darwin amd64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-darwin-* | grep amd64

@@ -135,11 +136,11 @@ geth-windows: geth-windows-386 geth-windows-amd64
 	@ls -ld $(GOBIN)/geth-windows-*

 geth-windows-386:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=windows/386 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=windows/386 -v ./cmd/geth
 	@echo "Windows 386 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-windows-* | grep 386

 geth-windows-amd64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=windows/amd64 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=windows/amd64 -v ./cmd/geth
 	@echo "Windows amd64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-windows-* | grep amd64
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Official Golang implementation of the Ethereum protocol.

 [![API Reference](
 https://camo.githubusercontent.com/915b7be44ada53c290eb157634330494ebe3e30a/68747470733a2f2f676f646f632e6f72672f6769746875622e636f6d2f676f6c616e672f6764646f3f7374617475732e737667
-)](https://godoc.org/github.com/ethereum/go-ethereum)
+)](https://pkg.go.dev/github.com/ethereum/go-ethereum?tab=doc)
 [![Go Report Card](https://goreportcard.com/badge/github.com/ethereum/go-ethereum)](https://goreportcard.com/report/github.com/ethereum/go-ethereum)
 [![Travis](https://travis-ci.org/ethereum/go-ethereum.svg?branch=master)](https://travis-ci.org/ethereum/go-ethereum)
 [![Discord](https://img.shields.io/badge/discord-join%20chat-blue.svg)](https://discord.gg/nthXNEv)
@@ -16,7 +16,7 @@ archives are published at https://geth.ethereum.org/downloads/.

 For prerequisites and detailed build instructions please read the [Installation Instructions](https://github.com/ethereum/go-ethereum/wiki/Building-Ethereum) on the wiki.

-Building `geth` requires both a Go (version 1.10 or later) and a C compiler. You can install
+Building `geth` requires both a Go (version 1.13 or later) and a C compiler. You can install
 them using your favourite package manager. Once the dependencies are installed, run

 ```shell
@@ -39,7 +39,7 @@ directory.
 |  **`geth`**   | Our main Ethereum CLI client. It is the entry point into the Ethereum network (main-, test- or private net), capable of running as a full node (default), archive node (retaining all historical state) or a light node (retrieving data live). It can be used by other processes as a gateway into the Ethereum network via JSON RPC endpoints exposed on top of HTTP, WebSocket and/or IPC transports. `geth --help` and the [CLI Wiki page](https://github.com/ethereum/go-ethereum/wiki/Command-Line-Options) for command line options.          |
 |   `abigen`    | Source code generator to convert Ethereum contract definitions into easy to use, compile-time type-safe Go packages. It operates on plain [Ethereum contract ABIs](https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI) with expanded functionality if the contract bytecode is also available. However, it also accepts Solidity source files, making development much more streamlined. Please see our [Native DApps](https://github.com/ethereum/go-ethereum/wiki/Native-DApps:-Go-bindings-to-Ethereum-contracts) wiki page for details. |
 |  `bootnode`   | Stripped down version of our Ethereum client implementation that only takes part in the network node discovery protocol, but does not run any of the higher level application protocols. It can be used as a lightweight bootstrap node to aid in finding peers in private networks.                                                                                                                                                                                                                                                                 |
-|     `evm`     | Developer utility version of the EVM (Ethereum Virtual Machine) that is capable of running bytecode snippets within a configurable environment and execution mode. Its purpose is to allow isolated, fine-grained debugging of EVM opcodes (e.g. `evm --code 60ff60ff --debug`).                                                                                                                                                                                                                                                                     |
+|     `evm`     | Developer utility version of the EVM (Ethereum Virtual Machine) that is capable of running bytecode snippets within a configurable environment and execution mode. Its purpose is to allow isolated, fine-grained debugging of EVM opcodes (e.g. `evm --code 60ff60ff --debug run`).                                                                                                                                                                                                                                                                     |
 | `gethrpctest` | Developer utility tool to support our [ethereum/rpc-test](https://github.com/ethereum/rpc-tests) test suite which validates baseline conformity to the [Ethereum JSON RPC](https://github.com/ethereum/wiki/wiki/JSON-RPC) specs. Please see the [test suite's readme](https://github.com/ethereum/rpc-tests/blob/master/README.md) for details.                                                                                                                                                                                                     |
 |   `rlpdump`   | Developer utility tool to convert binary RLP ([Recursive Length Prefix](https://github.com/ethereum/wiki/wiki/RLP)) dumps (data encoding used by the Ethereum protocol both network as well as consensus wise) to user-friendlier hierarchical representation (e.g. `rlpdump --hex CE0183FFFFFFC4C304050583616263`).                                                                                                                                                                                                                                 |
 |   `puppeth`   | a CLI wizard that aids in creating a new Ethereum network.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
@@ -72,7 +72,7 @@ This command will:
   This tool is optional and if you leave it out you can always attach to an already running
   `geth` instance with `geth attach`.

-### A Full node on the Ethereum test network
+### A Full node on the Görli test network

 Transitioning towards developers, if you'd like to play around with creating Ethereum
 contracts, you almost certainly would like to do that without any real money involved until
@@ -81,23 +81,24 @@ network, you want to join the **test** network with your node, which is fully eq
 the main network, but with play-Ether only.

 ```shell
-$ geth --testnet console
+$ geth --goerli console
 ```

 The `console` subcommand has the exact same meaning as above and they are equally
-useful on the testnet too. Please see above for their explanations if you've skipped here.
+useful on the testnet too. Please, see above for their explanations if you've skipped here.

-Specifying the `--testnet` flag, however, will reconfigure your `geth` instance a bit:
+Specifying the `--goerli` flag, however, will reconfigure your `geth` instance a bit:

+ * Instead of connecting the main Ethereum network, the client will connect to the Görli
+   test network, which uses different P2P bootnodes, different network IDs and genesis
+   states.
 * Instead of using the default data directory (`~/.ethereum` on Linux for example), `geth`
-   will nest itself one level deeper into a `testnet` subfolder (`~/.ethereum/testnet` on
+   will nest itself one level deeper into a `goerli` subfolder (`~/.ethereum/goerli` on
   Linux). Note, on OSX and Linux this also means that attaching to a running testnet node
   requires the use of a custom endpoint since `geth attach` will try to attach to a
-   production node endpoint by default. E.g.
-   `geth attach <datadir>/testnet/geth.ipc`. Windows users are not affected by
+   production node endpoint by default, e.g.,
+   `geth attach <datadir>/goerli/geth.ipc`. Windows users are not affected by
   this.
- * Instead of connecting the main Ethereum network, the client will connect to the test
-   network, which uses different P2P bootnodes, different network IDs and genesis states.

 *Note: Although there are some internal protective measures to prevent transactions from
 crossing over between the main network and test network, you should make sure to always
@@ -107,17 +108,26 @@ accounts available between them.*

 ### Full node on the Rinkeby test network

-The above test network is a cross-client one based on the ethash proof-of-work consensus
-algorithm. As such, it has certain extra overhead and is more susceptible to reorganization
-attacks due to the network's low difficulty/security. Go Ethereum also supports connecting
-to a proof-of-authority based test network called [*Rinkeby*](https://www.rinkeby.io)
-(operated by members of the community). This network is lighter, more secure, but is only
-supported by go-ethereum.
+Go Ethereum also supports connecting to the older proof-of-authority based test network
+called [*Rinkeby*](https://www.rinkeby.io) which is operated by members of the community.

 ```shell
 $ geth --rinkeby console
 ```

+### Full node on the Ropsten test network
+
+In addition to Görli and Rinkeby, Geth also supports the ancient Ropsten testnet. The
+Ropsten test network is based on the Ethash proof-of-work consensus algorithm. As such,
+it has certain extra overhead and is more susceptible to reorganization attacks due to the
+network's low difficulty/security.
+
+```shell
+$ geth --ropsten console
+```
+
+*Note: Older Geth configurations store the Ropsten database in the `testnet` subdirectory.*
+
 ### Configuration

 As an alternative to passing the numerous flags to the `geth` binary, you can also pass a
@@ -152,7 +162,7 @@ above command does.  It will also create a persistent volume in your home direct
 saving your blockchain as well as map the default ports. There is also an `alpine` tag
 available for a slim version of the image.

-Do not forget `--rpcaddr 0.0.0.0`, if you want to access RPC from other containers
+Do not forget `--http.addr 0.0.0.0`, if you want to access RPC from other containers
 and/or hosts. By default, `geth` binds to the local interface and RPC endpoints is not
 accessible from the outside.

@@ -172,16 +182,16 @@ you'd expect.

 HTTP based JSON-RPC API options:

-  * `--rpc` Enable the HTTP-RPC server
-  * `--rpcaddr` HTTP-RPC server listening interface (default: `localhost`)
-  * `--rpcport` HTTP-RPC server listening port (default: `8545`)
-  * `--rpcapi` API's offered over the HTTP-RPC interface (default: `eth,net,web3`)
-  * `--rpccorsdomain` Comma separated list of domains from which to accept cross origin requests (browser enforced)
+  * `--http` Enable the HTTP-RPC server
+  * `--http.addr` HTTP-RPC server listening interface (default: `localhost`)
+  * `--http.port` HTTP-RPC server listening port (default: `8545`)
+  * `--http.api` API's offered over the HTTP-RPC interface (default: `eth,net,web3`)
+  * `--http.corsdomain` Comma separated list of domains from which to accept cross origin requests (browser enforced)
  * `--ws` Enable the WS-RPC server
-  * `--wsaddr` WS-RPC server listening interface (default: `localhost`)
-  * `--wsport` WS-RPC server listening port (default: `8546`)
-  * `--wsapi` API's offered over the WS-RPC interface (default: `eth,net,web3`)
-  * `--wsorigins` Origins from which to accept websockets requests
+  * `--ws.addr` WS-RPC server listening interface (default: `localhost`)
+  * `--ws.port` WS-RPC server listening port (default: `8546`)
+  * `--ws.api` API's offered over the WS-RPC interface (default: `eth,net,web3`)
+  * `--ws.origins` Origins from which to accept websockets requests
  * `--ipcdisable` Disable the IPC-RPC server
  * `--ipcapi` API's offered over the IPC-RPC interface (default: `admin,debug,eth,miner,net,personal,shh,txpool,web3`)
  * `--ipcpath` Filename for IPC socket/pipe within the datadir (explicit paths escape it)
@@ -217,7 +227,8 @@ aware of and agree upon. This consists of a small JSON file (e.g. call it `genes
    "eip158Block": 0,
    "byzantiumBlock": 0,
    "constantinopleBlock": 0,
-    "petersburgBlock": 0
+    "petersburgBlock": 0,
+    "istanbulBlock": 0
  },
  "alloc": {},
  "coinbase": "0x0000000000000000000000000000000000000000",
@@ -294,7 +305,7 @@ also need to configure a miner to process transactions and create new blocks for
 Mining on the public Ethereum network is a complex task as it's only feasible using GPUs,
 requiring an OpenCL or CUDA enabled `ethminer` instance. For information on such a
 setup, please consult the [EtherMining subreddit](https://www.reddit.com/r/EtherMining/)
-and the [Genoil miner](https://github.com/Genoil/cpp-ethereum) repository.
+and the [ethminer](https://github.com/ethereum-mining/ethminer) repository.

 In a private network setting, however a single CPU miner instance is more than enough for
 practical purposes as it can produce a stable stream of blocks at the correct intervals
--- a/accounts/abi/abi.go
+++ b/accounts/abi/abi.go
@@ -19,10 +19,12 @@ package abi
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"

 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
 )

 // The ABI holds information about a contract's context and available
@@ -32,6 +34,12 @@ type ABI struct {
 	Constructor Method
 	Methods     map[string]Method
 	Events      map[string]Event
+
+	// Additional "special" functions introduced in solidity v0.6.0.
+	// It's separated from the original default fallback. Each contract
+	// can only define one fallback and receive function.
+	Fallback Method // Note it's also used to represent legacy fallback before v0.6.0
+	Receive  Method
 }

 // JSON returns a parsed ABI interface and error if it failed.
@@ -42,7 +50,6 @@ func JSON(reader io.Reader) (ABI, error) {
 	if err := dec.Decode(&abi); err != nil {
 		return ABI{}, err
 	}
-
 	return abi, nil
 }

@@ -70,7 +77,7 @@ func (abi ABI) Pack(name string, args ...interface{}) ([]byte, error) {
 		return nil, err
 	}
 	// Pack up the method ID too if not a constructor and return
-	return append(method.ID(), arguments...), nil
+	return append(method.ID, arguments...), nil
 }

 // Unpack output in v according to the abi specification
@@ -108,12 +115,22 @@ func (abi ABI) UnpackIntoMap(v map[string]interface{}, name string, data []byte)
 // UnmarshalJSON implements json.Unmarshaler interface
 func (abi *ABI) UnmarshalJSON(data []byte) error {
 	var fields []struct {
-		Type      string
-		Name      string
-		Constant  bool
+		Type    string
+		Name    string
+		Inputs  []Argument
+		Outputs []Argument
+
+		// Status indicator which can be: "pure", "view",
+		// "nonpayable" or "payable".
+		StateMutability string
+
+		// Deprecated Status indicators, but removed in v0.6.0.
+		Constant bool // True if function is either pure or view
+		Payable  bool // True if function is payable
+
+		// Event relevant indicator represents the event is
+		// declared as anonymous.
 		Anonymous bool
-		Inputs    []Argument
-		Outputs   []Argument
 	}
 	if err := json.Unmarshal(data, &fields); err != nil {
 		return err
@@ -123,43 +140,67 @@ func (abi *ABI) UnmarshalJSON(data []byte) error {
 	for _, field := range fields {
 		switch field.Type {
 		case "constructor":
-			abi.Constructor = Method{
-				Inputs: field.Inputs,
+			abi.Constructor = NewMethod("", "", Constructor, field.StateMutability, field.Constant, field.Payable, field.Inputs, nil)
+		case "function":
+			name := abi.overloadedMethodName(field.Name)
+			abi.Methods[name] = NewMethod(name, field.Name, Function, field.StateMutability, field.Constant, field.Payable, field.Inputs, field.Outputs)
+		case "fallback":
+			// New introduced function type in v0.6.0, check more detail
+			// here https://solidity.readthedocs.io/en/v0.6.0/contracts.html#fallback-function
+			if abi.HasFallback() {
+				return errors.New("only single fallback is allowed")
 			}
-		// empty defaults to function according to the abi spec
-		case "function", "":
-			name := field.Name
-			_, ok := abi.Methods[name]
-			for idx := 0; ok; idx++ {
-				name = fmt.Sprintf("%s%d", field.Name, idx)
-				_, ok = abi.Methods[name]
+			abi.Fallback = NewMethod("", "", Fallback, field.StateMutability, field.Constant, field.Payable, nil, nil)
+		case "receive":
+			// New introduced function type in v0.6.0, check more detail
+			// here https://solidity.readthedocs.io/en/v0.6.0/contracts.html#fallback-function
+			if abi.HasReceive() {
+				return errors.New("only single receive is allowed")
 			}
-			abi.Methods[name] = Method{
-				Name:    name,
-				RawName: field.Name,
-				Const:   field.Constant,
-				Inputs:  field.Inputs,
-				Outputs: field.Outputs,
+			if field.StateMutability != "payable" {
+				return errors.New("the statemutability of receive can only be payable")
 			}
+			abi.Receive = NewMethod("", "", Receive, field.StateMutability, field.Constant, field.Payable, nil, nil)
 		case "event":
-			name := field.Name
-			_, ok := abi.Events[name]
-			for idx := 0; ok; idx++ {
-				name = fmt.Sprintf("%s%d", field.Name, idx)
-				_, ok = abi.Events[name]
-			}
-			abi.Events[name] = Event{
-				Name:      name,
-				RawName:   field.Name,
-				Anonymous: field.Anonymous,
-				Inputs:    field.Inputs,
-			}
+			name := abi.overloadedEventName(field.Name)
+			abi.Events[name] = NewEvent(name, field.Name, field.Anonymous, field.Inputs)
+		default:
+			return fmt.Errorf("abi: could not recognize type %v of field %v", field.Type, field.Name)
 		}
 	}
-
 	return nil
 }

+// overloadedMethodName returns the next available name for a given function.
+// Needed since solidity allows for function overload.
+//
+// e.g. if the abi contains Methods send, send1
+// overloadedMethodName would return send2 for input send.
+func (abi *ABI) overloadedMethodName(rawName string) string {
+	name := rawName
+	_, ok := abi.Methods[name]
+	for idx := 0; ok; idx++ {
+		name = fmt.Sprintf("%s%d", rawName, idx)
+		_, ok = abi.Methods[name]
+	}
+	return name
+}
+
+// overloadedEventName returns the next available name for a given event.
+// Needed since solidity allows for event overload.
+//
+// e.g. if the abi contains events received, received1
+// overloadedEventName would return received2 for input received.
+func (abi *ABI) overloadedEventName(rawName string) string {
+	name := rawName
+	_, ok := abi.Events[name]
+	for idx := 0; ok; idx++ {
+		name = fmt.Sprintf("%s%d", rawName, idx)
+		_, ok = abi.Events[name]
+	}
+	return name
+}
+
 // MethodById looks up a method by the 4-byte id
 // returns nil if none found
 func (abi *ABI) MethodById(sigdata []byte) (*Method, error) {
@@ -167,7 +208,7 @@ func (abi *ABI) MethodById(sigdata []byte) (*Method, error) {
 		return nil, fmt.Errorf("data too short (%d bytes) for abi method lookup", len(sigdata))
 	}
 	for _, method := range abi.Methods {
-		if bytes.Equal(method.ID(), sigdata[:4]) {
+		if bytes.Equal(method.ID, sigdata[:4]) {
 			return &method, nil
 		}
 	}
@@ -178,9 +219,41 @@ func (abi *ABI) MethodById(sigdata []byte) (*Method, error) {
 // ABI and returns nil if none found.
 func (abi *ABI) EventByID(topic common.Hash) (*Event, error) {
 	for _, event := range abi.Events {
-		if bytes.Equal(event.ID().Bytes(), topic.Bytes()) {
+		if bytes.Equal(event.ID.Bytes(), topic.Bytes()) {
 			return &event, nil
 		}
 	}
 	return nil, fmt.Errorf("no event with id: %#x", topic.Hex())
 }
+
+// HasFallback returns an indicator whether a fallback function is included.
+func (abi *ABI) HasFallback() bool {
+	return abi.Fallback.Type == Fallback
+}
+
+// HasReceive returns an indicator whether a receive function is included.
+func (abi *ABI) HasReceive() bool {
+	return abi.Receive.Type == Receive
+}
+
+// revertSelector is a special function selector for revert reason unpacking.
+var revertSelector = crypto.Keccak256([]byte("Error(string)"))[:4]
+
+// UnpackRevert resolves the abi-encoded revert reason. According to the solidity
+// spec https://solidity.readthedocs.io/en/latest/control-structures.html#revert,
+// the provided revert reason is abi-encoded as if it were a call to a function
+// `Error(string)`. So it's a special tool for it.
+func UnpackRevert(data []byte) (string, error) {
+	if len(data) < 4 {
+		return "", errors.New("invalid data for unpacking")
+	}
+	if !bytes.Equal(data[:4], revertSelector) {
+		return "", errors.New("invalid data for unpacking")
+	}
+	var reason string
+	typ, _ := NewType("string", "", nil)
+	if err := (Arguments{{Type: typ}}).Unpack(&reason, data[4:]); err != nil {
+		return "", err
+	}
+	return reason, nil
+}
--- a/accounts/abi/abi_test.go
+++ b/accounts/abi/abi_test.go
@@ -19,6 +19,7 @@ package abi
 import (
 	"bytes"
 	"encoding/hex"
+	"errors"
 	"fmt"
 	"math/big"
 	"reflect"
@@ -26,57 +27,105 @@ import (
 	"testing"

 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/math"
 	"github.com/ethereum/go-ethereum/crypto"
 )

 const jsondata = `
 [
-	{ "type" : "function", "name" : "balance", "constant" : true },
-	{ "type" : "function", "name" : "send", "constant" : false, "inputs" : [ { "name" : "amount", "type" : "uint256" } ] }
+	{ "type" : "function", "name" : "", "stateMutability" : "view" },
+	{ "type" : "function", "name" : "balance", "stateMutability" : "view" },
+	{ "type" : "function", "name" : "send", "inputs" : [ { "name" : "amount", "type" : "uint256" } ] },
+	{ "type" : "function", "name" : "test", "inputs" : [ { "name" : "number", "type" : "uint32" } ] },
+	{ "type" : "function", "name" : "string", "inputs" : [ { "name" : "inputs", "type" : "string" } ] },
+	{ "type" : "function", "name" : "bool", "inputs" : [ { "name" : "inputs", "type" : "bool" } ] },
+	{ "type" : "function", "name" : "address", "inputs" : [ { "name" : "inputs", "type" : "address" } ] },
+	{ "type" : "function", "name" : "uint64[2]", "inputs" : [ { "name" : "inputs", "type" : "uint64[2]" } ] },
+	{ "type" : "function", "name" : "uint64[]", "inputs" : [ { "name" : "inputs", "type" : "uint64[]" } ] },
+	{ "type" : "function", "name" : "int8", "inputs" : [ { "name" : "inputs", "type" : "int8" } ] },
+	{ "type" : "function", "name" : "foo", "inputs" : [ { "name" : "inputs", "type" : "uint32" } ] },
+	{ "type" : "function", "name" : "bar", "inputs" : [ { "name" : "inputs", "type" : "uint32" }, { "name" : "string", "type" : "uint16" } ] },
+	{ "type" : "function", "name" : "slice", "inputs" : [ { "name" : "inputs", "type" : "uint32[2]" } ] },
+	{ "type" : "function", "name" : "slice256", "inputs" : [ { "name" : "inputs", "type" : "uint256[2]" } ] },
+	{ "type" : "function", "name" : "sliceAddress", "inputs" : [ { "name" : "inputs", "type" : "address[]" } ] },
+	{ "type" : "function", "name" : "sliceMultiAddress", "inputs" : [ { "name" : "a", "type" : "address[]" }, { "name" : "b", "type" : "address[]" } ] },
+	{ "type" : "function", "name" : "nestedArray", "inputs" : [ { "name" : "a", "type" : "uint256[2][2]" }, { "name" : "b", "type" : "address[]" } ] },
+	{ "type" : "function", "name" : "nestedArray2", "inputs" : [ { "name" : "a", "type" : "uint8[][2]" } ] },
+	{ "type" : "function", "name" : "nestedSlice", "inputs" : [ { "name" : "a", "type" : "uint8[][]" } ] },
+	{ "type" : "function", "name" : "receive", "inputs" : [ { "name" : "memo", "type" : "bytes" }], "outputs" : [], "payable" : true, "stateMutability" : "payable" },
+	{ "type" : "function", "name" : "fixedArrStr", "stateMutability" : "view", "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr", "type" : "uint256[2]" } ] },
+	{ "type" : "function", "name" : "fixedArrBytes", "stateMutability" : "view", "inputs" : [ { "name" : "bytes", "type" : "bytes" }, { "name" : "fixedArr", "type" : "uint256[2]" } ] },
+	{ "type" : "function", "name" : "mixedArrStr", "stateMutability" : "view", "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr", "type" : "uint256[2]" }, { "name" : "dynArr", "type" : "uint256[]" } ] },
+	{ "type" : "function", "name" : "doubleFixedArrStr", "stateMutability" : "view", "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr1", "type" : "uint256[2]" }, { "name" : "fixedArr2", "type" : "uint256[3]" } ] },
+	{ "type" : "function", "name" : "multipleMixedArrStr", "stateMutability" : "view", "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr1", "type" : "uint256[2]" }, { "name" : "dynArr", "type" : "uint256[]" }, { "name" : "fixedArr2", "type" : "uint256[3]" } ] },
+	{ "type" : "function", "name" : "overloadedNames", "stateMutability" : "view", "inputs": [ { "components": [ { "internalType": "uint256", "name": "_f",	"type": "uint256" }, { "internalType": "uint256", "name": "__f", "type": "uint256"}, { "internalType": "uint256", "name": "f", "type": "uint256"}],"internalType": "struct Overloader.F", "name": "f","type": "tuple"}]}
 ]`

-const jsondata2 = `
-[
-	{ "type" : "function", "name" : "balance", "constant" : true },
-	{ "type" : "function", "name" : "send", "constant" : false, "inputs" : [ { "name" : "amount", "type" : "uint256" } ] },
-	{ "type" : "function", "name" : "test", "constant" : false, "inputs" : [ { "name" : "number", "type" : "uint32" } ] },
-	{ "type" : "function", "name" : "string", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "string" } ] },
-	{ "type" : "function", "name" : "bool", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "bool" } ] },
-	{ "type" : "function", "name" : "address", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "address" } ] },
-	{ "type" : "function", "name" : "uint64[2]", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint64[2]" } ] },
-	{ "type" : "function", "name" : "uint64[]", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint64[]" } ] },
-	{ "type" : "function", "name" : "foo", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32" } ] },
-	{ "type" : "function", "name" : "bar", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32" }, { "name" : "string", "type" : "uint16" } ] },
-	{ "type" : "function", "name" : "slice", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32[2]" } ] },
-	{ "type" : "function", "name" : "slice256", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint256[2]" } ] },
-	{ "type" : "function", "name" : "sliceAddress", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "address[]" } ] },
-	{ "type" : "function", "name" : "sliceMultiAddress", "constant" : false, "inputs" : [ { "name" : "a", "type" : "address[]" }, { "name" : "b", "type" : "address[]" } ] },
-	{ "type" : "function", "name" : "nestedArray", "constant" : false, "inputs" : [ { "name" : "a", "type" : "uint256[2][2]" }, { "name" : "b", "type" : "address[]" } ] },
-	{ "type" : "function", "name" : "nestedArray2", "constant" : false, "inputs" : [ { "name" : "a", "type" : "uint8[][2]" } ] },
-	{ "type" : "function", "name" : "nestedSlice", "constant" : false, "inputs" : [ { "name" : "a", "type" : "uint8[][]" } ] }
-]`
+var (
+	Uint256, _    = NewType("uint256", "", nil)
+	Uint32, _     = NewType("uint32", "", nil)
+	Uint16, _     = NewType("uint16", "", nil)
+	String, _     = NewType("string", "", nil)
+	Bool, _       = NewType("bool", "", nil)
+	Bytes, _      = NewType("bytes", "", nil)
+	Address, _    = NewType("address", "", nil)
+	Uint64Arr, _  = NewType("uint64[]", "", nil)
+	AddressArr, _ = NewType("address[]", "", nil)
+	Int8, _       = NewType("int8", "", nil)
+	// Special types for testing
+	Uint32Arr2, _       = NewType("uint32[2]", "", nil)
+	Uint64Arr2, _       = NewType("uint64[2]", "", nil)
+	Uint256Arr, _       = NewType("uint256[]", "", nil)
+	Uint256Arr2, _      = NewType("uint256[2]", "", nil)
+	Uint256Arr3, _      = NewType("uint256[3]", "", nil)
+	Uint256ArrNested, _ = NewType("uint256[2][2]", "", nil)
+	Uint8ArrNested, _   = NewType("uint8[][2]", "", nil)
+	Uint8SliceNested, _ = NewType("uint8[][]", "", nil)
+	TupleF, _           = NewType("tuple", "struct Overloader.F", []ArgumentMarshaling{
+		{Name: "_f", Type: "uint256"},
+		{Name: "__f", Type: "uint256"},
+		{Name: "f", Type: "uint256"}})
+)
+
+var methods = map[string]Method{
+	"":                    NewMethod("", "", Function, "view", false, false, nil, nil),
+	"balance":             NewMethod("balance", "balance", Function, "view", false, false, nil, nil),
+	"send":                NewMethod("send", "send", Function, "", false, false, []Argument{{"amount", Uint256, false}}, nil),
+	"test":                NewMethod("test", "test", Function, "", false, false, []Argument{{"number", Uint32, false}}, nil),
+	"string":              NewMethod("string", "string", Function, "", false, false, []Argument{{"inputs", String, false}}, nil),
+	"bool":                NewMethod("bool", "bool", Function, "", false, false, []Argument{{"inputs", Bool, false}}, nil),
+	"address":             NewMethod("address", "address", Function, "", false, false, []Argument{{"inputs", Address, false}}, nil),
+	"uint64[]":            NewMethod("uint64[]", "uint64[]", Function, "", false, false, []Argument{{"inputs", Uint64Arr, false}}, nil),
+	"uint64[2]":           NewMethod("uint64[2]", "uint64[2]", Function, "", false, false, []Argument{{"inputs", Uint64Arr2, false}}, nil),
+	"int8":                NewMethod("int8", "int8", Function, "", false, false, []Argument{{"inputs", Int8, false}}, nil),
+	"foo":                 NewMethod("foo", "foo", Function, "", false, false, []Argument{{"inputs", Uint32, false}}, nil),
+	"bar":                 NewMethod("bar", "bar", Function, "", false, false, []Argument{{"inputs", Uint32, false}, {"string", Uint16, false}}, nil),
+	"slice":               NewMethod("slice", "slice", Function, "", false, false, []Argument{{"inputs", Uint32Arr2, false}}, nil),
+	"slice256":            NewMethod("slice256", "slice256", Function, "", false, false, []Argument{{"inputs", Uint256Arr2, false}}, nil),
+	"sliceAddress":        NewMethod("sliceAddress", "sliceAddress", Function, "", false, false, []Argument{{"inputs", AddressArr, false}}, nil),
+	"sliceMultiAddress":   NewMethod("sliceMultiAddress", "sliceMultiAddress", Function, "", false, false, []Argument{{"a", AddressArr, false}, {"b", AddressArr, false}}, nil),
+	"nestedArray":         NewMethod("nestedArray", "nestedArray", Function, "", false, false, []Argument{{"a", Uint256ArrNested, false}, {"b", AddressArr, false}}, nil),
+	"nestedArray2":        NewMethod("nestedArray2", "nestedArray2", Function, "", false, false, []Argument{{"a", Uint8ArrNested, false}}, nil),
+	"nestedSlice":         NewMethod("nestedSlice", "nestedSlice", Function, "", false, false, []Argument{{"a", Uint8SliceNested, false}}, nil),
+	"receive":             NewMethod("receive", "receive", Function, "payable", false, true, []Argument{{"memo", Bytes, false}}, []Argument{}),
+	"fixedArrStr":         NewMethod("fixedArrStr", "fixedArrStr", Function, "view", false, false, []Argument{{"str", String, false}, {"fixedArr", Uint256Arr2, false}}, nil),
+	"fixedArrBytes":       NewMethod("fixedArrBytes", "fixedArrBytes", Function, "view", false, false, []Argument{{"bytes", Bytes, false}, {"fixedArr", Uint256Arr2, false}}, nil),
+	"mixedArrStr":         NewMethod("mixedArrStr", "mixedArrStr", Function, "view", false, false, []Argument{{"str", String, false}, {"fixedArr", Uint256Arr2, false}, {"dynArr", Uint256Arr, false}}, nil),
+	"doubleFixedArrStr":   NewMethod("doubleFixedArrStr", "doubleFixedArrStr", Function, "view", false, false, []Argument{{"str", String, false}, {"fixedArr1", Uint256Arr2, false}, {"fixedArr2", Uint256Arr3, false}}, nil),
+	"multipleMixedArrStr": NewMethod("multipleMixedArrStr", "multipleMixedArrStr", Function, "view", false, false, []Argument{{"str", String, false}, {"fixedArr1", Uint256Arr2, false}, {"dynArr", Uint256Arr, false}, {"fixedArr2", Uint256Arr3, false}}, nil),
+	"overloadedNames":     NewMethod("overloadedNames", "overloadedNames", Function, "view", false, false, []Argument{{"f", TupleF, false}}, nil),
+}

 func TestReader(t *testing.T) {
-	Uint256, _ := NewType("uint256", "", nil)
-	exp := ABI{
-		Methods: map[string]Method{
-			"balance": {
-				"balance", "balance", true, nil, nil,
-			},
-			"send": {
-				"send", "send", false, []Argument{
-					{"amount", Uint256, false},
-				}, nil,
-			},
-		},
+	abi := ABI{
+		Methods: methods,
 	}

-	abi, err := JSON(strings.NewReader(jsondata))
+	exp, err := JSON(strings.NewReader(jsondata))
 	if err != nil {
-		t.Error(err)
+		t.Fatal(err)
 	}

-	// deep equal fails for some reason
 	for name, expM := range exp.Methods {
 		gotM, exist := abi.Methods[name]
 		if !exist {
@@ -98,8 +147,58 @@ func TestReader(t *testing.T) {
 	}
 }

+func TestInvalidABI(t *testing.T) {
+	json := `[{ "type" : "function", "name" : "", "constant" : fals }]`
+	_, err := JSON(strings.NewReader(json))
+	if err == nil {
+		t.Fatal("invalid json should produce error")
+	}
+	json2 := `[{ "type" : "function", "name" : "send", "constant" : false, "inputs" : [ { "name" : "amount", "typ" : "uint256" } ] }]`
+	_, err = JSON(strings.NewReader(json2))
+	if err == nil {
+		t.Fatal("invalid json should produce error")
+	}
+}
+
+// TestConstructor tests a constructor function.
+// The test is based on the following contract:
+// 	contract TestConstructor {
+// 		constructor(uint256 a, uint256 b) public{}
+//	}
+func TestConstructor(t *testing.T) {
+	json := `[{	"inputs": [{"internalType": "uint256","name": "a","type": "uint256"	},{	"internalType": "uint256","name": "b","type": "uint256"}],"stateMutability": "nonpayable","type": "constructor"}]`
+	method := NewMethod("", "", Constructor, "nonpayable", false, false, []Argument{{"a", Uint256, false}, {"b", Uint256, false}}, nil)
+	// Test from JSON
+	abi, err := JSON(strings.NewReader(json))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(abi.Constructor, method) {
+		t.Error("Missing expected constructor")
+	}
+	// Test pack/unpack
+	packed, err := abi.Pack("", big.NewInt(1), big.NewInt(2))
+	if err != nil {
+		t.Error(err)
+	}
+	v := struct {
+		A *big.Int
+		B *big.Int
+	}{new(big.Int), new(big.Int)}
+	//abi.Unpack(&v, "", packed)
+	if err := abi.Constructor.Inputs.Unpack(&v, packed); err != nil {
+		t.Error(err)
+	}
+	if !reflect.DeepEqual(v.A, big.NewInt(1)) {
+		t.Error("Unable to pack/unpack from constructor")
+	}
+	if !reflect.DeepEqual(v.B, big.NewInt(2)) {
+		t.Error("Unable to pack/unpack from constructor")
+	}
+}
+
 func TestTestNumbers(t *testing.T) {
-	abi, err := JSON(strings.NewReader(jsondata2))
+	abi, err := JSON(strings.NewReader(jsondata))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -135,60 +234,22 @@ func TestTestNumbers(t *testing.T) {
 	}
 }

-func TestTestString(t *testing.T) {
-	abi, err := JSON(strings.NewReader(jsondata2))
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if _, err := abi.Pack("string", "hello world"); err != nil {
-		t.Error(err)
-	}
-}
-
-func TestTestBool(t *testing.T) {
-	abi, err := JSON(strings.NewReader(jsondata2))
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if _, err := abi.Pack("bool", true); err != nil {
-		t.Error(err)
-	}
-}
-
-func TestTestSlice(t *testing.T) {
-	abi, err := JSON(strings.NewReader(jsondata2))
-	if err != nil {
-		t.Fatal(err)
-	}
-	slice := make([]uint64, 2)
-	if _, err := abi.Pack("uint64[2]", slice); err != nil {
-		t.Error(err)
-	}
-	if _, err := abi.Pack("uint64[]", slice); err != nil {
-		t.Error(err)
-	}
-}
-
 func TestMethodSignature(t *testing.T) {
-	String, _ := NewType("string", "", nil)
-	m := Method{"foo", "foo", false, []Argument{{"bar", String, false}, {"baz", String, false}}, nil}
+	m := NewMethod("foo", "foo", Function, "", false, false, []Argument{{"bar", String, false}, {"baz", String, false}}, nil)
 	exp := "foo(string,string)"
-	if m.Sig() != exp {
-		t.Error("signature mismatch", exp, "!=", m.Sig())
+	if m.Sig != exp {
+		t.Error("signature mismatch", exp, "!=", m.Sig)
 	}

 	idexp := crypto.Keccak256([]byte(exp))[:4]
-	if !bytes.Equal(m.ID(), idexp) {
-		t.Errorf("expected ids to match %x != %x", m.ID(), idexp)
+	if !bytes.Equal(m.ID, idexp) {
+		t.Errorf("expected ids to match %x != %x", m.ID, idexp)
 	}

-	uintt, _ := NewType("uint256", "", nil)
-	m = Method{"foo", "foo", false, []Argument{{"bar", uintt, false}}, nil}
+	m = NewMethod("foo", "foo", Function, "", false, false, []Argument{{"bar", Uint256, false}}, nil)
 	exp = "foo(uint256)"
-	if m.Sig() != exp {
-		t.Error("signature mismatch", exp, "!=", m.Sig())
+	if m.Sig != exp {
+		t.Error("signature mismatch", exp, "!=", m.Sig)
 	}

 	// Method with tuple arguments
@@ -204,10 +265,10 @@ func TestMethodSignature(t *testing.T) {
 			{Name: "y", Type: "int256"},
 		}},
 	})
-	m = Method{"foo", "foo", false, []Argument{{"s", s, false}, {"bar", String, false}}, nil}
+	m = NewMethod("foo", "foo", Function, "", false, false, []Argument{{"s", s, false}, {"bar", String, false}}, nil)
 	exp = "foo((int256,int256[],(int256,int256)[],(int256,int256)[2]),string)"
-	if m.Sig() != exp {
-		t.Error("signature mismatch", exp, "!=", m.Sig())
+	if m.Sig != exp {
+		t.Error("signature mismatch", exp, "!=", m.Sig)
 	}
 }

@@ -219,12 +280,12 @@ func TestOverloadedMethodSignature(t *testing.T) {
 	}
 	check := func(name string, expect string, method bool) {
 		if method {
-			if abi.Methods[name].Sig() != expect {
-				t.Fatalf("The signature of overloaded method mismatch, want %s, have %s", expect, abi.Methods[name].Sig())
+			if abi.Methods[name].Sig != expect {
+				t.Fatalf("The signature of overloaded method mismatch, want %s, have %s", expect, abi.Methods[name].Sig)
 			}
 		} else {
-			if abi.Events[name].Sig() != expect {
-				t.Fatalf("The signature of overloaded event mismatch, want %s, have %s", expect, abi.Events[name].Sig())
+			if abi.Events[name].Sig != expect {
+				t.Fatalf("The signature of overloaded event mismatch, want %s, have %s", expect, abi.Events[name].Sig)
 			}
 		}
 	}
@@ -235,7 +296,7 @@ func TestOverloadedMethodSignature(t *testing.T) {
 }

 func TestMultiPack(t *testing.T) {
-	abi, err := JSON(strings.NewReader(jsondata2))
+	abi, err := JSON(strings.NewReader(jsondata))
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -400,15 +461,7 @@ func TestInputVariableInputLength(t *testing.T) {
 }

 func TestInputFixedArrayAndVariableInputLength(t *testing.T) {
-	const definition = `[
-	{ "type" : "function", "name" : "fixedArrStr", "constant" : true, "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr", "type" : "uint256[2]" } ] },
-	{ "type" : "function", "name" : "fixedArrBytes", "constant" : true, "inputs" : [ { "name" : "str", "type" : "bytes" }, { "name" : "fixedArr", "type" : "uint256[2]" } ] },
-    { "type" : "function", "name" : "mixedArrStr", "constant" : true, "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr", "type": "uint256[2]" }, { "name" : "dynArr", "type": "uint256[]" } ] },
-    { "type" : "function", "name" : "doubleFixedArrStr", "constant" : true, "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr1", "type": "uint256[2]" }, { "name" : "fixedArr2", "type": "uint256[3]" } ] },
-    { "type" : "function", "name" : "multipleMixedArrStr", "constant" : true, "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr1", "type": "uint256[2]" }, { "name" : "dynArr", "type" : "uint256[]" }, { "name" : "fixedArr2", "type" : "uint256[3]" } ] }
-	]`
-
-	abi, err := JSON(strings.NewReader(definition))
+	abi, err := JSON(strings.NewReader(jsondata))
 	if err != nil {
 		t.Error(err)
 	}
@@ -555,7 +608,7 @@ func TestInputFixedArrayAndVariableInputLength(t *testing.T) {
 	strvalue = common.RightPadBytes([]byte(strin), 32)
 	fixedarrin1value1 = common.LeftPadBytes(fixedarrin1[0].Bytes(), 32)
 	fixedarrin1value2 = common.LeftPadBytes(fixedarrin1[1].Bytes(), 32)
-	dynarroffset = U256(big.NewInt(int64(256 + ((len(strin)/32)+1)*32)))
+	dynarroffset = math.U256Bytes(big.NewInt(int64(256 + ((len(strin)/32)+1)*32)))
 	dynarrlength = make([]byte, 32)
 	dynarrlength[31] = byte(len(dynarrin))
 	dynarrinvalue1 = common.LeftPadBytes(dynarrin[0].Bytes(), 32)
@@ -582,7 +635,7 @@ func TestInputFixedArrayAndVariableInputLength(t *testing.T) {
 }

 func TestDefaultFunctionParsing(t *testing.T) {
-	const definition = `[{ "name" : "balance" }]`
+	const definition = `[{ "name" : "balance", "type" : "function" }]`

 	abi, err := JSON(strings.NewReader(definition))
 	if err != nil {
@@ -602,8 +655,6 @@ func TestBareEvents(t *testing.T) {
 	{ "type" : "event", "name" : "tuple", "inputs" : [{ "indexed":false, "name":"t", "type":"tuple", "components":[{"name":"a", "type":"uint256"}] }, { "indexed":true, "name":"arg1", "type":"address" }] }
 	]`

-	arg0, _ := NewType("uint256", "", nil)
-	arg1, _ := NewType("address", "", nil)
 	tuple, _ := NewType("tuple", "", []ArgumentMarshaling{{Name: "a", Type: "uint256"}})

 	expectedEvents := map[string]struct {
@@ -613,12 +664,12 @@ func TestBareEvents(t *testing.T) {
 		"balance": {false, nil},
 		"anon":    {true, nil},
 		"args": {false, []Argument{
-			{Name: "arg0", Type: arg0, Indexed: false},
-			{Name: "arg1", Type: arg1, Indexed: true},
+			{Name: "arg0", Type: Uint256, Indexed: false},
+			{Name: "arg1", Type: Address, Indexed: true},
 		}},
 		"tuple": {false, []Argument{
 			{Name: "t", Type: tuple, Indexed: false},
-			{Name: "arg1", Type: arg1, Indexed: true},
+			{Name: "arg1", Type: Address, Indexed: true},
 		}},
 	}

@@ -891,45 +942,25 @@ func TestUnpackIntoMapNamingConflict(t *testing.T) {
 }

 func TestABI_MethodById(t *testing.T) {
-	const abiJSON = `[
-		{"type":"function","name":"receive","constant":false,"inputs":[{"name":"memo","type":"bytes"}],"outputs":[],"payable":true,"stateMutability":"payable"},
-		{"type":"event","name":"received","anonymous":false,"inputs":[{"indexed":false,"name":"sender","type":"address"},{"indexed":false,"name":"amount","type":"uint256"},{"indexed":false,"name":"memo","type":"bytes"}]},
-		{"type":"function","name":"fixedArrStr","constant":true,"inputs":[{"name":"str","type":"string"},{"name":"fixedArr","type":"uint256[2]"}]},
-		{"type":"function","name":"fixedArrBytes","constant":true,"inputs":[{"name":"str","type":"bytes"},{"name":"fixedArr","type":"uint256[2]"}]},
-		{"type":"function","name":"mixedArrStr","constant":true,"inputs":[{"name":"str","type":"string"},{"name":"fixedArr","type":"uint256[2]"},{"name":"dynArr","type":"uint256[]"}]},
-		{"type":"function","name":"doubleFixedArrStr","constant":true,"inputs":[{"name":"str","type":"string"},{"name":"fixedArr1","type":"uint256[2]"},{"name":"fixedArr2","type":"uint256[3]"}]},
-		{"type":"function","name":"multipleMixedArrStr","constant":true,"inputs":[{"name":"str","type":"string"},{"name":"fixedArr1","type":"uint256[2]"},{"name":"dynArr","type":"uint256[]"},{"name":"fixedArr2","type":"uint256[3]"}]},
-		{"type":"function","name":"balance","constant":true},
-		{"type":"function","name":"send","constant":false,"inputs":[{"name":"amount","type":"uint256"}]},
-		{"type":"function","name":"test","constant":false,"inputs":[{"name":"number","type":"uint32"}]},
-		{"type":"function","name":"string","constant":false,"inputs":[{"name":"inputs","type":"string"}]},
-		{"type":"function","name":"bool","constant":false,"inputs":[{"name":"inputs","type":"bool"}]},
-		{"type":"function","name":"address","constant":false,"inputs":[{"name":"inputs","type":"address"}]},
-		{"type":"function","name":"uint64[2]","constant":false,"inputs":[{"name":"inputs","type":"uint64[2]"}]},
-		{"type":"function","name":"uint64[]","constant":false,"inputs":[{"name":"inputs","type":"uint64[]"}]},
-		{"type":"function","name":"foo","constant":false,"inputs":[{"name":"inputs","type":"uint32"}]},
-		{"type":"function","name":"bar","constant":false,"inputs":[{"name":"inputs","type":"uint32"},{"name":"string","type":"uint16"}]},
-		{"type":"function","name":"_slice","constant":false,"inputs":[{"name":"inputs","type":"uint32[2]"}]},
-		{"type":"function","name":"__slice256","constant":false,"inputs":[{"name":"inputs","type":"uint256[2]"}]},
-		{"type":"function","name":"sliceAddress","constant":false,"inputs":[{"name":"inputs","type":"address[]"}]},
-		{"type":"function","name":"sliceMultiAddress","constant":false,"inputs":[{"name":"a","type":"address[]"},{"name":"b","type":"address[]"}]}
-	]
-`
-	abi, err := JSON(strings.NewReader(abiJSON))
+	abi, err := JSON(strings.NewReader(jsondata))
 	if err != nil {
 		t.Fatal(err)
 	}
 	for name, m := range abi.Methods {
 		a := fmt.Sprintf("%v", m)
-		m2, err := abi.MethodById(m.ID())
+		m2, err := abi.MethodById(m.ID)
 		if err != nil {
 			t.Fatalf("Failed to look up ABI method: %v", err)
 		}
 		b := fmt.Sprintf("%v", m2)
 		if a != b {
-			t.Errorf("Method %v (id %x) not 'findable' by id in ABI", name, m.ID())
+			t.Errorf("Method %v (id %x) not 'findable' by id in ABI", name, m.ID)
 		}
 	}
+	// test unsuccessful lookups
+	if _, err = abi.MethodById(crypto.Keccak256()); err == nil {
+		t.Error("Expected error: no method with this id")
+	}
 	// Also test empty
 	if _, err := abi.MethodById([]byte{0x00}); err == nil {
 		t.Errorf("Expected error, too short to decode data")
@@ -995,8 +1026,8 @@ func TestABI_EventById(t *testing.T) {
 			t.Errorf("We should find a event for topic %s, test #%d", topicID.Hex(), testnum)
 		}

-		if event.ID() != topicID {
-			t.Errorf("Event id %s does not match topic %s, test #%d", event.ID().Hex(), topicID.Hex(), testnum)
+		if event.ID != topicID {
+			t.Errorf("Event id %s does not match topic %s, test #%d", event.ID.Hex(), topicID.Hex(), testnum)
 		}

 		unknowntopicID := crypto.Keccak256Hash([]byte("unknownEvent"))
@@ -1010,26 +1041,6 @@ func TestABI_EventById(t *testing.T) {
 	}
 }

-func TestDuplicateMethodNames(t *testing.T) {
-	abiJSON := `[{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"value","type":"uint256"}],"name":"transfer","outputs":[{"name":"ok","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"value","type":"uint256"},{"name":"data","type":"bytes"}],"name":"transfer","outputs":[{"name":"ok","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"value","type":"uint256"},{"name":"data","type":"bytes"},{"name":"customFallback","type":"string"}],"name":"transfer","outputs":[{"name":"ok","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"}]`
-	contractAbi, err := JSON(strings.NewReader(abiJSON))
-	if err != nil {
-		t.Fatal(err)
-	}
-	if _, ok := contractAbi.Methods["transfer"]; !ok {
-		t.Fatalf("Could not find original method")
-	}
-	if _, ok := contractAbi.Methods["transfer0"]; !ok {
-		t.Fatalf("Could not find duplicate method")
-	}
-	if _, ok := contractAbi.Methods["transfer1"]; !ok {
-		t.Fatalf("Could not find duplicate method")
-	}
-	if _, ok := contractAbi.Methods["transfer2"]; ok {
-		t.Fatalf("Should not have found extra method")
-	}
-}
-
 // TestDoubleDuplicateMethodNames checks that if transfer0 already exists, there won't be a name
 // conflict and that the second transfer method will be renamed transfer1.
 func TestDoubleDuplicateMethodNames(t *testing.T) {
@@ -1051,3 +1062,87 @@ func TestDoubleDuplicateMethodNames(t *testing.T) {
 		t.Fatalf("Should not have found extra method")
 	}
 }
+
+// TestDoubleDuplicateEventNames checks that if send0 already exists, there won't be a name
+// conflict and that the second send event will be renamed send1.
+// The test runs the abi of the following contract.
+// 	contract DuplicateEvent {
+// 		event send(uint256 a);
+//		event send0();
+//		event send();
+//	}
+func TestDoubleDuplicateEventNames(t *testing.T) {
+	abiJSON := `[{"anonymous": false,"inputs": [{"indexed": false,"internalType": "uint256","name": "a","type": "uint256"}],"name": "send","type": "event"},{"anonymous": false,"inputs": [],"name": "send0","type": "event"},{	"anonymous": false,	"inputs": [],"name": "send","type": "event"}]`
+	contractAbi, err := JSON(strings.NewReader(abiJSON))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, ok := contractAbi.Events["send"]; !ok {
+		t.Fatalf("Could not find original event")
+	}
+	if _, ok := contractAbi.Events["send0"]; !ok {
+		t.Fatalf("Could not find duplicate event")
+	}
+	if _, ok := contractAbi.Events["send1"]; !ok {
+		t.Fatalf("Could not find duplicate event")
+	}
+	if _, ok := contractAbi.Events["send2"]; ok {
+		t.Fatalf("Should not have found extra event")
+	}
+}
+
+// TestUnnamedEventParam checks that an event with unnamed parameters is
+// correctly handled
+// The test runs the abi of the following contract.
+// 	contract TestEvent {
+//		event send(uint256, uint256);
+//	}
+func TestUnnamedEventParam(t *testing.T) {
+	abiJSON := `[{ "anonymous": false, "inputs": [{	"indexed": false,"internalType": "uint256",	"name": "","type": "uint256"},{"indexed": false,"internalType": "uint256","name": "","type": "uint256"}],"name": "send","type": "event"}]`
+	contractAbi, err := JSON(strings.NewReader(abiJSON))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	event, ok := contractAbi.Events["send"]
+	if !ok {
+		t.Fatalf("Could not find event")
+	}
+	if event.Inputs[0].Name != "arg0" {
+		t.Fatalf("Could not find input")
+	}
+	if event.Inputs[1].Name != "arg1" {
+		t.Fatalf("Could not find input")
+	}
+}
+
+func TestUnpackRevert(t *testing.T) {
+	t.Parallel()
+
+	var cases = []struct {
+		input     string
+		expect    string
+		expectErr error
+	}{
+		{"", "", errors.New("invalid data for unpacking")},
+		{"08c379a1", "", errors.New("invalid data for unpacking")},
+		{"08c379a00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000d72657665727420726561736f6e00000000000000000000000000000000000000", "revert reason", nil},
+	}
+	for index, c := range cases {
+		t.Run(fmt.Sprintf("case %d", index), func(t *testing.T) {
+			got, err := UnpackRevert(common.Hex2Bytes(c.input))
+			if c.expectErr != nil {
+				if err == nil {
+					t.Fatalf("Expected non-nil error")
+				}
+				if err.Error() != c.expectErr.Error() {
+					t.Fatalf("Expected error mismatch, want %v, got %v", c.expectErr, err)
+				}
+				return
+			}
+			if c.expect != got {
+				t.Fatalf("Output mismatch, want %v, got %v", c.expect, got)
+			}
+		})
+	}
+}
--- a/accounts/abi/argument.go
+++ b/accounts/abi/argument.go
@@ -59,18 +59,6 @@ func (argument *Argument) UnmarshalJSON(data []byte) error {
 	return nil
 }

-// LengthNonIndexed returns the number of arguments when not counting 'indexed' ones. Only events
-// can ever have 'indexed' arguments, it should always be false on arguments for method input/output
-func (arguments Arguments) LengthNonIndexed() int {
-	out := 0
-	for _, arg := range arguments {
-		if !arg.Indexed {
-			out++
-		}
-	}
-	return out
-}
-
 // NonIndexed returns the arguments with indexed arguments filtered out
 func (arguments Arguments) NonIndexed() Arguments {
 	var ret []Argument
@@ -92,9 +80,8 @@ func (arguments Arguments) Unpack(v interface{}, data []byte) error {
 	if len(data) == 0 {
 		if len(arguments) != 0 {
 			return fmt.Errorf("abi: attempting to unmarshall an empty string while arguments are expected")
-		} else {
-			return nil // Nothing to unmarshal, return
 		}
+		return nil // Nothing to unmarshal, return
 	}
 	// make sure the passed value is arguments pointer
 	if reflect.Ptr != reflect.ValueOf(v).Kind() {
@@ -104,6 +91,9 @@ func (arguments Arguments) Unpack(v interface{}, data []byte) error {
 	if err != nil {
 		return err
 	}
+	if len(marshalledValues) == 0 {
+		return fmt.Errorf("abi: Unpack(no-values unmarshalled %T)", v)
+	}
 	if arguments.isTuple() {
 		return arguments.unpackTuple(v, marshalledValues)
 	}
@@ -112,96 +102,20 @@ func (arguments Arguments) Unpack(v interface{}, data []byte) error {

 // UnpackIntoMap performs the operation hexdata -> mapping of argument name to argument value
 func (arguments Arguments) UnpackIntoMap(v map[string]interface{}, data []byte) error {
+	// Make sure map is not nil
+	if v == nil {
+		return fmt.Errorf("abi: cannot unpack into a nil map")
+	}
 	if len(data) == 0 {
 		if len(arguments) != 0 {
 			return fmt.Errorf("abi: attempting to unmarshall an empty string while arguments are expected")
-		} else {
-			return nil // Nothing to unmarshal, return
 		}
+		return nil // Nothing to unmarshal, return
 	}
 	marshalledValues, err := arguments.UnpackValues(data)
 	if err != nil {
 		return err
 	}
-	return arguments.unpackIntoMap(v, marshalledValues)
-}
-
-// unpack sets the unmarshalled value to go format.
-// Note the dst here must be settable.
-func unpack(t *Type, dst interface{}, src interface{}) error {
-	var (
-		dstVal = reflect.ValueOf(dst).Elem()
-		srcVal = reflect.ValueOf(src)
-	)
-	tuple, typ := false, t
-	for {
-		if typ.T == SliceTy || typ.T == ArrayTy {
-			typ = typ.Elem
-			continue
-		}
-		tuple = typ.T == TupleTy
-		break
-	}
-	if !tuple {
-		return set(dstVal, srcVal)
-	}
-
-	// Dereferences interface or pointer wrapper
-	dstVal = indirectInterfaceOrPtr(dstVal)
-
-	switch t.T {
-	case TupleTy:
-		if dstVal.Kind() != reflect.Struct {
-			return fmt.Errorf("abi: invalid dst value for unpack, want struct, got %s", dstVal.Kind())
-		}
-		fieldmap, err := mapArgNamesToStructFields(t.TupleRawNames, dstVal)
-		if err != nil {
-			return err
-		}
-		for i, elem := range t.TupleElems {
-			fname := fieldmap[t.TupleRawNames[i]]
-			field := dstVal.FieldByName(fname)
-			if !field.IsValid() {
-				return fmt.Errorf("abi: field %s can't found in the given value", t.TupleRawNames[i])
-			}
-			if err := unpack(elem, field.Addr().Interface(), srcVal.Field(i).Interface()); err != nil {
-				return err
-			}
-		}
-		return nil
-	case SliceTy:
-		if dstVal.Kind() != reflect.Slice {
-			return fmt.Errorf("abi: invalid dst value for unpack, want slice, got %s", dstVal.Kind())
-		}
-		slice := reflect.MakeSlice(dstVal.Type(), srcVal.Len(), srcVal.Len())
-		for i := 0; i < slice.Len(); i++ {
-			if err := unpack(t.Elem, slice.Index(i).Addr().Interface(), srcVal.Index(i).Interface()); err != nil {
-				return err
-			}
-		}
-		dstVal.Set(slice)
-	case ArrayTy:
-		if dstVal.Kind() != reflect.Array {
-			return fmt.Errorf("abi: invalid dst value for unpack, want array, got %s", dstVal.Kind())
-		}
-		array := reflect.New(dstVal.Type()).Elem()
-		for i := 0; i < array.Len(); i++ {
-			if err := unpack(t.Elem, array.Index(i).Addr().Interface(), srcVal.Index(i).Interface()); err != nil {
-				return err
-			}
-		}
-		dstVal.Set(array)
-	}
-	return nil
-}
-
-// unpackIntoMap unpacks marshalledValues into the provided map[string]interface{}
-func (arguments Arguments) unpackIntoMap(v map[string]interface{}, marshalledValues []interface{}) error {
-	// Make sure map is not nil
-	if v == nil {
-		return fmt.Errorf("abi: cannot unpack into a nil map")
-	}
-
 	for i, arg := range arguments.NonIndexed() {
 		v[arg.Name] = marshalledValues[i]
 	}
@@ -210,88 +124,63 @@ func (arguments Arguments) unpackIntoMap(v map[string]interface{}, marshalledVal

 // unpackAtomic unpacks ( hexdata -> go ) a single value
 func (arguments Arguments) unpackAtomic(v interface{}, marshalledValues interface{}) error {
-	if arguments.LengthNonIndexed() == 0 {
-		return nil
-	}
-	argument := arguments.NonIndexed()[0]
-	elem := reflect.ValueOf(v).Elem()
+	dst := reflect.ValueOf(v).Elem()
+	src := reflect.ValueOf(marshalledValues)

-	if elem.Kind() == reflect.Struct && argument.Type.T != TupleTy {
-		fieldmap, err := mapArgNamesToStructFields([]string{argument.Name}, elem)
-		if err != nil {
-			return err
-		}
-		field := elem.FieldByName(fieldmap[argument.Name])
-		if !field.IsValid() {
-			return fmt.Errorf("abi: field %s can't be found in the given value", argument.Name)
-		}
-		return unpack(&argument.Type, field.Addr().Interface(), marshalledValues)
+	if dst.Kind() == reflect.Struct && src.Kind() != reflect.Struct {
+		return set(dst.Field(0), src)
 	}
-	return unpack(&argument.Type, elem.Addr().Interface(), marshalledValues)
+	return set(dst, src)
 }

 // unpackTuple unpacks ( hexdata -> go ) a batch of values.
 func (arguments Arguments) unpackTuple(v interface{}, marshalledValues []interface{}) error {
-	var (
-		value = reflect.ValueOf(v).Elem()
-		typ   = value.Type()
-		kind  = value.Kind()
-	)
-	if err := requireUnpackKind(value, typ, kind, arguments); err != nil {
-		return err
-	}
+	value := reflect.ValueOf(v).Elem()
+	nonIndexedArgs := arguments.NonIndexed()

-	// If the interface is a struct, get of abi->struct_field mapping
-	var abi2struct map[string]string
-	if kind == reflect.Struct {
-		var (
-			argNames []string
-			err      error
-		)
-		for _, arg := range arguments.NonIndexed() {
-			argNames = append(argNames, arg.Name)
+	switch value.Kind() {
+	case reflect.Struct:
+		argNames := make([]string, len(nonIndexedArgs))
+		for i, arg := range nonIndexedArgs {
+			argNames[i] = arg.Name
 		}
-		abi2struct, err = mapArgNamesToStructFields(argNames, value)
+		var err error
+		abi2struct, err := mapArgNamesToStructFields(argNames, value)
 		if err != nil {
 			return err
 		}
-	}
-	for i, arg := range arguments.NonIndexed() {
-		switch kind {
-		case reflect.Struct:
+		for i, arg := range nonIndexedArgs {
 			field := value.FieldByName(abi2struct[arg.Name])
 			if !field.IsValid() {
 				return fmt.Errorf("abi: field %s can't be found in the given value", arg.Name)
 			}
-			if err := unpack(&arg.Type, field.Addr().Interface(), marshalledValues[i]); err != nil {
+			if err := set(field, reflect.ValueOf(marshalledValues[i])); err != nil {
 				return err
 			}
-		case reflect.Slice, reflect.Array:
-			if value.Len() < i {
-				return fmt.Errorf("abi: insufficient number of arguments for unpack, want %d, got %d", len(arguments), value.Len())
-			}
-			v := value.Index(i)
-			if err := requireAssignable(v, reflect.ValueOf(marshalledValues[i])); err != nil {
-				return err
-			}
-			if err := unpack(&arg.Type, v.Addr().Interface(), marshalledValues[i]); err != nil {
-				return err
-			}
-		default:
-			return fmt.Errorf("abi:[2] cannot unmarshal tuple in to %v", typ)
 		}
+	case reflect.Slice, reflect.Array:
+		if value.Len() < len(marshalledValues) {
+			return fmt.Errorf("abi: insufficient number of arguments for unpack, want %d, got %d", len(arguments), value.Len())
+		}
+		for i := range nonIndexedArgs {
+			if err := set(value.Index(i), reflect.ValueOf(marshalledValues[i])); err != nil {
+				return err
+			}
+		}
+	default:
+		return fmt.Errorf("abi:[2] cannot unmarshal tuple in to %v", value.Type())
 	}
 	return nil
-
 }

 // UnpackValues can be used to unpack ABI-encoded hexdata according to the ABI-specification,
 // without supplying a struct to unpack into. Instead, this method returns a list containing the
 // values. An atomic argument will be a list with one element.
 func (arguments Arguments) UnpackValues(data []byte) ([]interface{}, error) {
-	retval := make([]interface{}, 0, arguments.LengthNonIndexed())
+	nonIndexedArgs := arguments.NonIndexed()
+	retval := make([]interface{}, 0, len(nonIndexedArgs))
 	virtualArgs := 0
-	for index, arg := range arguments.NonIndexed() {
+	for index, arg := range nonIndexedArgs {
 		marshalledValue, err := toGoType((index+virtualArgs)*32, arg.Type, data)
 		if arg.Type.T == ArrayTy && !isDynamicType(arg.Type) {
 			// If we have a static array, like [3]uint256, these are coded as
@@ -329,7 +218,7 @@ func (arguments Arguments) Pack(args ...interface{}) ([]byte, error) {
 	// Make sure arguments match up and pack them
 	abiArgs := arguments
 	if len(args) != len(abiArgs) {
-		return nil, fmt.Errorf("argument count mismatch: %d for %d", len(args), len(abiArgs))
+		return nil, fmt.Errorf("argument count mismatch: got %d for %d", len(args), len(abiArgs))
 	}
 	// variable input is the output appended at the end of packed
 	// output. This is used for strings and bytes types input.
--- a/accounts/abi/bind/backends/simulated.go
+++ b/accounts/abi/bind/backends/simulated.go
@@ -25,8 +25,10 @@ import (
 	"time"

 	"github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum/accounts/abi"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/common/math"
 	"github.com/ethereum/go-ethereum/consensus/ethash"
 	"github.com/ethereum/go-ethereum/core"
@@ -38,6 +40,7 @@ import (
 	"github.com/ethereum/go-ethereum/eth/filters"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/event"
+	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rpc"
 )
@@ -46,19 +49,23 @@ import (
 var _ bind.ContractBackend = (*SimulatedBackend)(nil)

 var (
-	errBlockNumberUnsupported = errors.New("simulatedBackend cannot access blocks other than the latest block")
-	errGasEstimationFailed    = errors.New("gas required exceeds allowance or always failing transaction")
+	errBlockNumberUnsupported  = errors.New("simulatedBackend cannot access blocks other than the latest block")
+	errBlockDoesNotExist       = errors.New("block does not exist in blockchain")
+	errTransactionDoesNotExist = errors.New("transaction does not exist")
 )

 // SimulatedBackend implements bind.ContractBackend, simulating a blockchain in
 // the background. Its main purpose is to allow easily testing contract bindings.
+// Simulated backend implements the following interfaces:
+// ChainReader, ChainStateReader, ContractBackend, ContractCaller, ContractFilterer, ContractTransactor,
+// DeployBackend, GasEstimator, GasPricer, LogFilterer, PendingContractCaller, TransactionReader, and TransactionSender
 type SimulatedBackend struct {
 	database   ethdb.Database   // In memory database to store our testing data
 	blockchain *core.BlockChain // Ethereum blockchain to handle the consensus

 	mu           sync.Mutex
 	pendingBlock *types.Block   // Currently pending block that will be imported on request
-	pendingState *state.StateDB // Currently pending state that will be the active on on request
+	pendingState *state.StateDB // Currently pending state that will be the active on request

 	events *filters.EventSystem // Event system for filtering log events live

@@ -70,13 +77,13 @@ type SimulatedBackend struct {
 func NewSimulatedBackendWithDatabase(database ethdb.Database, alloc core.GenesisAlloc, gasLimit uint64) *SimulatedBackend {
 	genesis := core.Genesis{Config: params.AllEthashProtocolChanges, GasLimit: gasLimit, Alloc: alloc}
 	genesis.MustCommit(database)
-	blockchain, _ := core.NewBlockChain(database, nil, genesis.Config, ethash.NewFaker(), vm.Config{}, nil)
+	blockchain, _ := core.NewBlockChain(database, nil, genesis.Config, ethash.NewFaker(), vm.Config{}, nil, nil)

 	backend := &SimulatedBackend{
 		database:   database,
 		blockchain: blockchain,
 		config:     genesis.Config,
-		events:     filters.NewEventSystem(new(event.TypeMux), &filterBackend{database, blockchain}, false),
+		events:     filters.NewEventSystem(&filterBackend{database, blockchain}, false),
 	}
 	backend.rollback()
 	return backend
@@ -119,7 +126,19 @@ func (b *SimulatedBackend) rollback() {
 	statedb, _ := b.blockchain.State()

 	b.pendingBlock = blocks[0]
-	b.pendingState, _ = state.New(b.pendingBlock.Root(), statedb.Database())
+	b.pendingState, _ = state.New(b.pendingBlock.Root(), statedb.Database(), nil)
+}
+
+// stateByBlockNumber retrieves a state by a given blocknumber.
+func (b *SimulatedBackend) stateByBlockNumber(ctx context.Context, blockNumber *big.Int) (*state.StateDB, error) {
+	if blockNumber == nil || blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) == 0 {
+		return b.blockchain.State()
+	}
+	block, err := b.blockByNumberNoLock(ctx, blockNumber)
+	if err != nil {
+		return nil, err
+	}
+	return b.blockchain.StateAt(block.Root())
 }

 // CodeAt returns the code associated with a certain account in the blockchain.
@@ -127,10 +146,11 @@ func (b *SimulatedBackend) CodeAt(ctx context.Context, contract common.Address,
 	b.mu.Lock()
 	defer b.mu.Unlock()

-	if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 {
-		return nil, errBlockNumberUnsupported
+	statedb, err := b.stateByBlockNumber(ctx, blockNumber)
+	if err != nil {
+		return nil, err
 	}
-	statedb, _ := b.blockchain.State()
+
 	return statedb.GetCode(contract), nil
 }

@@ -139,10 +159,11 @@ func (b *SimulatedBackend) BalanceAt(ctx context.Context, contract common.Addres
 	b.mu.Lock()
 	defer b.mu.Unlock()

-	if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 {
-		return nil, errBlockNumberUnsupported
+	statedb, err := b.stateByBlockNumber(ctx, blockNumber)
+	if err != nil {
+		return nil, err
 	}
-	statedb, _ := b.blockchain.State()
+
 	return statedb.GetBalance(contract), nil
 }

@@ -151,10 +172,11 @@ func (b *SimulatedBackend) NonceAt(ctx context.Context, contract common.Address,
 	b.mu.Lock()
 	defer b.mu.Unlock()

-	if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 {
-		return 0, errBlockNumberUnsupported
+	statedb, err := b.stateByBlockNumber(ctx, blockNumber)
+	if err != nil {
+		return 0, err
 	}
-	statedb, _ := b.blockchain.State()
+
 	return statedb.GetNonce(contract), nil
 }

@@ -163,16 +185,20 @@ func (b *SimulatedBackend) StorageAt(ctx context.Context, contract common.Addres
 	b.mu.Lock()
 	defer b.mu.Unlock()

-	if blockNumber != nil && blockNumber.Cmp(b.blockchain.CurrentBlock().Number()) != 0 {
-		return nil, errBlockNumberUnsupported
+	statedb, err := b.stateByBlockNumber(ctx, blockNumber)
+	if err != nil {
+		return nil, err
 	}
-	statedb, _ := b.blockchain.State()
+
 	val := statedb.GetState(contract, key)
 	return val[:], nil
 }

 // TransactionReceipt returns the receipt of a transaction.
 func (b *SimulatedBackend) TransactionReceipt(ctx context.Context, txHash common.Hash) (*types.Receipt, error) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
 	receipt, _, _, _ := rawdb.ReadReceipt(b.database, txHash, b.config)
 	return receipt, nil
 }
@@ -196,6 +222,121 @@ func (b *SimulatedBackend) TransactionByHash(ctx context.Context, txHash common.
 	return nil, false, ethereum.NotFound
 }

+// BlockByHash retrieves a block based on the block hash
+func (b *SimulatedBackend) BlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	if hash == b.pendingBlock.Hash() {
+		return b.pendingBlock, nil
+	}
+
+	block := b.blockchain.GetBlockByHash(hash)
+	if block != nil {
+		return block, nil
+	}
+
+	return nil, errBlockDoesNotExist
+}
+
+// BlockByNumber retrieves a block from the database by number, caching it
+// (associated with its hash) if found.
+func (b *SimulatedBackend) BlockByNumber(ctx context.Context, number *big.Int) (*types.Block, error) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	return b.blockByNumberNoLock(ctx, number)
+}
+
+// blockByNumberNoLock retrieves a block from the database by number, caching it
+// (associated with its hash) if found without Lock.
+func (b *SimulatedBackend) blockByNumberNoLock(ctx context.Context, number *big.Int) (*types.Block, error) {
+	if number == nil || number.Cmp(b.pendingBlock.Number()) == 0 {
+		return b.blockchain.CurrentBlock(), nil
+	}
+
+	block := b.blockchain.GetBlockByNumber(uint64(number.Int64()))
+	if block == nil {
+		return nil, errBlockDoesNotExist
+	}
+
+	return block, nil
+}
+
+// HeaderByHash returns a block header from the current canonical chain.
+func (b *SimulatedBackend) HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	if hash == b.pendingBlock.Hash() {
+		return b.pendingBlock.Header(), nil
+	}
+
+	header := b.blockchain.GetHeaderByHash(hash)
+	if header == nil {
+		return nil, errBlockDoesNotExist
+	}
+
+	return header, nil
+}
+
+// HeaderByNumber returns a block header from the current canonical chain. If number is
+// nil, the latest known header is returned.
+func (b *SimulatedBackend) HeaderByNumber(ctx context.Context, block *big.Int) (*types.Header, error) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	if block == nil || block.Cmp(b.pendingBlock.Number()) == 0 {
+		return b.blockchain.CurrentHeader(), nil
+	}
+
+	return b.blockchain.GetHeaderByNumber(uint64(block.Int64())), nil
+}
+
+// TransactionCount returns the number of transactions in a given block
+func (b *SimulatedBackend) TransactionCount(ctx context.Context, blockHash common.Hash) (uint, error) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	if blockHash == b.pendingBlock.Hash() {
+		return uint(b.pendingBlock.Transactions().Len()), nil
+	}
+
+	block := b.blockchain.GetBlockByHash(blockHash)
+	if block == nil {
+		return uint(0), errBlockDoesNotExist
+	}
+
+	return uint(block.Transactions().Len()), nil
+}
+
+// TransactionInBlock returns the transaction for a specific block at a specific index
+func (b *SimulatedBackend) TransactionInBlock(ctx context.Context, blockHash common.Hash, index uint) (*types.Transaction, error) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	if blockHash == b.pendingBlock.Hash() {
+		transactions := b.pendingBlock.Transactions()
+		if uint(len(transactions)) < index+1 {
+			return nil, errTransactionDoesNotExist
+		}
+
+		return transactions[index], nil
+	}
+
+	block := b.blockchain.GetBlockByHash(blockHash)
+	if block == nil {
+		return nil, errBlockDoesNotExist
+	}
+
+	transactions := block.Transactions()
+	if uint(len(transactions)) < index+1 {
+		return nil, errTransactionDoesNotExist
+	}
+
+	return transactions[index], nil
+}
+
 // PendingCodeAt returns the code associated with an account in the pending state.
 func (b *SimulatedBackend) PendingCodeAt(ctx context.Context, contract common.Address) ([]byte, error) {
 	b.mu.Lock()
@@ -204,6 +345,36 @@ func (b *SimulatedBackend) PendingCodeAt(ctx context.Context, contract common.Ad
 	return b.pendingState.GetCode(contract), nil
 }

+func newRevertError(result *core.ExecutionResult) *revertError {
+	reason, errUnpack := abi.UnpackRevert(result.Revert())
+	err := errors.New("execution reverted")
+	if errUnpack == nil {
+		err = fmt.Errorf("execution reverted: %v", reason)
+	}
+	return &revertError{
+		error:  err,
+		reason: hexutil.Encode(result.Revert()),
+	}
+}
+
+// revertError is an API error that encompassas an EVM revertal with JSON error
+// code and a binary data blob.
+type revertError struct {
+	error
+	reason string // revert reason hex encoded
+}
+
+// ErrorCode returns the JSON error code for a revertal.
+// See: https://github.com/ethereum/wiki/wiki/JSON-RPC-Error-Codes-Improvement-Proposal
+func (e *revertError) ErrorCode() int {
+	return 3
+}
+
+// ErrorData returns the hex encoded revert reason.
+func (e *revertError) ErrorData() interface{} {
+	return e.reason
+}
+
 // CallContract executes a contract call.
 func (b *SimulatedBackend) CallContract(ctx context.Context, call ethereum.CallMsg, blockNumber *big.Int) ([]byte, error) {
 	b.mu.Lock()
@@ -216,8 +387,15 @@ func (b *SimulatedBackend) CallContract(ctx context.Context, call ethereum.CallM
 	if err != nil {
 		return nil, err
 	}
-	rval, _, _, err := b.callContract(ctx, call, b.blockchain.CurrentBlock(), state)
-	return rval, err
+	res, err := b.callContract(ctx, call, b.blockchain.CurrentBlock(), state)
+	if err != nil {
+		return nil, err
+	}
+	// If the result contains a revert reason, try to unpack and return it.
+	if len(res.Revert()) > 0 {
+		return nil, newRevertError(res)
+	}
+	return res.Return(), res.Err
 }

 // PendingCallContract executes a contract call on the pending state.
@@ -226,8 +404,15 @@ func (b *SimulatedBackend) PendingCallContract(ctx context.Context, call ethereu
 	defer b.mu.Unlock()
 	defer b.pendingState.RevertToSnapshot(b.pendingState.Snapshot())

-	rval, _, _, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState)
-	return rval, err
+	res, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState)
+	if err != nil {
+		return nil, err
+	}
+	// If the result contains a revert reason, try to unpack and return it.
+	if len(res.Revert()) > 0 {
+		return nil, newRevertError(res)
+	}
+	return res.Return(), res.Err
 }

 // PendingNonceAt implements PendingStateReader.PendingNonceAt, retrieving
@@ -262,25 +447,57 @@ func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMs
 	} else {
 		hi = b.pendingBlock.GasLimit()
 	}
+	// Recap the highest gas allowance with account's balance.
+	if call.GasPrice != nil && call.GasPrice.BitLen() != 0 {
+		balance := b.pendingState.GetBalance(call.From) // from can't be nil
+		available := new(big.Int).Set(balance)
+		if call.Value != nil {
+			if call.Value.Cmp(available) >= 0 {
+				return 0, errors.New("insufficient funds for transfer")
+			}
+			available.Sub(available, call.Value)
+		}
+		allowance := new(big.Int).Div(available, call.GasPrice)
+		if allowance.IsUint64() && hi > allowance.Uint64() {
+			transfer := call.Value
+			if transfer == nil {
+				transfer = new(big.Int)
+			}
+			log.Warn("Gas estimation capped by limited funds", "original", hi, "balance", balance,
+				"sent", transfer, "gasprice", call.GasPrice, "fundable", allowance)
+			hi = allowance.Uint64()
+		}
+	}
 	cap = hi

 	// Create a helper to check if a gas allowance results in an executable transaction
-	executable := func(gas uint64) bool {
+	executable := func(gas uint64) (bool, *core.ExecutionResult, error) {
 		call.Gas = gas

 		snapshot := b.pendingState.Snapshot()
-		_, _, failed, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState)
+		res, err := b.callContract(ctx, call, b.pendingBlock, b.pendingState)
 		b.pendingState.RevertToSnapshot(snapshot)

-		if err != nil || failed {
-			return false
+		if err != nil {
+			if err == core.ErrIntrinsicGas {
+				return true, nil, nil // Special case, raise gas limit
+			}
+			return true, nil, err // Bail out
 		}
-		return true
+		return res.Failed(), res, nil
 	}
 	// Execute the binary search and hone in on an executable gas limit
 	for lo+1 < hi {
 		mid := (hi + lo) / 2
-		if !executable(mid) {
+		failed, _, err := executable(mid)
+
+		// If the error is not nil(consensus error), it means the provided message
+		// call or transaction will never be accepted no matter how much gas it is
+		// assigned. Return the error directly, don't struggle any more
+		if err != nil {
+			return 0, err
+		}
+		if failed {
 			lo = mid
 		} else {
 			hi = mid
@@ -288,8 +505,19 @@ func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMs
 	}
 	// Reject the transaction as invalid if it still fails at the highest allowance
 	if hi == cap {
-		if !executable(hi) {
-			return 0, errGasEstimationFailed
+		failed, result, err := executable(hi)
+		if err != nil {
+			return 0, err
+		}
+		if failed {
+			if result != nil && result.Err != vm.ErrOutOfGas {
+				if len(result.Revert()) > 0 {
+					return 0, newRevertError(result)
+				}
+				return 0, result.Err
+			}
+			// Otherwise, the specified gas cap is too low
+			return 0, fmt.Errorf("gas required exceeds allowance (%d)", cap)
 		}
 	}
 	return hi, nil
@@ -297,7 +525,7 @@ func (b *SimulatedBackend) EstimateGas(ctx context.Context, call ethereum.CallMs

 // callContract implements common code between normal and pending contract calls.
 // state is modified during execution, make sure to copy it if necessary.
-func (b *SimulatedBackend) callContract(ctx context.Context, call ethereum.CallMsg, block *types.Block, statedb *state.StateDB) ([]byte, uint64, bool, error) {
+func (b *SimulatedBackend) callContract(ctx context.Context, call ethereum.CallMsg, block *types.Block, statedb *state.StateDB) (*core.ExecutionResult, error) {
 	// Ensure message is initialized properly.
 	if call.GasPrice == nil {
 		call.GasPrice = big.NewInt(1)
@@ -347,7 +575,7 @@ func (b *SimulatedBackend) SendTransaction(ctx context.Context, tx *types.Transa
 	statedb, _ := b.blockchain.State()

 	b.pendingBlock = blocks[0]
-	b.pendingState, _ = state.New(b.pendingBlock.Root(), statedb.Database())
+	b.pendingState, _ = state.New(b.pendingBlock.Root(), statedb.Database(), nil)
 	return nil
 }

@@ -419,10 +647,38 @@ func (b *SimulatedBackend) SubscribeFilterLogs(ctx context.Context, query ethere
 	}), nil
 }

+// SubscribeNewHead returns an event subscription for a new header
+func (b *SimulatedBackend) SubscribeNewHead(ctx context.Context, ch chan<- *types.Header) (ethereum.Subscription, error) {
+	// subscribe to a new head
+	sink := make(chan *types.Header)
+	sub := b.events.SubscribeNewHeads(sink)
+
+	return event.NewSubscription(func(quit <-chan struct{}) error {
+		defer sub.Unsubscribe()
+		for {
+			select {
+			case head := <-sink:
+				select {
+				case ch <- head:
+				case err := <-sub.Err():
+					return err
+				case <-quit:
+					return nil
+				}
+			case err := <-sub.Err():
+				return err
+			case <-quit:
+				return nil
+			}
+		}
+	}), nil
+}
+
 // AdjustTime adds a time shift to the simulated clock.
 func (b *SimulatedBackend) AdjustTime(adjustment time.Duration) error {
 	b.mu.Lock()
 	defer b.mu.Unlock()
+
 	blocks, _ := core.GenerateChain(b.config, b.blockchain.CurrentBlock(), ethash.NewFaker(), b.database, 1, func(number int, block *core.BlockGen) {
 		for _, tx := range b.pendingBlock.Transactions() {
 			block.AddTx(tx)
@@ -432,7 +688,7 @@ func (b *SimulatedBackend) AdjustTime(adjustment time.Duration) error {
 	statedb, _ := b.blockchain.State()

 	b.pendingBlock = blocks[0]
-	b.pendingState, _ = state.New(b.pendingBlock.Root(), statedb.Database())
+	b.pendingState, _ = state.New(b.pendingBlock.Root(), statedb.Database(), nil)

 	return nil
 }
@@ -502,22 +758,34 @@ func (fb *filterBackend) GetLogs(ctx context.Context, hash common.Hash) ([][]*ty
 }

 func (fb *filterBackend) SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription {
+	return nullSubscription()
+}
+
+func (fb *filterBackend) SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription {
+	return fb.bc.SubscribeChainEvent(ch)
+}
+
+func (fb *filterBackend) SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription {
+	return fb.bc.SubscribeRemovedLogsEvent(ch)
+}
+
+func (fb *filterBackend) SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription {
+	return fb.bc.SubscribeLogsEvent(ch)
+}
+
+func (fb *filterBackend) SubscribePendingLogsEvent(ch chan<- []*types.Log) event.Subscription {
+	return nullSubscription()
+}
+
+func (fb *filterBackend) BloomStatus() (uint64, uint64) { return 4096, 0 }
+
+func (fb *filterBackend) ServiceFilter(ctx context.Context, ms *bloombits.MatcherSession) {
+	panic("not supported")
+}
+
+func nullSubscription() event.Subscription {
 	return event.NewSubscription(func(quit <-chan struct{}) error {
 		<-quit
 		return nil
 	})
 }
-func (fb *filterBackend) SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription {
-	return fb.bc.SubscribeChainEvent(ch)
-}
-func (fb *filterBackend) SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription {
-	return fb.bc.SubscribeRemovedLogsEvent(ch)
-}
-func (fb *filterBackend) SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription {
-	return fb.bc.SubscribeLogsEvent(ch)
-}
-
-func (fb *filterBackend) BloomStatus() (uint64, uint64) { return 4096, 0 }
-func (fb *filterBackend) ServiceFilter(ctx context.Context, ms *bloombits.MatcherSession) {
-	panic("not supported")
-}
--- a/accounts/abi/bind/backends/simulated_test.go
+++ b/accounts/abi/bind/backends/simulated_test.go
--- a/accounts/abi/bind/base.go
+++ b/accounts/abi/bind/base.go
@@ -49,7 +49,7 @@ type TransactOpts struct {
 	Nonce  *big.Int       // Nonce to use for the transaction execution (nil = use pending state)
 	Signer SignerFn       // Method to use for signing the transaction (mandatory)

-	Value    *big.Int // Funds to transfer along along the transaction (nil = 0 = no funds)
+	Value    *big.Int // Funds to transfer along the transaction (nil = 0 = no funds)
 	GasPrice *big.Int // Gas price to use for the transaction execution (nil = gas price oracle)
 	GasLimit uint64   // Gas limit to set for the transaction execution (0 = estimate)

@@ -171,12 +171,24 @@ func (c *BoundContract) Transact(opts *TransactOpts, method string, params ...in
 	if err != nil {
 		return nil, err
 	}
+	// todo(rjl493456442) check the method is payable or not,
+	// reject invalid transaction at the first place
 	return c.transact(opts, &c.address, input)
 }

+// RawTransact initiates a transaction with the given raw calldata as the input.
+// It's usually used to initiates transaction for invoking **Fallback** function.
+func (c *BoundContract) RawTransact(opts *TransactOpts, calldata []byte) (*types.Transaction, error) {
+	// todo(rjl493456442) check the method is payable or not,
+	// reject invalid transaction at the first place
+	return c.transact(opts, &c.address, calldata)
+}
+
 // Transfer initiates a plain transaction to move funds to the contract, calling
 // its default method if one is available.
 func (c *BoundContract) Transfer(opts *TransactOpts) (*types.Transaction, error) {
+	// todo(rjl493456442) check the payable fallback or receive is defined
+	// or not, reject invalid transaction at the first place
 	return c.transact(opts, &c.address, nil)
 }

@@ -252,9 +264,9 @@ func (c *BoundContract) FilterLogs(opts *FilterOpts, name string, query ...[]int
 		opts = new(FilterOpts)
 	}
 	// Append the event selector to the query parameters and construct the topic set
-	query = append([][]interface{}{{c.abi.Events[name].ID()}}, query...)
+	query = append([][]interface{}{{c.abi.Events[name].ID}}, query...)

-	topics, err := makeTopics(query...)
+	topics, err := abi.MakeTopics(query...)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -301,9 +313,9 @@ func (c *BoundContract) WatchLogs(opts *WatchOpts, name string, query ...[]inter
 		opts = new(WatchOpts)
 	}
 	// Append the event selector to the query parameters and construct the topic set
-	query = append([][]interface{}{{c.abi.Events[name].ID()}}, query...)
+	query = append([][]interface{}{{c.abi.Events[name].ID}}, query...)

-	topics, err := makeTopics(query...)
+	topics, err := abi.MakeTopics(query...)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -337,7 +349,7 @@ func (c *BoundContract) UnpackLog(out interface{}, event string, log types.Log)
 			indexed = append(indexed, arg)
 		}
 	}
-	return parseTopics(out, indexed, log.Topics[1:])
+	return abi.ParseTopics(out, indexed, log.Topics[1:])
 }

 // UnpackLogIntoMap unpacks a retrieved log into the provided map.
@@ -353,7 +365,7 @@ func (c *BoundContract) UnpackLogIntoMap(out map[string]interface{}, event strin
 			indexed = append(indexed, arg)
 		}
 	}
-	return parseTopicsIntoMap(out, indexed, log.Topics[1:])
+	return abi.ParseTopicsIntoMap(out, indexed, log.Topics[1:])
 }

 // ensureContext is a helper method to ensure a context is not nil, even if the
--- a/accounts/abi/bind/base_test.go
+++ b/accounts/abi/bind/base_test.go
@@ -17,9 +17,9 @@
 package bind_test

 import (
-	"bytes"
 	"context"
 	"math/big"
+	"reflect"
 	"strings"
 	"testing"

@@ -34,8 +34,10 @@ import (
 )

 type mockCaller struct {
-	codeAtBlockNumber       *big.Int
-	callContractBlockNumber *big.Int
+	codeAtBlockNumber         *big.Int
+	callContractBlockNumber   *big.Int
+	pendingCodeAtCalled       bool
+	pendingCallContractCalled bool
 }

 func (mc *mockCaller) CodeAt(ctx context.Context, contract common.Address, blockNumber *big.Int) ([]byte, error) {
@@ -47,6 +49,16 @@ func (mc *mockCaller) CallContract(ctx context.Context, call ethereum.CallMsg, b
 	mc.callContractBlockNumber = blockNumber
 	return nil, nil
 }
+
+func (mc *mockCaller) PendingCodeAt(ctx context.Context, contract common.Address) ([]byte, error) {
+	mc.pendingCodeAtCalled = true
+	return nil, nil
+}
+
+func (mc *mockCaller) PendingCallContract(ctx context.Context, call ethereum.CallMsg) ([]byte, error) {
+	mc.pendingCallContractCalled = true
+	return nil, nil
+}
 func TestPassingBlockNumber(t *testing.T) {

 	mc := &mockCaller{}
@@ -82,57 +94,39 @@ func TestPassingBlockNumber(t *testing.T) {
 	if mc.codeAtBlockNumber != nil {
 		t.Fatalf("CodeAt() was passed a block number when it should not have been")
 	}
+
+	bc.Call(&bind.CallOpts{BlockNumber: blockNumber, Pending: true}, &ret, "something")
+
+	if !mc.pendingCallContractCalled {
+		t.Fatalf("CallContract() was not passed the block number")
+	}
+
+	if !mc.pendingCodeAtCalled {
+		t.Fatalf("CodeAt() was not passed the block number")
+	}
 }

 const hexData = "0x000000000000000000000000376c47978271565f56deb45495afa69e59c16ab200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000000158"

 func TestUnpackIndexedStringTyLogIntoMap(t *testing.T) {
 	hash := crypto.Keccak256Hash([]byte("testName"))
-	mockLog := types.Log{
-		Address: common.HexToAddress("0x0"),
-		Topics: []common.Hash{
-			common.HexToHash("0x0"),
-			hash,
-		},
-		Data:        hexutil.MustDecode(hexData),
-		BlockNumber: uint64(26),
-		TxHash:      common.HexToHash("0x0"),
-		TxIndex:     111,
-		BlockHash:   common.BytesToHash([]byte{1, 2, 3, 4, 5}),
-		Index:       7,
-		Removed:     false,
+	topics := []common.Hash{
+		common.HexToHash("0x0"),
+		hash,
 	}
+	mockLog := newMockLog(topics, common.HexToHash("0x0"))

 	abiString := `[{"anonymous":false,"inputs":[{"indexed":true,"name":"name","type":"string"},{"indexed":false,"name":"sender","type":"address"},{"indexed":false,"name":"amount","type":"uint256"},{"indexed":false,"name":"memo","type":"bytes"}],"name":"received","type":"event"}]`
 	parsedAbi, _ := abi.JSON(strings.NewReader(abiString))
 	bc := bind.NewBoundContract(common.HexToAddress("0x0"), parsedAbi, nil, nil, nil)

-	receivedMap := make(map[string]interface{})
 	expectedReceivedMap := map[string]interface{}{
 		"name":   hash,
 		"sender": common.HexToAddress("0x376c47978271565f56DEB45495afa69E59c16Ab2"),
 		"amount": big.NewInt(1),
 		"memo":   []byte{88},
 	}
-	if err := bc.UnpackLogIntoMap(receivedMap, "received", mockLog); err != nil {
-		t.Error(err)
-	}
-
-	if len(receivedMap) != 4 {
-		t.Fatal("unpacked map expected to have length 4")
-	}
-	if receivedMap["name"] != expectedReceivedMap["name"] {
-		t.Error("unpacked map does not match expected map")
-	}
-	if receivedMap["sender"] != expectedReceivedMap["sender"] {
-		t.Error("unpacked map does not match expected map")
-	}
-	if receivedMap["amount"].(*big.Int).Cmp(expectedReceivedMap["amount"].(*big.Int)) != 0 {
-		t.Error("unpacked map does not match expected map")
-	}
-	if !bytes.Equal(receivedMap["memo"].([]byte), expectedReceivedMap["memo"].([]byte)) {
-		t.Error("unpacked map does not match expected map")
-	}
+	unpackAndCheck(t, bc, expectedReceivedMap, mockLog)
 }

 func TestUnpackIndexedSliceTyLogIntoMap(t *testing.T) {
@@ -141,51 +135,23 @@ func TestUnpackIndexedSliceTyLogIntoMap(t *testing.T) {
 		t.Fatal(err)
 	}
 	hash := crypto.Keccak256Hash(sliceBytes)
-	mockLog := types.Log{
-		Address: common.HexToAddress("0x0"),
-		Topics: []common.Hash{
-			common.HexToHash("0x0"),
-			hash,
-		},
-		Data:        hexutil.MustDecode(hexData),
-		BlockNumber: uint64(26),
-		TxHash:      common.HexToHash("0x0"),
-		TxIndex:     111,
-		BlockHash:   common.BytesToHash([]byte{1, 2, 3, 4, 5}),
-		Index:       7,
-		Removed:     false,
+	topics := []common.Hash{
+		common.HexToHash("0x0"),
+		hash,
 	}
+	mockLog := newMockLog(topics, common.HexToHash("0x0"))

 	abiString := `[{"anonymous":false,"inputs":[{"indexed":true,"name":"names","type":"string[]"},{"indexed":false,"name":"sender","type":"address"},{"indexed":false,"name":"amount","type":"uint256"},{"indexed":false,"name":"memo","type":"bytes"}],"name":"received","type":"event"}]`
 	parsedAbi, _ := abi.JSON(strings.NewReader(abiString))
 	bc := bind.NewBoundContract(common.HexToAddress("0x0"), parsedAbi, nil, nil, nil)

-	receivedMap := make(map[string]interface{})
 	expectedReceivedMap := map[string]interface{}{
 		"names":  hash,
 		"sender": common.HexToAddress("0x376c47978271565f56DEB45495afa69E59c16Ab2"),
 		"amount": big.NewInt(1),
 		"memo":   []byte{88},
 	}
-	if err := bc.UnpackLogIntoMap(receivedMap, "received", mockLog); err != nil {
-		t.Error(err)
-	}
-
-	if len(receivedMap) != 4 {
-		t.Fatal("unpacked map expected to have length 4")
-	}
-	if receivedMap["names"] != expectedReceivedMap["names"] {
-		t.Error("unpacked map does not match expected map")
-	}
-	if receivedMap["sender"] != expectedReceivedMap["sender"] {
-		t.Error("unpacked map does not match expected map")
-	}
-	if receivedMap["amount"].(*big.Int).Cmp(expectedReceivedMap["amount"].(*big.Int)) != 0 {
-		t.Error("unpacked map does not match expected map")
-	}
-	if !bytes.Equal(receivedMap["memo"].([]byte), expectedReceivedMap["memo"].([]byte)) {
-		t.Error("unpacked map does not match expected map")
-	}
+	unpackAndCheck(t, bc, expectedReceivedMap, mockLog)
 }

 func TestUnpackIndexedArrayTyLogIntoMap(t *testing.T) {
@@ -194,51 +160,23 @@ func TestUnpackIndexedArrayTyLogIntoMap(t *testing.T) {
 		t.Fatal(err)
 	}
 	hash := crypto.Keccak256Hash(arrBytes)
-	mockLog := types.Log{
-		Address: common.HexToAddress("0x0"),
-		Topics: []common.Hash{
-			common.HexToHash("0x0"),
-			hash,
-		},
-		Data:        hexutil.MustDecode(hexData),
-		BlockNumber: uint64(26),
-		TxHash:      common.HexToHash("0x0"),
-		TxIndex:     111,
-		BlockHash:   common.BytesToHash([]byte{1, 2, 3, 4, 5}),
-		Index:       7,
-		Removed:     false,
+	topics := []common.Hash{
+		common.HexToHash("0x0"),
+		hash,
 	}
+	mockLog := newMockLog(topics, common.HexToHash("0x0"))

 	abiString := `[{"anonymous":false,"inputs":[{"indexed":true,"name":"addresses","type":"address[2]"},{"indexed":false,"name":"sender","type":"address"},{"indexed":false,"name":"amount","type":"uint256"},{"indexed":false,"name":"memo","type":"bytes"}],"name":"received","type":"event"}]`
 	parsedAbi, _ := abi.JSON(strings.NewReader(abiString))
 	bc := bind.NewBoundContract(common.HexToAddress("0x0"), parsedAbi, nil, nil, nil)

-	receivedMap := make(map[string]interface{})
 	expectedReceivedMap := map[string]interface{}{
 		"addresses": hash,
 		"sender":    common.HexToAddress("0x376c47978271565f56DEB45495afa69E59c16Ab2"),
 		"amount":    big.NewInt(1),
 		"memo":      []byte{88},
 	}
-	if err := bc.UnpackLogIntoMap(receivedMap, "received", mockLog); err != nil {
-		t.Error(err)
-	}
-
-	if len(receivedMap) != 4 {
-		t.Fatal("unpacked map expected to have length 4")
-	}
-	if receivedMap["addresses"] != expectedReceivedMap["addresses"] {
-		t.Error("unpacked map does not match expected map")
-	}
-	if receivedMap["sender"] != expectedReceivedMap["sender"] {
-		t.Error("unpacked map does not match expected map")
-	}
-	if receivedMap["amount"].(*big.Int).Cmp(expectedReceivedMap["amount"].(*big.Int)) != 0 {
-		t.Error("unpacked map does not match expected map")
-	}
-	if !bytes.Equal(receivedMap["memo"].([]byte), expectedReceivedMap["memo"].([]byte)) {
-		t.Error("unpacked map does not match expected map")
-	}
+	unpackAndCheck(t, bc, expectedReceivedMap, mockLog)
 }

 func TestUnpackIndexedFuncTyLogIntoMap(t *testing.T) {
@@ -249,99 +187,72 @@ func TestUnpackIndexedFuncTyLogIntoMap(t *testing.T) {
 	functionTyBytes := append(addrBytes, functionSelector...)
 	var functionTy [24]byte
 	copy(functionTy[:], functionTyBytes[0:24])
-	mockLog := types.Log{
-		Address: common.HexToAddress("0x0"),
-		Topics: []common.Hash{
-			common.HexToHash("0x99b5620489b6ef926d4518936cfec15d305452712b88bd59da2d9c10fb0953e8"),
-			common.BytesToHash(functionTyBytes),
-		},
-		Data:        hexutil.MustDecode(hexData),
-		BlockNumber: uint64(26),
-		TxHash:      common.HexToHash("0x5c698f13940a2153440c6d19660878bc90219d9298fdcf37365aa8d88d40fc42"),
-		TxIndex:     111,
-		BlockHash:   common.BytesToHash([]byte{1, 2, 3, 4, 5}),
-		Index:       7,
-		Removed:     false,
+	topics := []common.Hash{
+		common.HexToHash("0x99b5620489b6ef926d4518936cfec15d305452712b88bd59da2d9c10fb0953e8"),
+		common.BytesToHash(functionTyBytes),
 	}
-
+	mockLog := newMockLog(topics, common.HexToHash("0x5c698f13940a2153440c6d19660878bc90219d9298fdcf37365aa8d88d40fc42"))
 	abiString := `[{"anonymous":false,"inputs":[{"indexed":true,"name":"function","type":"function"},{"indexed":false,"name":"sender","type":"address"},{"indexed":false,"name":"amount","type":"uint256"},{"indexed":false,"name":"memo","type":"bytes"}],"name":"received","type":"event"}]`
 	parsedAbi, _ := abi.JSON(strings.NewReader(abiString))
 	bc := bind.NewBoundContract(common.HexToAddress("0x0"), parsedAbi, nil, nil, nil)

-	receivedMap := make(map[string]interface{})
 	expectedReceivedMap := map[string]interface{}{
 		"function": functionTy,
 		"sender":   common.HexToAddress("0x376c47978271565f56DEB45495afa69E59c16Ab2"),
 		"amount":   big.NewInt(1),
 		"memo":     []byte{88},
 	}
-	if err := bc.UnpackLogIntoMap(receivedMap, "received", mockLog); err != nil {
-		t.Error(err)
-	}
-
-	if len(receivedMap) != 4 {
-		t.Fatal("unpacked map expected to have length 4")
-	}
-	if receivedMap["function"] != expectedReceivedMap["function"] {
-		t.Error("unpacked map does not match expected map")
-	}
-	if receivedMap["sender"] != expectedReceivedMap["sender"] {
-		t.Error("unpacked map does not match expected map")
-	}
-	if receivedMap["amount"].(*big.Int).Cmp(expectedReceivedMap["amount"].(*big.Int)) != 0 {
-		t.Error("unpacked map does not match expected map")
-	}
-	if !bytes.Equal(receivedMap["memo"].([]byte), expectedReceivedMap["memo"].([]byte)) {
-		t.Error("unpacked map does not match expected map")
-	}
+	unpackAndCheck(t, bc, expectedReceivedMap, mockLog)
 }

 func TestUnpackIndexedBytesTyLogIntoMap(t *testing.T) {
-	byts := []byte{1, 2, 3, 4, 5}
-	hash := crypto.Keccak256Hash(byts)
-	mockLog := types.Log{
-		Address: common.HexToAddress("0x0"),
-		Topics: []common.Hash{
-			common.HexToHash("0x99b5620489b6ef926d4518936cfec15d305452712b88bd59da2d9c10fb0953e8"),
-			hash,
-		},
-		Data:        hexutil.MustDecode(hexData),
-		BlockNumber: uint64(26),
-		TxHash:      common.HexToHash("0x5c698f13940a2153440c6d19660878bc90219d9298fdcf37365aa8d88d40fc42"),
-		TxIndex:     111,
-		BlockHash:   common.BytesToHash([]byte{1, 2, 3, 4, 5}),
-		Index:       7,
-		Removed:     false,
+	bytes := []byte{1, 2, 3, 4, 5}
+	hash := crypto.Keccak256Hash(bytes)
+	topics := []common.Hash{
+		common.HexToHash("0x99b5620489b6ef926d4518936cfec15d305452712b88bd59da2d9c10fb0953e8"),
+		hash,
 	}
+	mockLog := newMockLog(topics, common.HexToHash("0x5c698f13940a2153440c6d19660878bc90219d9298fdcf37365aa8d88d40fc42"))

 	abiString := `[{"anonymous":false,"inputs":[{"indexed":true,"name":"content","type":"bytes"},{"indexed":false,"name":"sender","type":"address"},{"indexed":false,"name":"amount","type":"uint256"},{"indexed":false,"name":"memo","type":"bytes"}],"name":"received","type":"event"}]`
 	parsedAbi, _ := abi.JSON(strings.NewReader(abiString))
 	bc := bind.NewBoundContract(common.HexToAddress("0x0"), parsedAbi, nil, nil, nil)

-	receivedMap := make(map[string]interface{})
 	expectedReceivedMap := map[string]interface{}{
 		"content": hash,
 		"sender":  common.HexToAddress("0x376c47978271565f56DEB45495afa69E59c16Ab2"),
 		"amount":  big.NewInt(1),
 		"memo":    []byte{88},
 	}
-	if err := bc.UnpackLogIntoMap(receivedMap, "received", mockLog); err != nil {
+	unpackAndCheck(t, bc, expectedReceivedMap, mockLog)
+}
+
+func unpackAndCheck(t *testing.T, bc *bind.BoundContract, expected map[string]interface{}, mockLog types.Log) {
+	received := make(map[string]interface{})
+	if err := bc.UnpackLogIntoMap(received, "received", mockLog); err != nil {
 		t.Error(err)
 	}

-	if len(receivedMap) != 4 {
-		t.Fatal("unpacked map expected to have length 4")
+	if len(received) != len(expected) {
+		t.Fatalf("unpacked map length %v not equal expected length of %v", len(received), len(expected))
 	}
-	if receivedMap["content"] != expectedReceivedMap["content"] {
-		t.Error("unpacked map does not match expected map")
-	}
-	if receivedMap["sender"] != expectedReceivedMap["sender"] {
-		t.Error("unpacked map does not match expected map")
-	}
-	if receivedMap["amount"].(*big.Int).Cmp(expectedReceivedMap["amount"].(*big.Int)) != 0 {
-		t.Error("unpacked map does not match expected map")
-	}
-	if !bytes.Equal(receivedMap["memo"].([]byte), expectedReceivedMap["memo"].([]byte)) {
-		t.Error("unpacked map does not match expected map")
+	for name, elem := range expected {
+		if !reflect.DeepEqual(elem, received[name]) {
+			t.Errorf("field %v does not match expected, want %v, got %v", name, elem, received[name])
+		}
+	}
+}
+
+func newMockLog(topics []common.Hash, txHash common.Hash) types.Log {
+	return types.Log{
+		Address:     common.HexToAddress("0x0"),
+		Topics:      topics,
+		Data:        hexutil.MustDecode(hexData),
+		BlockNumber: uint64(26),
+		TxHash:      txHash,
+		TxIndex:     111,
+		BlockHash:   common.BytesToHash([]byte{1, 2, 3, 4, 5}),
+		Index:       7,
+		Removed:     false,
 	}
 }
--- a/accounts/abi/bind/bind.go
+++ b/accounts/abi/bind/bind.go
@@ -77,6 +77,8 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 			calls     = make(map[string]*tmplMethod)
 			transacts = make(map[string]*tmplMethod)
 			events    = make(map[string]*tmplEvent)
+			fallback  *tmplMethod
+			receive   *tmplMethod

 			// identifiers are used to detect duplicated identifier of function
 			// and event. For all calls, transacts and events, abigen will generate
@@ -92,7 +94,7 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 			normalizedName := methodNormalizer[lang](alias(aliases, original.Name))
 			// Ensure there is no duplicated identifier
 			var identifiers = callIdentifiers
-			if !original.Const {
+			if !original.IsConstant() {
 				identifiers = transactIdentifiers
 			}
 			if identifiers[normalizedName] {
@@ -121,7 +123,7 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 				}
 			}
 			// Append the methods to the call or transact lists
-			if original.Const {
+			if original.IsConstant() {
 				calls[original.Name] = &tmplMethod{Original: original, Normalized: normalized, Structured: structured(original.Outputs)}
 			} else {
 				transacts[original.Name] = &tmplMethod{Original: original, Normalized: normalized, Structured: structured(original.Outputs)}
@@ -156,7 +158,13 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 			// Append the event to the accumulator list
 			events[original.Name] = &tmplEvent{Original: original, Normalized: normalized}
 		}
-
+		// Add two special fallback functions if they exist
+		if evmABI.HasFallback() {
+			fallback = &tmplMethod{Original: evmABI.Fallback}
+		}
+		if evmABI.HasReceive() {
+			receive = &tmplMethod{Original: evmABI.Receive}
+		}
 		// There is no easy way to pass arbitrary java objects to the Go side.
 		if len(structs) > 0 && lang == LangJava {
 			return "", errors.New("java binding for tuple arguments is not supported yet")
@@ -169,6 +177,8 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 			Constructor: evmABI.Constructor,
 			Calls:       calls,
 			Transacts:   transacts,
+			Fallback:    fallback,
+			Receive:     receive,
 			Events:      events,
 			Libraries:   make(map[string]string),
 		}
@@ -210,8 +220,6 @@ func Bind(types []string, abis []string, bytecodes []string, fsigs []map[string]
 		"bindtype":      bindType[lang],
 		"bindtopictype": bindTopicType[lang],
 		"namedtype":     namedType[lang],
-		"formatmethod":  formatMethod,
-		"formatevent":   formatEvent,
 		"capitalise":    capitalise,
 		"decapitalise":  decapitalise,
 	}
@@ -527,9 +535,7 @@ var methodNormalizer = map[Lang]func(string) string{
 }

 // capitalise makes a camel-case string which starts with an upper case character.
-func capitalise(input string) string {
-	return abi.ToCamelCase(input)
-}
+var capitalise = abi.ToCamelCase

 // decapitalise makes a camel-case string which starts with a lower case character.
 func decapitalise(input string) string {
@@ -578,63 +584,3 @@ func hasStruct(t abi.Type) bool {
 		return false
 	}
 }
-
-// resolveArgName converts a raw argument representation into a user friendly format.
-func resolveArgName(arg abi.Argument, structs map[string]*tmplStruct) string {
-	var (
-		prefix   string
-		embedded string
-		typ      = &arg.Type
-	)
-loop:
-	for {
-		switch typ.T {
-		case abi.SliceTy:
-			prefix += "[]"
-		case abi.ArrayTy:
-			prefix += fmt.Sprintf("[%d]", typ.Size)
-		default:
-			embedded = typ.TupleRawName + typ.String()
-			break loop
-		}
-		typ = typ.Elem
-	}
-	if s, exist := structs[embedded]; exist {
-		return prefix + s.Name
-	} else {
-		return arg.Type.String()
-	}
-}
-
-// formatMethod transforms raw method representation into a user friendly one.
-func formatMethod(method abi.Method, structs map[string]*tmplStruct) string {
-	inputs := make([]string, len(method.Inputs))
-	for i, input := range method.Inputs {
-		inputs[i] = fmt.Sprintf("%v %v", resolveArgName(input, structs), input.Name)
-	}
-	outputs := make([]string, len(method.Outputs))
-	for i, output := range method.Outputs {
-		outputs[i] = resolveArgName(output, structs)
-		if len(output.Name) > 0 {
-			outputs[i] += fmt.Sprintf(" %v", output.Name)
-		}
-	}
-	constant := ""
-	if method.Const {
-		constant = "constant "
-	}
-	return fmt.Sprintf("function %v(%v) %sreturns(%v)", method.RawName, strings.Join(inputs, ", "), constant, strings.Join(outputs, ", "))
-}
-
-// formatEvent transforms raw event representation into a user friendly one.
-func formatEvent(event abi.Event, structs map[string]*tmplStruct) string {
-	inputs := make([]string, len(event.Inputs))
-	for i, input := range event.Inputs {
-		if input.Indexed {
-			inputs[i] = fmt.Sprintf("%v indexed %v", resolveArgName(input, structs), input.Name)
-		} else {
-			inputs[i] = fmt.Sprintf("%v %v", resolveArgName(input, structs), input.Name)
-		}
-	}
-	return fmt.Sprintf("event %v(%v)", event.RawName, strings.Join(inputs, ", "))
-}
--- a/accounts/abi/bind/bind_test.go
+++ b/accounts/abi/bind/bind_test.go
--- a/accounts/abi/bind/template.go
+++ b/accounts/abi/bind/template.go
@@ -35,6 +35,8 @@ type tmplContract struct {
 	Constructor abi.Method             // Contract constructor for deploy parametrization
 	Calls       map[string]*tmplMethod // Contract calls that only read state data
 	Transacts   map[string]*tmplMethod // Contract calls that write state data
+	Fallback    *tmplMethod            // Additional special fallback function
+	Receive     *tmplMethod            // Additional special receive function
 	Events      map[string]*tmplEvent  // Contract events accessors
 	Libraries   map[string]string      // Same as tmplData, but filtered to only keep what the contract needs
 	Library     bool                   // Indicator whether the contract is a library
@@ -62,7 +64,7 @@ type tmplField struct {
 	SolKind abi.Type // Raw abi type information
 }

-// tmplStruct is a wrapper around an abi.tuple contains a auto-generated
+// tmplStruct is a wrapper around an abi.tuple contains an auto-generated
 // struct name.
 type tmplStruct struct {
 	Name   string       // Auto-generated struct name(before solidity v0.5.11) or raw name.
@@ -101,7 +103,6 @@ var (
 	_ = big.NewInt
 	_ = strings.NewReader
 	_ = ethereum.NotFound
-	_ = abi.U256
 	_ = bind.Bind
 	_ = common.Big1
 	_ = types.BloomLookup
@@ -296,7 +297,7 @@ var (
 	{{range .Calls}}
 		// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.ID}}.
 		//
-		// Solidity: {{formatmethod .Original $structs}}
+		// Solidity: {{.Original.String}}
 		func (_{{$contract.Type}} *{{$contract.Type}}Caller) {{.Normalized.Name}}(opts *bind.CallOpts {{range .Normalized.Inputs}}, {{.Name}} {{bindtype .Type $structs}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type $structs}};{{end}} },{{else}}{{range .Normalized.Outputs}}{{bindtype .Type $structs}},{{end}}{{end}} error) {
 			{{if .Structured}}ret := new(struct{
 				{{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type $structs}}
@@ -315,14 +316,14 @@ var (

 		// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.ID}}.
 		//
-		// Solidity: {{formatmethod .Original $structs}}
+		// Solidity: {{.Original.String}}
 		func (_{{$contract.Type}} *{{$contract.Type}}Session) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type $structs}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type $structs}};{{end}} }, {{else}} {{range .Normalized.Outputs}}{{bindtype .Type $structs}},{{end}} {{end}} error) {
 		  return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.CallOpts {{range .Normalized.Inputs}}, {{.Name}}{{end}})
 		}

 		// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.ID}}.
 		//
-		// Solidity: {{formatmethod .Original $structs}}
+		// Solidity: {{.Original.String}}
 		func (_{{$contract.Type}} *{{$contract.Type}}CallerSession) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type $structs}} {{end}}) ({{if .Structured}}struct{ {{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type $structs}};{{end}} }, {{else}} {{range .Normalized.Outputs}}{{bindtype .Type $structs}},{{end}} {{end}} error) {
 		  return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.CallOpts {{range .Normalized.Inputs}}, {{.Name}}{{end}})
 		}
@@ -331,26 +332,72 @@ var (
 	{{range .Transacts}}
 		// {{.Normalized.Name}} is a paid mutator transaction binding the contract method 0x{{printf "%x" .Original.ID}}.
 		//
-		// Solidity: {{formatmethod .Original $structs}}
+		// Solidity: {{.Original.String}}
 		func (_{{$contract.Type}} *{{$contract.Type}}Transactor) {{.Normalized.Name}}(opts *bind.TransactOpts {{range .Normalized.Inputs}}, {{.Name}} {{bindtype .Type $structs}} {{end}}) (*types.Transaction, error) {
 			return _{{$contract.Type}}.contract.Transact(opts, "{{.Original.Name}}" {{range .Normalized.Inputs}}, {{.Name}}{{end}})
 		}

 		// {{.Normalized.Name}} is a paid mutator transaction binding the contract method 0x{{printf "%x" .Original.ID}}.
 		//
-		// Solidity: {{formatmethod .Original $structs}}
+		// Solidity: {{.Original.String}}
 		func (_{{$contract.Type}} *{{$contract.Type}}Session) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type $structs}} {{end}}) (*types.Transaction, error) {
 		  return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.TransactOpts {{range $i, $_ := .Normalized.Inputs}}, {{.Name}}{{end}})
 		}

 		// {{.Normalized.Name}} is a paid mutator transaction binding the contract method 0x{{printf "%x" .Original.ID}}.
 		//
-		// Solidity: {{formatmethod .Original $structs}}
+		// Solidity: {{.Original.String}}
 		func (_{{$contract.Type}} *{{$contract.Type}}TransactorSession) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type $structs}} {{end}}) (*types.Transaction, error) {
 		  return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.TransactOpts {{range $i, $_ := .Normalized.Inputs}}, {{.Name}}{{end}})
 		}
 	{{end}}

+	{{if .Fallback}} 
+		// Fallback is a paid mutator transaction binding the contract fallback function.
+		//
+		// Solidity: {{.Fallback.Original.String}}
+		func (_{{$contract.Type}} *{{$contract.Type}}Transactor) Fallback(opts *bind.TransactOpts, calldata []byte) (*types.Transaction, error) {
+			return _{{$contract.Type}}.contract.RawTransact(opts, calldata)
+		}
+
+		// Fallback is a paid mutator transaction binding the contract fallback function.
+		//
+		// Solidity: {{.Fallback.Original.String}}
+		func (_{{$contract.Type}} *{{$contract.Type}}Session) Fallback(calldata []byte) (*types.Transaction, error) {
+		  return _{{$contract.Type}}.Contract.Fallback(&_{{$contract.Type}}.TransactOpts, calldata)
+		}
+	
+		// Fallback is a paid mutator transaction binding the contract fallback function.
+		// 
+		// Solidity: {{.Fallback.Original.String}}
+		func (_{{$contract.Type}} *{{$contract.Type}}TransactorSession) Fallback(calldata []byte) (*types.Transaction, error) {
+		  return _{{$contract.Type}}.Contract.Fallback(&_{{$contract.Type}}.TransactOpts, calldata)
+		}
+	{{end}}
+
+	{{if .Receive}} 
+		// Receive is a paid mutator transaction binding the contract receive function.
+		//
+		// Solidity: {{.Receive.Original.String}}
+		func (_{{$contract.Type}} *{{$contract.Type}}Transactor) Receive(opts *bind.TransactOpts) (*types.Transaction, error) {
+			return _{{$contract.Type}}.contract.RawTransact(opts, nil) // calldata is disallowed for receive function
+		}
+
+		// Receive is a paid mutator transaction binding the contract receive function.
+		//
+		// Solidity: {{.Receive.Original.String}}
+		func (_{{$contract.Type}} *{{$contract.Type}}Session) Receive() (*types.Transaction, error) {
+		  return _{{$contract.Type}}.Contract.Receive(&_{{$contract.Type}}.TransactOpts)
+		}
+	
+		// Receive is a paid mutator transaction binding the contract receive function.
+		// 
+		// Solidity: {{.Receive.Original.String}}
+		func (_{{$contract.Type}} *{{$contract.Type}}TransactorSession) Receive() (*types.Transaction, error) {
+		  return _{{$contract.Type}}.Contract.Receive(&_{{$contract.Type}}.TransactOpts)
+		}
+	{{end}}
+
 	{{range .Events}}
 		// {{$contract.Type}}{{.Normalized.Name}}Iterator is returned from Filter{{.Normalized.Name}} and is used to iterate over the raw logs and unpacked data for {{.Normalized.Name}} events raised by the {{$contract.Type}} contract.
 		type {{$contract.Type}}{{.Normalized.Name}}Iterator struct {
@@ -424,7 +471,7 @@ var (

 		// Filter{{.Normalized.Name}} is a free log retrieval operation binding the contract event 0x{{printf "%x" .Original.ID}}.
 		//
-		// Solidity: {{formatevent .Original $structs}}
+		// Solidity: {{.Original.String}}
 		func (_{{$contract.Type}} *{{$contract.Type}}Filterer) Filter{{.Normalized.Name}}(opts *bind.FilterOpts{{range .Normalized.Inputs}}{{if .Indexed}}, {{.Name}} []{{bindtype .Type $structs}}{{end}}{{end}}) (*{{$contract.Type}}{{.Normalized.Name}}Iterator, error) {
 			{{range .Normalized.Inputs}}
 			{{if .Indexed}}var {{.Name}}Rule []interface{}
@@ -441,7 +488,7 @@ var (

 		// Watch{{.Normalized.Name}} is a free log subscription operation binding the contract event 0x{{printf "%x" .Original.ID}}.
 		//
-		// Solidity: {{formatevent .Original $structs}}
+		// Solidity: {{.Original.String}}
 		func (_{{$contract.Type}} *{{$contract.Type}}Filterer) Watch{{.Normalized.Name}}(opts *bind.WatchOpts, sink chan<- *{{$contract.Type}}{{.Normalized.Name}}{{range .Normalized.Inputs}}{{if .Indexed}}, {{.Name}} []{{bindtype .Type $structs}}{{end}}{{end}}) (event.Subscription, error) {
 			{{range .Normalized.Inputs}}
 			{{if .Indexed}}var {{.Name}}Rule []interface{}
@@ -483,7 +530,7 @@ var (

 		// Parse{{.Normalized.Name}} is a log parse operation binding the contract event 0x{{printf "%x" .Original.ID}}.
 		//
-		// Solidity: {{formatevent .Original $structs}}
+		// Solidity: {{.Original.String}}
 		func (_{{$contract.Type}} *{{$contract.Type}}Filterer) Parse{{.Normalized.Name}}(log types.Log) (*{{$contract.Type}}{{.Normalized.Name}}, error) {
 			event := new({{$contract.Type}}{{.Normalized.Name}})
 			if err := _{{$contract.Type}}.contract.UnpackLog(event, "{{.Original.Name}}", log); err != nil {
@@ -577,7 +624,7 @@ import java.util.*;
 	// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.ID}}.
 	//
 	// Solidity: {{.Original.String}}
-	public {{if gt (len .Normalized.Outputs) 1}}{{capitalise .Normalized.Name}}Results{{else}}{{range .Normalized.Outputs}}{{bindtype .Type $structs}}{{end}}{{end}} {{.Normalized.Name}}(CallOpts opts{{range .Normalized.Inputs}}, {{bindtype .Type $structs}} {{.Name}}{{end}}) throws Exception {
+	public {{if gt (len .Normalized.Outputs) 1}}{{capitalise .Normalized.Name}}Results{{else if eq (len .Normalized.Outputs) 0}}void{{else}}{{range .Normalized.Outputs}}{{bindtype .Type $structs}}{{end}}{{end}} {{.Normalized.Name}}(CallOpts opts{{range .Normalized.Inputs}}, {{bindtype .Type $structs}} {{.Name}}{{end}}) throws Exception {
 		Interfaces args = Geth.newInterfaces({{(len .Normalized.Inputs)}});
 		{{range $index, $item := .Normalized.Inputs}}Interface arg{{$index}} = Geth.newInterface();arg{{$index}}.set{{namedtype (bindtype .Type $structs) .Type}}({{.Name}});args.set({{$index}},arg{{$index}});
 		{{end}}
@@ -611,6 +658,24 @@ import java.util.*;
 		return this.Contract.transact(opts, "{{.Original.Name}}"	, args);
 	}
 	{{end}}
+
+    {{if .Fallback}}
+	// Fallback is a paid mutator transaction binding the contract fallback function.
+	//
+	// Solidity: {{.Fallback.Original.String}}
+	public Transaction Fallback(TransactOpts opts, byte[] calldata) throws Exception { 
+		return this.Contract.rawTransact(opts, calldata);
+	}
+    {{end}}
+
+    {{if .Receive}}
+	// Receive is a paid mutator transaction binding the contract receive function.
+	//
+	// Solidity: {{.Receive.Original.String}}
+	public Transaction Receive(TransactOpts opts) throws Exception { 
+		return this.Contract.rawTransact(opts, null);
+	}
+    {{end}}
 }
 {{end}}
 `
--- a/accounts/abi/bind/topics.go
+++ b/accounts/abi/bind/topics.go
@@ -1,244 +0,0 @@
-// Copyright 2018 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package bind
-
-import (
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"math/big"
-	"reflect"
-
-	"github.com/ethereum/go-ethereum/accounts/abi"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/crypto"
-)
-
-// makeTopics converts a filter query argument list into a filter topic set.
-func makeTopics(query ...[]interface{}) ([][]common.Hash, error) {
-	topics := make([][]common.Hash, len(query))
-	for i, filter := range query {
-		for _, rule := range filter {
-			var topic common.Hash
-
-			// Try to generate the topic based on simple types
-			switch rule := rule.(type) {
-			case common.Hash:
-				copy(topic[:], rule[:])
-			case common.Address:
-				copy(topic[common.HashLength-common.AddressLength:], rule[:])
-			case *big.Int:
-				blob := rule.Bytes()
-				copy(topic[common.HashLength-len(blob):], blob)
-			case bool:
-				if rule {
-					topic[common.HashLength-1] = 1
-				}
-			case int8:
-				blob := big.NewInt(int64(rule)).Bytes()
-				copy(topic[common.HashLength-len(blob):], blob)
-			case int16:
-				blob := big.NewInt(int64(rule)).Bytes()
-				copy(topic[common.HashLength-len(blob):], blob)
-			case int32:
-				blob := big.NewInt(int64(rule)).Bytes()
-				copy(topic[common.HashLength-len(blob):], blob)
-			case int64:
-				blob := big.NewInt(rule).Bytes()
-				copy(topic[common.HashLength-len(blob):], blob)
-			case uint8:
-				blob := new(big.Int).SetUint64(uint64(rule)).Bytes()
-				copy(topic[common.HashLength-len(blob):], blob)
-			case uint16:
-				blob := new(big.Int).SetUint64(uint64(rule)).Bytes()
-				copy(topic[common.HashLength-len(blob):], blob)
-			case uint32:
-				blob := new(big.Int).SetUint64(uint64(rule)).Bytes()
-				copy(topic[common.HashLength-len(blob):], blob)
-			case uint64:
-				blob := new(big.Int).SetUint64(rule).Bytes()
-				copy(topic[common.HashLength-len(blob):], blob)
-			case string:
-				hash := crypto.Keccak256Hash([]byte(rule))
-				copy(topic[:], hash[:])
-			case []byte:
-				hash := crypto.Keccak256Hash(rule)
-				copy(topic[:], hash[:])
-
-			default:
-				// todo(rjl493456442) according solidity documentation, indexed event
-				// parameters that are not value types i.e. arrays and structs are not
-				// stored directly but instead a keccak256-hash of an encoding is stored.
-				//
-				// We only convert stringS and bytes to hash, still need to deal with
-				// array(both fixed-size and dynamic-size) and struct.
-
-				// Attempt to generate the topic from funky types
-				val := reflect.ValueOf(rule)
-				switch {
-				// static byte array
-				case val.Kind() == reflect.Array && reflect.TypeOf(rule).Elem().Kind() == reflect.Uint8:
-					reflect.Copy(reflect.ValueOf(topic[:val.Len()]), val)
-				default:
-					return nil, fmt.Errorf("unsupported indexed type: %T", rule)
-				}
-			}
-			topics[i] = append(topics[i], topic)
-		}
-	}
-	return topics, nil
-}
-
-// Big batch of reflect types for topic reconstruction.
-var (
-	reflectHash    = reflect.TypeOf(common.Hash{})
-	reflectAddress = reflect.TypeOf(common.Address{})
-	reflectBigInt  = reflect.TypeOf(new(big.Int))
-)
-
-// parseTopics converts the indexed topic fields into actual log field values.
-//
-// Note, dynamic types cannot be reconstructed since they get mapped to Keccak256
-// hashes as the topic value!
-func parseTopics(out interface{}, fields abi.Arguments, topics []common.Hash) error {
-	// Sanity check that the fields and topics match up
-	if len(fields) != len(topics) {
-		return errors.New("topic/field count mismatch")
-	}
-	// Iterate over all the fields and reconstruct them from topics
-	for _, arg := range fields {
-		if !arg.Indexed {
-			return errors.New("non-indexed field in topic reconstruction")
-		}
-		field := reflect.ValueOf(out).Elem().FieldByName(capitalise(arg.Name))
-
-		// Try to parse the topic back into the fields based on primitive types
-		switch field.Kind() {
-		case reflect.Bool:
-			if topics[0][common.HashLength-1] == 1 {
-				field.Set(reflect.ValueOf(true))
-			}
-		case reflect.Int8:
-			num := new(big.Int).SetBytes(topics[0][:])
-			field.Set(reflect.ValueOf(int8(num.Int64())))
-
-		case reflect.Int16:
-			num := new(big.Int).SetBytes(topics[0][:])
-			field.Set(reflect.ValueOf(int16(num.Int64())))
-
-		case reflect.Int32:
-			num := new(big.Int).SetBytes(topics[0][:])
-			field.Set(reflect.ValueOf(int32(num.Int64())))
-
-		case reflect.Int64:
-			num := new(big.Int).SetBytes(topics[0][:])
-			field.Set(reflect.ValueOf(num.Int64()))
-
-		case reflect.Uint8:
-			num := new(big.Int).SetBytes(topics[0][:])
-			field.Set(reflect.ValueOf(uint8(num.Uint64())))
-
-		case reflect.Uint16:
-			num := new(big.Int).SetBytes(topics[0][:])
-			field.Set(reflect.ValueOf(uint16(num.Uint64())))
-
-		case reflect.Uint32:
-			num := new(big.Int).SetBytes(topics[0][:])
-			field.Set(reflect.ValueOf(uint32(num.Uint64())))
-
-		case reflect.Uint64:
-			num := new(big.Int).SetBytes(topics[0][:])
-			field.Set(reflect.ValueOf(num.Uint64()))
-
-		default:
-			// Ran out of plain primitive types, try custom types
-
-			switch field.Type() {
-			case reflectHash: // Also covers all dynamic types
-				field.Set(reflect.ValueOf(topics[0]))
-
-			case reflectAddress:
-				var addr common.Address
-				copy(addr[:], topics[0][common.HashLength-common.AddressLength:])
-				field.Set(reflect.ValueOf(addr))
-
-			case reflectBigInt:
-				num := new(big.Int).SetBytes(topics[0][:])
-				field.Set(reflect.ValueOf(num))
-
-			default:
-				// Ran out of custom types, try the crazies
-				switch {
-				// static byte array
-				case arg.Type.T == abi.FixedBytesTy:
-					reflect.Copy(field, reflect.ValueOf(topics[0][:arg.Type.Size]))
-				default:
-					return fmt.Errorf("unsupported indexed type: %v", arg.Type)
-				}
-			}
-		}
-		topics = topics[1:]
-	}
-	return nil
-}
-
-// parseTopicsIntoMap converts the indexed topic field-value pairs into map key-value pairs
-func parseTopicsIntoMap(out map[string]interface{}, fields abi.Arguments, topics []common.Hash) error {
-	// Sanity check that the fields and topics match up
-	if len(fields) != len(topics) {
-		return errors.New("topic/field count mismatch")
-	}
-	// Iterate over all the fields and reconstruct them from topics
-	for _, arg := range fields {
-		if !arg.Indexed {
-			return errors.New("non-indexed field in topic reconstruction")
-		}
-
-		switch arg.Type.T {
-		case abi.BoolTy:
-			out[arg.Name] = topics[0][common.HashLength-1] == 1
-		case abi.IntTy, abi.UintTy:
-			num := new(big.Int).SetBytes(topics[0][:])
-			out[arg.Name] = num
-		case abi.AddressTy:
-			var addr common.Address
-			copy(addr[:], topics[0][common.HashLength-common.AddressLength:])
-			out[arg.Name] = addr
-		case abi.HashTy:
-			out[arg.Name] = topics[0]
-		case abi.FixedBytesTy:
-			out[arg.Name] = topics[0][:]
-		case abi.StringTy, abi.BytesTy, abi.SliceTy, abi.ArrayTy:
-			// Array types (including strings and bytes) have their keccak256 hashes stored in the topic- not a hash
-			// whose bytes can be decoded to the actual value- so the best we can do is retrieve that hash
-			out[arg.Name] = topics[0]
-		case abi.FunctionTy:
-			if garbage := binary.BigEndian.Uint64(topics[0][0:8]); garbage != 0 {
-				return fmt.Errorf("bind: got improperly encoded function type, got %v", topics[0].Bytes())
-			}
-			var tmp [24]byte
-			copy(tmp[:], topics[0][8:32])
-			out[arg.Name] = tmp
-		default: // Not handling tuples
-			return fmt.Errorf("unsupported indexed type: %v", arg.Type)
-		}
-
-		topics = topics[1:]
-	}
-
-	return nil
-}
--- a/accounts/abi/bind/topics_test.go
+++ b/accounts/abi/bind/topics_test.go
@@ -1,103 +0,0 @@
-// Copyright 2019 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package bind
-
-import (
-	"reflect"
-	"testing"
-
-	"github.com/ethereum/go-ethereum/accounts/abi"
-	"github.com/ethereum/go-ethereum/common"
-)
-
-func TestMakeTopics(t *testing.T) {
-	type args struct {
-		query [][]interface{}
-	}
-	tests := []struct {
-		name    string
-		args    args
-		want    [][]common.Hash
-		wantErr bool
-	}{
-		{
-			"support fixed byte types, right padded to 32 bytes",
-			args{[][]interface{}{{[5]byte{1, 2, 3, 4, 5}}}},
-			[][]common.Hash{{common.Hash{1, 2, 3, 4, 5}}},
-			false,
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			got, err := makeTopics(tt.args.query...)
-			if (err != nil) != tt.wantErr {
-				t.Errorf("makeTopics() error = %v, wantErr %v", err, tt.wantErr)
-				return
-			}
-			if !reflect.DeepEqual(got, tt.want) {
-				t.Errorf("makeTopics() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}
-
-func TestParseTopics(t *testing.T) {
-	type bytesStruct struct {
-		StaticBytes [5]byte
-	}
-	bytesType, _ := abi.NewType("bytes5", "", nil)
-	type args struct {
-		createObj func() interface{}
-		resultObj func() interface{}
-		fields    abi.Arguments
-		topics    []common.Hash
-	}
-	tests := []struct {
-		name    string
-		args    args
-		wantErr bool
-	}{
-		{
-			name: "support fixed byte types, right padded to 32 bytes",
-			args: args{
-				createObj: func() interface{} { return &bytesStruct{} },
-				resultObj: func() interface{} { return &bytesStruct{StaticBytes: [5]byte{1, 2, 3, 4, 5}} },
-				fields: abi.Arguments{abi.Argument{
-					Name:    "staticBytes",
-					Type:    bytesType,
-					Indexed: true,
-				}},
-				topics: []common.Hash{
-					{1, 2, 3, 4, 5},
-				},
-			},
-			wantErr: false,
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			createObj := tt.args.createObj()
-			if err := parseTopics(createObj, tt.args.fields, tt.args.topics); (err != nil) != tt.wantErr {
-				t.Errorf("parseTopics() error = %v, wantErr %v", err, tt.wantErr)
-			}
-			resultObj := tt.args.resultObj()
-			if !reflect.DeepEqual(createObj, resultObj) {
-				t.Errorf("parseTopics() = %v, want %v", createObj, resultObj)
-			}
-		})
-	}
-}
--- a/accounts/abi/bind/util.go
+++ b/accounts/abi/bind/util.go
@@ -18,7 +18,7 @@ package bind

 import (
 	"context"
-	"fmt"
+	"errors"
 	"time"

 	"github.com/ethereum/go-ethereum/common"
@@ -56,14 +56,14 @@ func WaitMined(ctx context.Context, b DeployBackend, tx *types.Transaction) (*ty
 // contract address when it is mined. It stops waiting when ctx is canceled.
 func WaitDeployed(ctx context.Context, b DeployBackend, tx *types.Transaction) (common.Address, error) {
 	if tx.To() != nil {
-		return common.Address{}, fmt.Errorf("tx is not contract creation")
+		return common.Address{}, errors.New("tx is not contract creation")
 	}
 	receipt, err := WaitMined(ctx, b, tx)
 	if err != nil {
 		return common.Address{}, err
 	}
 	if receipt.ContractAddress == (common.Address{}) {
-		return common.Address{}, fmt.Errorf("zero address")
+		return common.Address{}, errors.New("zero address")
 	}
 	// Check that code has indeed been deployed at the address.
 	// This matters on pre-Homestead chains: OOG in the constructor
--- a/accounts/abi/bind/util_test.go
+++ b/accounts/abi/bind/util_test.go
@@ -18,6 +18,7 @@ package bind_test

 import (
 	"context"
+	"errors"
 	"math/big"
 	"testing"
 	"time"
@@ -84,7 +85,7 @@ func TestWaitDeployed(t *testing.T) {
 		select {
 		case <-mined:
 			if err != test.wantErr {
-				t.Errorf("test %q: error mismatch: got %q, want %q", name, err, test.wantErr)
+				t.Errorf("test %q: error mismatch: want %q, got %q", name, test.wantErr, err)
 			}
 			if address != test.wantAddress {
 				t.Errorf("test %q: unexpected contract address %s", name, address.Hex())
@@ -94,3 +95,40 @@ func TestWaitDeployed(t *testing.T) {
 		}
 	}
 }
+
+func TestWaitDeployedCornerCases(t *testing.T) {
+	backend := backends.NewSimulatedBackend(
+		core.GenesisAlloc{
+			crypto.PubkeyToAddress(testKey.PublicKey): {Balance: big.NewInt(10000000000)},
+		},
+		10000000,
+	)
+	defer backend.Close()
+
+	// Create a transaction to an account.
+	code := "6060604052600a8060106000396000f360606040526008565b00"
+	tx := types.NewTransaction(0, common.HexToAddress("0x01"), big.NewInt(0), 3000000, big.NewInt(1), common.FromHex(code))
+	tx, _ = types.SignTx(tx, types.HomesteadSigner{}, testKey)
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	backend.SendTransaction(ctx, tx)
+	backend.Commit()
+	notContentCreation := errors.New("tx is not contract creation")
+	if _, err := bind.WaitDeployed(ctx, backend, tx); err.Error() != notContentCreation.Error() {
+		t.Errorf("error missmatch: want %q, got %q, ", notContentCreation, err)
+	}
+
+	// Create a transaction that is not mined.
+	tx = types.NewContractCreation(1, big.NewInt(0), 3000000, big.NewInt(1), common.FromHex(code))
+	tx, _ = types.SignTx(tx, types.HomesteadSigner{}, testKey)
+
+	go func() {
+		contextCanceled := errors.New("context canceled")
+		if _, err := bind.WaitDeployed(ctx, backend, tx); err.Error() != contextCanceled.Error() {
+			t.Errorf("error missmatch: want %q, got %q, ", contextCanceled, err)
+		}
+	}()
+
+	backend.SendTransaction(ctx, tx)
+	cancel()
+}
--- a/accounts/abi/error.go
+++ b/accounts/abi/error.go
@@ -39,23 +39,21 @@ func formatSliceString(kind reflect.Kind, sliceSize int) string {
 // type in t.
 func sliceTypeCheck(t Type, val reflect.Value) error {
 	if val.Kind() != reflect.Slice && val.Kind() != reflect.Array {
-		return typeErr(formatSliceString(t.Kind, t.Size), val.Type())
+		return typeErr(formatSliceString(t.GetType().Kind(), t.Size), val.Type())
 	}

 	if t.T == ArrayTy && val.Len() != t.Size {
-		return typeErr(formatSliceString(t.Elem.Kind, t.Size), formatSliceString(val.Type().Elem().Kind(), val.Len()))
+		return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), formatSliceString(val.Type().Elem().Kind(), val.Len()))
 	}

-	if t.Elem.T == SliceTy {
+	if t.Elem.T == SliceTy || t.Elem.T == ArrayTy {
 		if val.Len() > 0 {
 			return sliceTypeCheck(*t.Elem, val.Index(0))
 		}
-	} else if t.Elem.T == ArrayTy {
-		return sliceTypeCheck(*t.Elem, val.Index(0))
 	}

-	if elemKind := val.Type().Elem().Kind(); elemKind != t.Elem.Kind {
-		return typeErr(formatSliceString(t.Elem.Kind, t.Size), val.Type())
+	if elemKind := val.Type().Elem().Kind(); elemKind != t.Elem.GetType().Kind() {
+		return typeErr(formatSliceString(t.Elem.GetType().Kind(), t.Size), val.Type())
 	}
 	return nil
 }
@@ -68,10 +66,10 @@ func typeCheck(t Type, value reflect.Value) error {
 	}

 	// Check base type validity. Element types will be checked later on.
-	if t.Kind != value.Kind() {
-		return typeErr(t.Kind, value.Kind())
+	if t.GetType().Kind() != value.Kind() {
+		return typeErr(t.GetType().Kind(), value.Kind())
 	} else if t.T == FixedBytesTy && t.Size != value.Len() {
-		return typeErr(t.Type, value.Type())
+		return typeErr(t.GetType(), value.Type())
 	} else {
 		return nil
 	}
--- a/accounts/abi/event.go
+++ b/accounts/abi/event.go
@@ -42,36 +42,59 @@ type Event struct {
 	RawName   string
 	Anonymous bool
 	Inputs    Arguments
+	str       string
+	// Sig contains the string signature according to the ABI spec.
+	// e.g.	 event foo(uint32 a, int b) = "foo(uint32,int256)"
+	// Please note that "int" is substitute for its canonical representation "int256"
+	Sig string
+	// ID returns the canonical representation of the event's signature used by the
+	// abi definition to identify event names and types.
+	ID common.Hash
+}
+
+// NewEvent creates a new Event.
+// It sanitizes the input arguments to remove unnamed arguments.
+// It also precomputes the id, signature and string representation
+// of the event.
+func NewEvent(name, rawName string, anonymous bool, inputs Arguments) Event {
+	// sanitize inputs to remove inputs without names
+	// and precompute string and sig representation.
+	names := make([]string, len(inputs))
+	types := make([]string, len(inputs))
+	for i, input := range inputs {
+		if input.Name == "" {
+			inputs[i] = Argument{
+				Name:    fmt.Sprintf("arg%d", i),
+				Indexed: input.Indexed,
+				Type:    input.Type,
+			}
+		} else {
+			inputs[i] = input
+		}
+		// string representation
+		names[i] = fmt.Sprintf("%v %v", input.Type, inputs[i].Name)
+		if input.Indexed {
+			names[i] = fmt.Sprintf("%v indexed %v", input.Type, inputs[i].Name)
+		}
+		// sig representation
+		types[i] = input.Type.String()
+	}
+
+	str := fmt.Sprintf("event %v(%v)", rawName, strings.Join(names, ", "))
+	sig := fmt.Sprintf("%v(%v)", rawName, strings.Join(types, ","))
+	id := common.BytesToHash(crypto.Keccak256([]byte(sig)))
+
+	return Event{
+		Name:      name,
+		RawName:   rawName,
+		Anonymous: anonymous,
+		Inputs:    inputs,
+		str:       str,
+		Sig:       sig,
+		ID:        id,
+	}
 }

 func (e Event) String() string {
-	inputs := make([]string, len(e.Inputs))
-	for i, input := range e.Inputs {
-		inputs[i] = fmt.Sprintf("%v %v", input.Type, input.Name)
-		if input.Indexed {
-			inputs[i] = fmt.Sprintf("%v indexed %v", input.Type, input.Name)
-		}
-	}
-	return fmt.Sprintf("event %v(%v)", e.RawName, strings.Join(inputs, ", "))
-}
-
-// Sig returns the event string signature according to the ABI spec.
-//
-// Example
-//
-//     event foo(uint32 a, int b) = "foo(uint32,int256)"
-//
-// Please note that "int" is substitute for its canonical representation "int256"
-func (e Event) Sig() string {
-	types := make([]string, len(e.Inputs))
-	for i, input := range e.Inputs {
-		types[i] = input.Type.String()
-	}
-	return fmt.Sprintf("%v(%v)", e.RawName, strings.Join(types, ","))
-}
-
-// ID returns the canonical representation of the event's signature used by the
-// abi definition to identify event names and types.
-func (e Event) ID() common.Hash {
-	return common.BytesToHash(crypto.Keccak256([]byte(e.Sig())))
+	return e.str
 }
--- a/accounts/abi/event_test.go
+++ b/accounts/abi/event_test.go
@@ -104,8 +104,8 @@ func TestEventId(t *testing.T) {
 		}

 		for name, event := range abi.Events {
-			if event.ID() != test.expectations[name] {
-				t.Errorf("expected id to be %x, got %x", test.expectations[name], event.ID())
+			if event.ID != test.expectations[name] {
+				t.Errorf("expected id to be %x, got %x", test.expectations[name], event.ID)
 			}
 		}
 	}
@@ -312,14 +312,14 @@ func TestEventTupleUnpack(t *testing.T) {
 		&[]interface{}{common.Address{}, new(big.Int)},
 		&[]interface{}{},
 		jsonEventPledge,
-		"abi: insufficient number of elements in the list/array for unpack, want 3, got 2",
+		"abi: insufficient number of arguments for unpack, want 3, got 2",
 		"Can not unpack Pledge event into too short slice",
 	}, {
 		pledgeData1,
 		new(map[string]interface{}),
 		&[]interface{}{},
 		jsonEventPledge,
-		"abi: cannot unmarshal tuple into map[string]interface {}",
+		"abi:[2] cannot unmarshal tuple in to map[string]interface {}",
 		"Can not unpack Pledge event into map",
 	}, {
 		mixedCaseData1,
--- a/accounts/abi/method.go
+++ b/accounts/abi/method.go
@@ -23,6 +23,24 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 )

+// FunctionType represents different types of functions a contract might have.
+type FunctionType int
+
+const (
+	// Constructor represents the constructor of the contract.
+	// The constructor function is called while deploying a contract.
+	Constructor FunctionType = iota
+	// Fallback represents the fallback function.
+	// This function is executed if no other function matches the given function
+	// signature and no receive function is specified.
+	Fallback
+	// Receive represents the receive function.
+	// This function is executed on plain Ether transfers.
+	Receive
+	// Function represents a normal function.
+	Function
+)
+
 // Method represents a callable given a `Name` and whether the method is a constant.
 // If the method is `Const` no transaction needs to be created for this
 // particular Method call. It can easily be simulated using a local VM.
@@ -41,50 +59,109 @@ type Method struct {
 	// * foo(uint,uint)
 	// The method name of the first one will be resolved as foo while the second one
 	// will be resolved as foo0.
-	Name string
-	// RawName is the raw method name parsed from ABI.
-	RawName string
-	Const   bool
+	Name    string
+	RawName string // RawName is the raw method name parsed from ABI
+
+	// Type indicates whether the method is a
+	// special fallback introduced in solidity v0.6.0
+	Type FunctionType
+
+	// StateMutability indicates the mutability state of method,
+	// the default value is nonpayable. It can be empty if the abi
+	// is generated by legacy compiler.
+	StateMutability string
+
+	// Legacy indicators generated by compiler before v0.6.0
+	Constant bool
+	Payable  bool
+
 	Inputs  Arguments
 	Outputs Arguments
+	str     string
+	// Sig returns the methods string signature according to the ABI spec.
+	// e.g.		function foo(uint32 a, int b) = "foo(uint32,int256)"
+	// Please note that "int" is substitute for its canonical representation "int256"
+	Sig string
+	// ID returns the canonical representation of the method's signature used by the
+	// abi definition to identify method names and types.
+	ID []byte
 }

-// Sig returns the methods string signature according to the ABI spec.
-//
-// Example
-//
-//     function foo(uint32 a, int b) = "foo(uint32,int256)"
-//
-// Please note that "int" is substitute for its canonical representation "int256"
-func (method Method) Sig() string {
-	types := make([]string, len(method.Inputs))
-	for i, input := range method.Inputs {
+// NewMethod creates a new Method.
+// A method should always be created using NewMethod.
+// It also precomputes the sig representation and the string representation
+// of the method.
+func NewMethod(name string, rawName string, funType FunctionType, mutability string, isConst, isPayable bool, inputs Arguments, outputs Arguments) Method {
+	var (
+		types       = make([]string, len(inputs))
+		inputNames  = make([]string, len(inputs))
+		outputNames = make([]string, len(outputs))
+	)
+	for i, input := range inputs {
+		inputNames[i] = fmt.Sprintf("%v %v", input.Type, input.Name)
 		types[i] = input.Type.String()
 	}
-	return fmt.Sprintf("%v(%v)", method.RawName, strings.Join(types, ","))
+	for i, output := range outputs {
+		outputNames[i] = output.Type.String()
+		if len(output.Name) > 0 {
+			outputNames[i] += fmt.Sprintf(" %v", output.Name)
+		}
+	}
+	// calculate the signature and method id. Note only function
+	// has meaningful signature and id.
+	var (
+		sig string
+		id  []byte
+	)
+	if funType == Function {
+		sig = fmt.Sprintf("%v(%v)", rawName, strings.Join(types, ","))
+		id = crypto.Keccak256([]byte(sig))[:4]
+	}
+	// Extract meaningful state mutability of solidity method.
+	// If it's default value, never print it.
+	state := mutability
+	if state == "nonpayable" {
+		state = ""
+	}
+	if state != "" {
+		state = state + " "
+	}
+	identity := fmt.Sprintf("function %v", rawName)
+	if funType == Fallback {
+		identity = "fallback"
+	} else if funType == Receive {
+		identity = "receive"
+	} else if funType == Constructor {
+		identity = "constructor"
+	}
+	str := fmt.Sprintf("%v(%v) %sreturns(%v)", identity, strings.Join(inputNames, ", "), state, strings.Join(outputNames, ", "))
+
+	return Method{
+		Name:            name,
+		RawName:         rawName,
+		Type:            funType,
+		StateMutability: mutability,
+		Constant:        isConst,
+		Payable:         isPayable,
+		Inputs:          inputs,
+		Outputs:         outputs,
+		str:             str,
+		Sig:             sig,
+		ID:              id,
+	}
 }

 func (method Method) String() string {
-	inputs := make([]string, len(method.Inputs))
-	for i, input := range method.Inputs {
-		inputs[i] = fmt.Sprintf("%v %v", input.Type, input.Name)
-	}
-	outputs := make([]string, len(method.Outputs))
-	for i, output := range method.Outputs {
-		outputs[i] = output.Type.String()
-		if len(output.Name) > 0 {
-			outputs[i] += fmt.Sprintf(" %v", output.Name)
-		}
-	}
-	constant := ""
-	if method.Const {
-		constant = "constant "
-	}
-	return fmt.Sprintf("function %v(%v) %sreturns(%v)", method.RawName, strings.Join(inputs, ", "), constant, strings.Join(outputs, ", "))
+	return method.str
 }

-// ID returns the canonical representation of the method's signature used by the
-// abi definition to identify method names and types.
-func (method Method) ID() []byte {
-	return crypto.Keccak256([]byte(method.Sig()))[:4]
+// IsConstant returns the indicator whether the method is read-only.
+func (method Method) IsConstant() bool {
+	return method.StateMutability == "view" || method.StateMutability == "pure" || method.Constant
+}
+
+// IsPayable returns the indicator whether the method can process
+// plain ether transfers.
+func (method Method) IsPayable() bool {
+	return method.StateMutability == "payable" || method.Payable
 }
--- a/accounts/abi/method_test.go
+++ b/accounts/abi/method_test.go
@@ -23,13 +23,15 @@ import (

 const methoddata = `
 [
-	{"type": "function", "name": "balance", "constant": true },
-	{"type": "function", "name": "send", "constant": false, "inputs": [{ "name": "amount", "type": "uint256" }]},
-	{"type": "function", "name": "transfer", "constant": false, "inputs": [{"name": "from", "type": "address"}, {"name": "to", "type": "address"}, {"name": "value", "type": "uint256"}], "outputs": [{"name": "success", "type": "bool"}]},
+	{"type": "function", "name": "balance", "stateMutability": "view"},
+	{"type": "function", "name": "send", "inputs": [{ "name": "amount", "type": "uint256" }]},
+	{"type": "function", "name": "transfer", "inputs": [{"name": "from", "type": "address"}, {"name": "to", "type": "address"}, {"name": "value", "type": "uint256"}], "outputs": [{"name": "success", "type": "bool"}]},
 	{"constant":false,"inputs":[{"components":[{"name":"x","type":"uint256"},{"name":"y","type":"uint256"}],"name":"a","type":"tuple"}],"name":"tuple","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},
 	{"constant":false,"inputs":[{"components":[{"name":"x","type":"uint256"},{"name":"y","type":"uint256"}],"name":"a","type":"tuple[]"}],"name":"tupleSlice","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},
 	{"constant":false,"inputs":[{"components":[{"name":"x","type":"uint256"},{"name":"y","type":"uint256"}],"name":"a","type":"tuple[5]"}],"name":"tupleArray","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},
-	{"constant":false,"inputs":[{"components":[{"name":"x","type":"uint256"},{"name":"y","type":"uint256"}],"name":"a","type":"tuple[5][]"}],"name":"complexTuple","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}
+	{"constant":false,"inputs":[{"components":[{"name":"x","type":"uint256"},{"name":"y","type":"uint256"}],"name":"a","type":"tuple[5][]"}],"name":"complexTuple","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},
+	{"stateMutability":"nonpayable","type":"fallback"},
+	{"stateMutability":"payable","type":"receive"}
 ]`

 func TestMethodString(t *testing.T) {
@@ -39,7 +41,7 @@ func TestMethodString(t *testing.T) {
 	}{
 		{
 			method:      "balance",
-			expectation: "function balance() constant returns()",
+			expectation: "function balance() view returns()",
 		},
 		{
 			method:      "send",
@@ -65,6 +67,14 @@ func TestMethodString(t *testing.T) {
 			method:      "complexTuple",
 			expectation: "function complexTuple((uint256,uint256)[5][] a) returns()",
 		},
+		{
+			method:      "fallback",
+			expectation: "fallback() returns()",
+		},
+		{
+			method:      "receive",
+			expectation: "receive() payable returns()",
+		},
 	}

 	abi, err := JSON(strings.NewReader(methoddata))
@@ -73,7 +83,14 @@ func TestMethodString(t *testing.T) {
 	}

 	for _, test := range table {
-		got := abi.Methods[test.method].String()
+		var got string
+		if test.method == "fallback" {
+			got = abi.Fallback.String()
+		} else if test.method == "receive" {
+			got = abi.Receive.String()
+		} else {
+			got = abi.Methods[test.method].String()
+		}
 		if got != test.expectation {
 			t.Errorf("expected string to be %s, got %s", test.expectation, got)
 		}
@@ -120,7 +137,7 @@ func TestMethodSig(t *testing.T) {
 	}

 	for _, test := range cases {
-		got := abi.Methods[test.method].Sig()
+		got := abi.Methods[test.method].Sig
 		if got != test.expect {
 			t.Errorf("expected string to be %s, got %s", test.expect, got)
 		}
--- a/accounts/abi/pack.go
+++ b/accounts/abi/pack.go
@@ -69,11 +69,11 @@ func packElement(t Type, reflectValue reflect.Value) []byte {
 func packNum(value reflect.Value) []byte {
 	switch kind := value.Kind(); kind {
 	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
-		return U256(new(big.Int).SetUint64(value.Uint()))
+		return math.U256Bytes(new(big.Int).SetUint64(value.Uint()))
 	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		return U256(big.NewInt(value.Int()))
+		return math.U256Bytes(big.NewInt(value.Int()))
 	case reflect.Ptr:
-		return U256(value.Interface().(*big.Int))
+		return math.U256Bytes(new(big.Int).Set(value.Interface().(*big.Int)))
 	default:
 		panic("abi: fatal error")
 	}
--- a/accounts/abi/pack_test.go
+++ b/accounts/abi/pack_test.go
@@ -18,623 +18,62 @@ package abi

 import (
 	"bytes"
+	"encoding/hex"
+	"fmt"
 	"math"
 	"math/big"
 	"reflect"
+	"strconv"
 	"strings"
 	"testing"

 	"github.com/ethereum/go-ethereum/common"
 )

+// TestPack tests the general pack/unpack tests in packing_test.go
 func TestPack(t *testing.T) {
-	for i, test := range []struct {
-		typ        string
-		components []ArgumentMarshaling
-		input      interface{}
-		output     []byte
-	}{
-		{
-			"uint8",
-			nil,
-			uint8(2),
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"uint8[]",
-			nil,
-			[]uint8{1, 2},
-			common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"uint16",
-			nil,
-			uint16(2),
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"uint16[]",
-			nil,
-			[]uint16{1, 2},
-			common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"uint32",
-			nil,
-			uint32(2),
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"uint32[]",
-			nil,
-			[]uint32{1, 2},
-			common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"uint64",
-			nil,
-			uint64(2),
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"uint64[]",
-			nil,
-			[]uint64{1, 2},
-			common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"uint256",
-			nil,
-			big.NewInt(2),
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"uint256[]",
-			nil,
-			[]*big.Int{big.NewInt(1), big.NewInt(2)},
-			common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"int8",
-			nil,
-			int8(2),
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"int8[]",
-			nil,
-			[]int8{1, 2},
-			common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"int16",
-			nil,
-			int16(2),
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"int16[]",
-			nil,
-			[]int16{1, 2},
-			common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"int32",
-			nil,
-			int32(2),
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"int32[]",
-			nil,
-			[]int32{1, 2},
-			common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"int64",
-			nil,
-			int64(2),
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"int64[]",
-			nil,
-			[]int64{1, 2},
-			common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"int256",
-			nil,
-			big.NewInt(2),
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"int256[]",
-			nil,
-			[]*big.Int{big.NewInt(1), big.NewInt(2)},
-			common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002"),
-		},
-		{
-			"bytes1",
-			nil,
-			[1]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes2",
-			nil,
-			[2]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes3",
-			nil,
-			[3]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes4",
-			nil,
-			[4]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes5",
-			nil,
-			[5]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes6",
-			nil,
-			[6]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes7",
-			nil,
-			[7]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes8",
-			nil,
-			[8]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes9",
-			nil,
-			[9]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes10",
-			nil,
-			[10]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes11",
-			nil,
-			[11]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes12",
-			nil,
-			[12]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes13",
-			nil,
-			[13]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes14",
-			nil,
-			[14]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes15",
-			nil,
-			[15]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes16",
-			nil,
-			[16]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes17",
-			nil,
-			[17]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes18",
-			nil,
-			[18]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes19",
-			nil,
-			[19]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes20",
-			nil,
-			[20]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes21",
-			nil,
-			[21]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes22",
-			nil,
-			[22]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes23",
-			nil,
-			[23]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes24",
-			nil,
-			[24]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes25",
-			nil,
-			[25]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes26",
-			nil,
-			[26]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes27",
-			nil,
-			[27]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes28",
-			nil,
-			[28]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes29",
-			nil,
-			[29]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes30",
-			nil,
-			[30]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes31",
-			nil,
-			[31]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"bytes32",
-			nil,
-			[32]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"uint32[2][3][4]",
-			nil,
-			[4][3][2]uint32{{{1, 2}, {3, 4}, {5, 6}}, {{7, 8}, {9, 10}, {11, 12}}, {{13, 14}, {15, 16}, {17, 18}}, {{19, 20}, {21, 22}, {23, 24}}},
-			common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000050000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000700000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000009000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000d000000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000f000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000110000000000000000000000000000000000000000000000000000000000000012000000000000000000000000000000000000000000000000000000000000001300000000000000000000000000000000000000000000000000000000000000140000000000000000000000000000000000000000000000000000000000000015000000000000000000000000000000000000000000000000000000000000001600000000000000000000000000000000000000000000000000000000000000170000000000000000000000000000000000000000000000000000000000000018"),
-		},
-		{
-			"address[]",
-			nil,
-			[]common.Address{{1}, {2}},
-			common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000200000000000000000000000001000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000"),
-		},
-		{
-			"bytes32[]",
-			nil,
-			[]common.Hash{{1}, {2}},
-			common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000000201000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"function",
-			nil,
-			[24]byte{1},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"string",
-			nil,
-			"foobar",
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000006666f6f6261720000000000000000000000000000000000000000000000000000"),
-		},
-		{
-			"string[]",
-			nil,
-			[]string{"hello", "foobar"},
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002" + // len(array) = 2
-				"0000000000000000000000000000000000000000000000000000000000000040" + // offset 64 to i = 0
-				"0000000000000000000000000000000000000000000000000000000000000080" + // offset 128 to i = 1
-				"0000000000000000000000000000000000000000000000000000000000000005" + // len(str[0]) = 5
-				"68656c6c6f000000000000000000000000000000000000000000000000000000" + // str[0]
-				"0000000000000000000000000000000000000000000000000000000000000006" + // len(str[1]) = 6
-				"666f6f6261720000000000000000000000000000000000000000000000000000"), // str[1]
-		},
-		{
-			"string[2]",
-			nil,
-			[]string{"hello", "foobar"},
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040" + // offset to i = 0
-				"0000000000000000000000000000000000000000000000000000000000000080" + // offset to i = 1
-				"0000000000000000000000000000000000000000000000000000000000000005" + // len(str[0]) = 5
-				"68656c6c6f000000000000000000000000000000000000000000000000000000" + // str[0]
-				"0000000000000000000000000000000000000000000000000000000000000006" + // len(str[1]) = 6
-				"666f6f6261720000000000000000000000000000000000000000000000000000"), // str[1]
-		},
-		{
-			"bytes32[][]",
-			nil,
-			[][]common.Hash{{{1}, {2}}, {{3}, {4}, {5}}},
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002" + // len(array) = 2
-				"0000000000000000000000000000000000000000000000000000000000000040" + // offset 64 to i = 0
-				"00000000000000000000000000000000000000000000000000000000000000a0" + // offset 160 to i = 1
-				"0000000000000000000000000000000000000000000000000000000000000002" + // len(array[0]) = 2
-				"0100000000000000000000000000000000000000000000000000000000000000" + // array[0][0]
-				"0200000000000000000000000000000000000000000000000000000000000000" + // array[0][1]
-				"0000000000000000000000000000000000000000000000000000000000000003" + // len(array[1]) = 3
-				"0300000000000000000000000000000000000000000000000000000000000000" + // array[1][0]
-				"0400000000000000000000000000000000000000000000000000000000000000" + // array[1][1]
-				"0500000000000000000000000000000000000000000000000000000000000000"), // array[1][2]
-		},
-
-		{
-			"bytes32[][2]",
-			nil,
-			[][]common.Hash{{{1}, {2}}, {{3}, {4}, {5}}},
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040" + // offset 64 to i = 0
-				"00000000000000000000000000000000000000000000000000000000000000a0" + // offset 160 to i = 1
-				"0000000000000000000000000000000000000000000000000000000000000002" + // len(array[0]) = 2
-				"0100000000000000000000000000000000000000000000000000000000000000" + // array[0][0]
-				"0200000000000000000000000000000000000000000000000000000000000000" + // array[0][1]
-				"0000000000000000000000000000000000000000000000000000000000000003" + // len(array[1]) = 3
-				"0300000000000000000000000000000000000000000000000000000000000000" + // array[1][0]
-				"0400000000000000000000000000000000000000000000000000000000000000" + // array[1][1]
-				"0500000000000000000000000000000000000000000000000000000000000000"), // array[1][2]
-		},
-
-		{
-			"bytes32[3][2]",
-			nil,
-			[][]common.Hash{{{1}, {2}, {3}}, {{3}, {4}, {5}}},
-			common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000" + // array[0][0]
-				"0200000000000000000000000000000000000000000000000000000000000000" + // array[0][1]
-				"0300000000000000000000000000000000000000000000000000000000000000" + // array[0][2]
-				"0300000000000000000000000000000000000000000000000000000000000000" + // array[1][0]
-				"0400000000000000000000000000000000000000000000000000000000000000" + // array[1][1]
-				"0500000000000000000000000000000000000000000000000000000000000000"), // array[1][2]
-		},
-		{
-			// static tuple
-			"tuple",
-			[]ArgumentMarshaling{
-				{Name: "a", Type: "int64"},
-				{Name: "b", Type: "int256"},
-				{Name: "c", Type: "int256"},
-				{Name: "d", Type: "bool"},
-				{Name: "e", Type: "bytes32[3][2]"},
-			},
-			struct {
-				A int64
-				B *big.Int
-				C *big.Int
-				D bool
-				E [][]common.Hash
-			}{1, big.NewInt(1), big.NewInt(-1), true, [][]common.Hash{{{1}, {2}, {3}}, {{3}, {4}, {5}}}},
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001" + // struct[a]
-				"0000000000000000000000000000000000000000000000000000000000000001" + // struct[b]
-				"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" + // struct[c]
-				"0000000000000000000000000000000000000000000000000000000000000001" + // struct[d]
-				"0100000000000000000000000000000000000000000000000000000000000000" + // struct[e] array[0][0]
-				"0200000000000000000000000000000000000000000000000000000000000000" + // struct[e] array[0][1]
-				"0300000000000000000000000000000000000000000000000000000000000000" + // struct[e] array[0][2]
-				"0300000000000000000000000000000000000000000000000000000000000000" + // struct[e] array[1][0]
-				"0400000000000000000000000000000000000000000000000000000000000000" + // struct[e] array[1][1]
-				"0500000000000000000000000000000000000000000000000000000000000000"), // struct[e] array[1][2]
-		},
-		{
-			// dynamic tuple
-			"tuple",
-			[]ArgumentMarshaling{
-				{Name: "a", Type: "string"},
-				{Name: "b", Type: "int64"},
-				{Name: "c", Type: "bytes"},
-				{Name: "d", Type: "string[]"},
-				{Name: "e", Type: "int256[]"},
-				{Name: "f", Type: "address[]"},
-			},
-			struct {
-				FieldA string `abi:"a"` // Test whether abi tag works
-				FieldB int64  `abi:"b"`
-				C      []byte
-				D      []string
-				E      []*big.Int
-				F      []common.Address
-			}{"foobar", 1, []byte{1}, []string{"foo", "bar"}, []*big.Int{big.NewInt(1), big.NewInt(-1)}, []common.Address{{1}, {2}}},
-			common.Hex2Bytes("00000000000000000000000000000000000000000000000000000000000000c0" + // struct[a] offset
-				"0000000000000000000000000000000000000000000000000000000000000001" + // struct[b]
-				"0000000000000000000000000000000000000000000000000000000000000100" + // struct[c] offset
-				"0000000000000000000000000000000000000000000000000000000000000140" + // struct[d] offset
-				"0000000000000000000000000000000000000000000000000000000000000220" + // struct[e] offset
-				"0000000000000000000000000000000000000000000000000000000000000280" + // struct[f] offset
-				"0000000000000000000000000000000000000000000000000000000000000006" + // struct[a] length
-				"666f6f6261720000000000000000000000000000000000000000000000000000" + // struct[a] "foobar"
-				"0000000000000000000000000000000000000000000000000000000000000001" + // struct[c] length
-				"0100000000000000000000000000000000000000000000000000000000000000" + // []byte{1}
-				"0000000000000000000000000000000000000000000000000000000000000002" + // struct[d] length
-				"0000000000000000000000000000000000000000000000000000000000000040" + // foo offset
-				"0000000000000000000000000000000000000000000000000000000000000080" + // bar offset
-				"0000000000000000000000000000000000000000000000000000000000000003" + // foo length
-				"666f6f0000000000000000000000000000000000000000000000000000000000" + // foo
-				"0000000000000000000000000000000000000000000000000000000000000003" + // bar offset
-				"6261720000000000000000000000000000000000000000000000000000000000" + // bar
-				"0000000000000000000000000000000000000000000000000000000000000002" + // struct[e] length
-				"0000000000000000000000000000000000000000000000000000000000000001" + // 1
-				"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" + // -1
-				"0000000000000000000000000000000000000000000000000000000000000002" + // struct[f] length
-				"0000000000000000000000000100000000000000000000000000000000000000" + // common.Address{1}
-				"0000000000000000000000000200000000000000000000000000000000000000"), // common.Address{2}
-		},
-		{
-			// nested tuple
-			"tuple",
-			[]ArgumentMarshaling{
-				{Name: "a", Type: "tuple", Components: []ArgumentMarshaling{{Name: "a", Type: "uint256"}, {Name: "b", Type: "uint256[]"}}},
-				{Name: "b", Type: "int256[]"},
-			},
-			struct {
-				A struct {
-					FieldA *big.Int `abi:"a"`
-					B      []*big.Int
+	for i, test := range packUnpackTests {
+		t.Run(strconv.Itoa(i), func(t *testing.T) {
+			encb, err := hex.DecodeString(test.packed)
+			if err != nil {
+				t.Fatalf("invalid hex %s: %v", test.packed, err)
+			}
+			inDef := fmt.Sprintf(`[{ "name" : "method", "type": "function", "inputs": %s}]`, test.def)
+			inAbi, err := JSON(strings.NewReader(inDef))
+			if err != nil {
+				t.Fatalf("invalid ABI definition %s, %v", inDef, err)
+			}
+			var packed []byte
+			if reflect.TypeOf(test.unpacked).Kind() != reflect.Struct {
+				packed, err = inAbi.Pack("method", test.unpacked)
+			} else {
+				// if want is a struct we need to use the components.
+				elem := reflect.ValueOf(test.unpacked)
+				var values []interface{}
+				for i := 0; i < elem.NumField(); i++ {
+					field := elem.Field(i)
+					values = append(values, field.Interface())
 				}
-				B []*big.Int
-			}{
-				A: struct {
-					FieldA *big.Int `abi:"a"` // Test whether abi tag works for nested tuple
-					B      []*big.Int
-				}{big.NewInt(1), []*big.Int{big.NewInt(1), big.NewInt(0)}},
-				B: []*big.Int{big.NewInt(1), big.NewInt(0)}},
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040" + // a offset
-				"00000000000000000000000000000000000000000000000000000000000000e0" + // b offset
-				"0000000000000000000000000000000000000000000000000000000000000001" + // a.a value
-				"0000000000000000000000000000000000000000000000000000000000000040" + // a.b offset
-				"0000000000000000000000000000000000000000000000000000000000000002" + // a.b length
-				"0000000000000000000000000000000000000000000000000000000000000001" + // a.b[0] value
-				"0000000000000000000000000000000000000000000000000000000000000000" + // a.b[1] value
-				"0000000000000000000000000000000000000000000000000000000000000002" + // b length
-				"0000000000000000000000000000000000000000000000000000000000000001" + // b[0] value
-				"0000000000000000000000000000000000000000000000000000000000000000"), // b[1] value
-		},
-		{
-			// tuple slice
-			"tuple[]",
-			[]ArgumentMarshaling{
-				{Name: "a", Type: "int256"},
-				{Name: "b", Type: "int256[]"},
-			},
-			[]struct {
-				A *big.Int
-				B []*big.Int
-			}{
-				{big.NewInt(-1), []*big.Int{big.NewInt(1), big.NewInt(0)}},
-				{big.NewInt(1), []*big.Int{big.NewInt(2), big.NewInt(-1)}},
-			},
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002" + // tuple length
-				"0000000000000000000000000000000000000000000000000000000000000040" + // tuple[0] offset
-				"00000000000000000000000000000000000000000000000000000000000000e0" + // tuple[1] offset
-				"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" + // tuple[0].A
-				"0000000000000000000000000000000000000000000000000000000000000040" + // tuple[0].B offset
-				"0000000000000000000000000000000000000000000000000000000000000002" + // tuple[0].B length
-				"0000000000000000000000000000000000000000000000000000000000000001" + // tuple[0].B[0] value
-				"0000000000000000000000000000000000000000000000000000000000000000" + // tuple[0].B[1] value
-				"0000000000000000000000000000000000000000000000000000000000000001" + // tuple[1].A
-				"0000000000000000000000000000000000000000000000000000000000000040" + // tuple[1].B offset
-				"0000000000000000000000000000000000000000000000000000000000000002" + // tuple[1].B length
-				"0000000000000000000000000000000000000000000000000000000000000002" + // tuple[1].B[0] value
-				"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"), // tuple[1].B[1] value
-		},
-		{
-			// static tuple array
-			"tuple[2]",
-			[]ArgumentMarshaling{
-				{Name: "a", Type: "int256"},
-				{Name: "b", Type: "int256"},
-			},
-			[2]struct {
-				A *big.Int
-				B *big.Int
-			}{
-				{big.NewInt(-1), big.NewInt(1)},
-				{big.NewInt(1), big.NewInt(-1)},
-			},
-			common.Hex2Bytes("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" + // tuple[0].a
-				"0000000000000000000000000000000000000000000000000000000000000001" + // tuple[0].b
-				"0000000000000000000000000000000000000000000000000000000000000001" + // tuple[1].a
-				"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"), // tuple[1].b
-		},
-		{
-			// dynamic tuple array
-			"tuple[2]",
-			[]ArgumentMarshaling{
-				{Name: "a", Type: "int256[]"},
-			},
-			[2]struct {
-				A []*big.Int
-			}{
-				{[]*big.Int{big.NewInt(-1), big.NewInt(1)}},
-				{[]*big.Int{big.NewInt(1), big.NewInt(-1)}},
-			},
-			common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040" + // tuple[0] offset
-				"00000000000000000000000000000000000000000000000000000000000000c0" + // tuple[1] offset
-				"0000000000000000000000000000000000000000000000000000000000000020" + // tuple[0].A offset
-				"0000000000000000000000000000000000000000000000000000000000000002" + // tuple[0].A length
-				"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" + // tuple[0].A[0]
-				"0000000000000000000000000000000000000000000000000000000000000001" + // tuple[0].A[1]
-				"0000000000000000000000000000000000000000000000000000000000000020" + // tuple[1].A offset
-				"0000000000000000000000000000000000000000000000000000000000000002" + // tuple[1].A length
-				"0000000000000000000000000000000000000000000000000000000000000001" + // tuple[1].A[0]
-				"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"), // tuple[1].A[1]
-		},
-	} {
-		typ, err := NewType(test.typ, "", test.components)
-		if err != nil {
-			t.Fatalf("%v failed. Unexpected parse error: %v", i, err)
-		}
-		output, err := typ.pack(reflect.ValueOf(test.input))
-		if err != nil {
-			t.Fatalf("%v failed. Unexpected pack error: %v", i, err)
-		}
+				packed, err = inAbi.Pack("method", values...)
+			}

-		if !bytes.Equal(output, test.output) {
-			t.Errorf("input %d for typ: %v failed. Expected bytes: '%x' Got: '%x'", i, typ.String(), test.output, output)
-		}
+			if err != nil {
+				t.Fatalf("test %d (%v) failed: %v", i, test.def, err)
+			}
+			if !reflect.DeepEqual(packed[4:], encb) {
+				t.Errorf("test %d (%v) failed: expected %v, got %v", i, test.def, encb, packed[4:])
+			}
+		})
 	}
 }

 func TestMethodPack(t *testing.T) {
-	abi, err := JSON(strings.NewReader(jsondata2))
+	abi, err := JSON(strings.NewReader(jsondata))
 	if err != nil {
 		t.Fatal(err)
 	}

-	sig := abi.Methods["slice"].ID()
+	sig := abi.Methods["slice"].ID
 	sig = append(sig, common.LeftPadBytes([]byte{1}, 32)...)
 	sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)

@@ -648,7 +87,7 @@ func TestMethodPack(t *testing.T) {
 	}

 	var addrA, addrB = common.Address{1}, common.Address{2}
-	sig = abi.Methods["sliceAddress"].ID()
+	sig = abi.Methods["sliceAddress"].ID
 	sig = append(sig, common.LeftPadBytes([]byte{32}, 32)...)
 	sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
 	sig = append(sig, common.LeftPadBytes(addrA[:], 32)...)
@@ -663,7 +102,7 @@ func TestMethodPack(t *testing.T) {
 	}

 	var addrC, addrD = common.Address{3}, common.Address{4}
-	sig = abi.Methods["sliceMultiAddress"].ID()
+	sig = abi.Methods["sliceMultiAddress"].ID
 	sig = append(sig, common.LeftPadBytes([]byte{64}, 32)...)
 	sig = append(sig, common.LeftPadBytes([]byte{160}, 32)...)
 	sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
@@ -681,7 +120,7 @@ func TestMethodPack(t *testing.T) {
 		t.Errorf("expected %x got %x", sig, packed)
 	}

-	sig = abi.Methods["slice256"].ID()
+	sig = abi.Methods["slice256"].ID
 	sig = append(sig, common.LeftPadBytes([]byte{1}, 32)...)
 	sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)

@@ -695,7 +134,7 @@ func TestMethodPack(t *testing.T) {
 	}

 	a := [2][2]*big.Int{{big.NewInt(1), big.NewInt(1)}, {big.NewInt(2), big.NewInt(0)}}
-	sig = abi.Methods["nestedArray"].ID()
+	sig = abi.Methods["nestedArray"].ID
 	sig = append(sig, common.LeftPadBytes([]byte{1}, 32)...)
 	sig = append(sig, common.LeftPadBytes([]byte{1}, 32)...)
 	sig = append(sig, common.LeftPadBytes([]byte{2}, 32)...)
@@ -712,7 +151,7 @@ func TestMethodPack(t *testing.T) {
 		t.Errorf("expected %x got %x", sig, packed)
 	}

-	sig = abi.Methods["nestedArray2"].ID()
+	sig = abi.Methods["nestedArray2"].ID
 	sig = append(sig, common.LeftPadBytes([]byte{0x20}, 32)...)
 	sig = append(sig, common.LeftPadBytes([]byte{0x40}, 32)...)
 	sig = append(sig, common.LeftPadBytes([]byte{0x80}, 32)...)
@@ -728,7 +167,7 @@ func TestMethodPack(t *testing.T) {
 		t.Errorf("expected %x got %x", sig, packed)
 	}

-	sig = abi.Methods["nestedSlice"].ID()
+	sig = abi.Methods["nestedSlice"].ID
 	sig = append(sig, common.LeftPadBytes([]byte{0x20}, 32)...)
 	sig = append(sig, common.LeftPadBytes([]byte{0x02}, 32)...)
 	sig = append(sig, common.LeftPadBytes([]byte{0x40}, 32)...)
--- a/accounts/abi/packing_test.go
+++ b/accounts/abi/packing_test.go
@@ -0,0 +1,988 @@
+// Copyright 2020 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package abi
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+)
+
+type packUnpackTest struct {
+	def      string
+	unpacked interface{}
+	packed   string
+}
+
+var packUnpackTests = []packUnpackTest{
+	// Booleans
+	{
+		def:      `[{ "type": "bool" }]`,
+		packed:   "0000000000000000000000000000000000000000000000000000000000000001",
+		unpacked: true,
+	},
+	{
+		def:      `[{ "type": "bool" }]`,
+		packed:   "0000000000000000000000000000000000000000000000000000000000000000",
+		unpacked: false,
+	},
+	// Integers
+	{
+		def:      `[{ "type": "uint8" }]`,
+		unpacked: uint8(2),
+		packed:   "0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{ "type": "uint8[]" }]`,
+		unpacked: []uint8{1, 2},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{ "type": "uint16" }]`,
+		unpacked: uint16(2),
+		packed:   "0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{ "type": "uint16[]" }]`,
+		unpacked: []uint16{1, 2},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "uint17"}]`,
+		packed:   "0000000000000000000000000000000000000000000000000000000000000001",
+		unpacked: big.NewInt(1),
+	},
+	{
+		def:      `[{"type": "uint32"}]`,
+		packed:   "0000000000000000000000000000000000000000000000000000000000000001",
+		unpacked: uint32(1),
+	},
+	{
+		def:      `[{"type": "uint32[]"}]`,
+		unpacked: []uint32{1, 2},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "uint64"}]`,
+		unpacked: uint64(2),
+		packed:   "0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "uint64[]"}]`,
+		unpacked: []uint64{1, 2},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "uint256"}]`,
+		unpacked: big.NewInt(2),
+		packed:   "0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "uint256[]"}]`,
+		unpacked: []*big.Int{big.NewInt(1), big.NewInt(2)},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "int8"}]`,
+		unpacked: int8(2),
+		packed:   "0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "int8[]"}]`,
+		unpacked: []int8{1, 2},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "int16"}]`,
+		unpacked: int16(2),
+		packed:   "0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "int16[]"}]`,
+		unpacked: []int16{1, 2},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "int17"}]`,
+		packed:   "0000000000000000000000000000000000000000000000000000000000000001",
+		unpacked: big.NewInt(1),
+	},
+	{
+		def:      `[{"type": "int32"}]`,
+		unpacked: int32(2),
+		packed:   "0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "int32"}]`,
+		packed:   "0000000000000000000000000000000000000000000000000000000000000001",
+		unpacked: int32(1),
+	},
+	{
+		def:      `[{"type": "int32[]"}]`,
+		unpacked: []int32{1, 2},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "int64"}]`,
+		unpacked: int64(2),
+		packed:   "0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "int64[]"}]`,
+		unpacked: []int64{1, 2},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "int256"}]`,
+		unpacked: big.NewInt(2),
+		packed:   "0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	{
+		def:      `[{"type": "int256"}]`,
+		packed:   "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+		unpacked: big.NewInt(-1),
+	},
+	{
+		def:      `[{"type": "int256[]"}]`,
+		unpacked: []*big.Int{big.NewInt(1), big.NewInt(2)},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+	},
+	// Address
+	{
+		def:      `[{"type": "address"}]`,
+		packed:   "0000000000000000000000000100000000000000000000000000000000000000",
+		unpacked: common.Address{1},
+	},
+	{
+		def:      `[{"type": "address[]"}]`,
+		unpacked: []common.Address{{1}, {2}},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000100000000000000000000000000000000000000" +
+			"0000000000000000000000000200000000000000000000000000000000000000",
+	},
+	// Bytes
+	{
+		def:      `[{"type": "bytes1"}]`,
+		unpacked: [1]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes2"}]`,
+		unpacked: [2]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes3"}]`,
+		unpacked: [3]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes4"}]`,
+		unpacked: [4]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes5"}]`,
+		unpacked: [5]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes6"}]`,
+		unpacked: [6]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes7"}]`,
+		unpacked: [7]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes8"}]`,
+		unpacked: [8]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes9"}]`,
+		unpacked: [9]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes10"}]`,
+		unpacked: [10]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes11"}]`,
+		unpacked: [11]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes12"}]`,
+		unpacked: [12]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes13"}]`,
+		unpacked: [13]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes14"}]`,
+		unpacked: [14]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes15"}]`,
+		unpacked: [15]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes16"}]`,
+		unpacked: [16]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes17"}]`,
+		unpacked: [17]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes18"}]`,
+		unpacked: [18]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes19"}]`,
+		unpacked: [19]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes20"}]`,
+		unpacked: [20]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes21"}]`,
+		unpacked: [21]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes22"}]`,
+		unpacked: [22]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes23"}]`,
+		unpacked: [23]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes24"}]`,
+		unpacked: [24]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes25"}]`,
+		unpacked: [25]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes26"}]`,
+		unpacked: [26]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes27"}]`,
+		unpacked: [27]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes28"}]`,
+		unpacked: [28]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes29"}]`,
+		unpacked: [29]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes30"}]`,
+		unpacked: [30]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes31"}]`,
+		unpacked: [31]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes32"}]`,
+		unpacked: [32]byte{1},
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "bytes32"}]`,
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+		unpacked: [32]byte{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+	},
+	{
+		def: `[{"type": "bytes"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000020" +
+			"0100000000000000000000000000000000000000000000000000000000000000",
+		unpacked: common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
+	},
+	{
+		def:      `[{"type": "bytes32"}]`,
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+		unpacked: [32]byte{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+	},
+	// Functions
+	{
+		def:      `[{"type": "function"}]`,
+		packed:   "0100000000000000000000000000000000000000000000000000000000000000",
+		unpacked: [24]byte{1},
+	},
+	// Slice and Array
+	{
+		def: `[{"type": "uint8[]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: []uint8{1, 2},
+	},
+	{
+		def: `[{"type": "uint8[]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000000",
+		unpacked: []uint8{},
+	},
+	{
+		def: `[{"type": "uint256[]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000000",
+		unpacked: []*big.Int{},
+	},
+	{
+		def: `[{"type": "uint8[2]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: [2]uint8{1, 2},
+	},
+	{
+		def: `[{"type": "int8[2]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: [2]int8{1, 2},
+	},
+	{
+		def: `[{"type": "int16[]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: []int16{1, 2},
+	},
+	{
+		def: `[{"type": "int16[2]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: [2]int16{1, 2},
+	},
+	{
+		def: `[{"type": "int32[]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: []int32{1, 2},
+	},
+	{
+		def: `[{"type": "int32[2]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: [2]int32{1, 2},
+	},
+	{
+		def: `[{"type": "int64[]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: []int64{1, 2},
+	},
+	{
+		def: `[{"type": "int64[2]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: [2]int64{1, 2},
+	},
+	{
+		def: `[{"type": "int256[]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: []*big.Int{big.NewInt(1), big.NewInt(2)},
+	},
+	{
+		def: `[{"type": "int256[3]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000003",
+		unpacked: [3]*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)},
+	},
+	// multi dimensional, if these pass, all types that don't require length prefix should pass
+	{
+		def: `[{"type": "uint8[][]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000000",
+		unpacked: [][]uint8{},
+	},
+	{
+		def: `[{"type": "uint8[][]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000040" +
+			"00000000000000000000000000000000000000000000000000000000000000a0" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: [][]uint8{{1, 2}, {1, 2}},
+	},
+	{
+		def: `[{"type": "uint8[][]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000040" +
+			"00000000000000000000000000000000000000000000000000000000000000a0" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000003" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000003",
+		unpacked: [][]uint8{{1, 2}, {1, 2, 3}},
+	},
+	{
+		def: `[{"type": "uint8[2][2]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: [2][2]uint8{{1, 2}, {1, 2}},
+	},
+	{
+		def: `[{"type": "uint8[][2]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000040" +
+			"0000000000000000000000000000000000000000000000000000000000000060" +
+			"0000000000000000000000000000000000000000000000000000000000000000" +
+			"0000000000000000000000000000000000000000000000000000000000000000",
+		unpacked: [2][]uint8{{}, {}},
+	},
+	{
+		def: `[{"type": "uint8[][2]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000040" +
+			"0000000000000000000000000000000000000000000000000000000000000080" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000001",
+		unpacked: [2][]uint8{{1}, {1}},
+	},
+	{
+		def: `[{"type": "uint8[2][]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000000",
+		unpacked: [][2]uint8{},
+	},
+	{
+		def: `[{"type": "uint8[2][]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: [][2]uint8{{1, 2}},
+	},
+	{
+		def: `[{"type": "uint8[2][]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: [][2]uint8{{1, 2}, {1, 2}},
+	},
+	{
+		def: `[{"type": "uint16[]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: []uint16{1, 2},
+	},
+	{
+		def: `[{"type": "uint16[2]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: [2]uint16{1, 2},
+	},
+	{
+		def: `[{"type": "uint32[]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: []uint32{1, 2},
+	},
+	{
+		def:      `[{"type": "uint32[2][3][4]"}]`,
+		unpacked: [4][3][2]uint32{{{1, 2}, {3, 4}, {5, 6}}, {{7, 8}, {9, 10}, {11, 12}}, {{13, 14}, {15, 16}, {17, 18}}, {{19, 20}, {21, 22}, {23, 24}}},
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000003" +
+			"0000000000000000000000000000000000000000000000000000000000000004" +
+			"0000000000000000000000000000000000000000000000000000000000000005" +
+			"0000000000000000000000000000000000000000000000000000000000000006" +
+			"0000000000000000000000000000000000000000000000000000000000000007" +
+			"0000000000000000000000000000000000000000000000000000000000000008" +
+			"0000000000000000000000000000000000000000000000000000000000000009" +
+			"000000000000000000000000000000000000000000000000000000000000000a" +
+			"000000000000000000000000000000000000000000000000000000000000000b" +
+			"000000000000000000000000000000000000000000000000000000000000000c" +
+			"000000000000000000000000000000000000000000000000000000000000000d" +
+			"000000000000000000000000000000000000000000000000000000000000000e" +
+			"000000000000000000000000000000000000000000000000000000000000000f" +
+			"0000000000000000000000000000000000000000000000000000000000000010" +
+			"0000000000000000000000000000000000000000000000000000000000000011" +
+			"0000000000000000000000000000000000000000000000000000000000000012" +
+			"0000000000000000000000000000000000000000000000000000000000000013" +
+			"0000000000000000000000000000000000000000000000000000000000000014" +
+			"0000000000000000000000000000000000000000000000000000000000000015" +
+			"0000000000000000000000000000000000000000000000000000000000000016" +
+			"0000000000000000000000000000000000000000000000000000000000000017" +
+			"0000000000000000000000000000000000000000000000000000000000000018",
+	},
+
+	{
+		def:      `[{"type": "bytes32[]"}]`,
+		unpacked: []common.Hash{{1}, {2}},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0100000000000000000000000000000000000000000000000000000000000000" +
+			"0200000000000000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def: `[{"type": "uint32[2]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: [2]uint32{1, 2},
+	},
+	{
+		def: `[{"type": "uint64[]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: []uint64{1, 2},
+	},
+	{
+		def: `[{"type": "uint64[2]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: [2]uint64{1, 2},
+	},
+	{
+		def: `[{"type": "uint256[]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: []*big.Int{big.NewInt(1), big.NewInt(2)},
+	},
+	{
+		def: `[{"type": "uint256[3]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000003",
+		unpacked: [3]*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)},
+	},
+	{
+		def: `[{"type": "string[4]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000080" +
+			"00000000000000000000000000000000000000000000000000000000000000c0" +
+			"0000000000000000000000000000000000000000000000000000000000000100" +
+			"0000000000000000000000000000000000000000000000000000000000000140" +
+			"0000000000000000000000000000000000000000000000000000000000000005" +
+			"48656c6c6f000000000000000000000000000000000000000000000000000000" +
+			"0000000000000000000000000000000000000000000000000000000000000005" +
+			"576f726c64000000000000000000000000000000000000000000000000000000" +
+			"000000000000000000000000000000000000000000000000000000000000000b" +
+			"476f2d657468657265756d000000000000000000000000000000000000000000" +
+			"0000000000000000000000000000000000000000000000000000000000000008" +
+			"457468657265756d000000000000000000000000000000000000000000000000",
+		unpacked: [4]string{"Hello", "World", "Go-ethereum", "Ethereum"},
+	},
+	{
+		def: `[{"type": "string[]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000040" +
+			"0000000000000000000000000000000000000000000000000000000000000080" +
+			"0000000000000000000000000000000000000000000000000000000000000008" +
+			"457468657265756d000000000000000000000000000000000000000000000000" +
+			"000000000000000000000000000000000000000000000000000000000000000b" +
+			"676f2d657468657265756d000000000000000000000000000000000000000000",
+		unpacked: []string{"Ethereum", "go-ethereum"},
+	},
+	{
+		def: `[{"type": "bytes[]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000040" +
+			"0000000000000000000000000000000000000000000000000000000000000080" +
+			"0000000000000000000000000000000000000000000000000000000000000003" +
+			"f0f0f00000000000000000000000000000000000000000000000000000000000" +
+			"0000000000000000000000000000000000000000000000000000000000000003" +
+			"f0f0f00000000000000000000000000000000000000000000000000000000000",
+		unpacked: [][]byte{{0xf0, 0xf0, 0xf0}, {0xf0, 0xf0, 0xf0}},
+	},
+	{
+		def: `[{"type": "uint256[2][][]"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000040" +
+			"00000000000000000000000000000000000000000000000000000000000000e0" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"00000000000000000000000000000000000000000000000000000000000000c8" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"00000000000000000000000000000000000000000000000000000000000003e8" +
+			"0000000000000000000000000000000000000000000000000000000000000002" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"00000000000000000000000000000000000000000000000000000000000000c8" +
+			"0000000000000000000000000000000000000000000000000000000000000001" +
+			"00000000000000000000000000000000000000000000000000000000000003e8",
+		unpacked: [][][2]*big.Int{{{big.NewInt(1), big.NewInt(200)}, {big.NewInt(1), big.NewInt(1000)}}, {{big.NewInt(1), big.NewInt(200)}, {big.NewInt(1), big.NewInt(1000)}}},
+	},
+	// struct outputs
+	{
+		def: `[{"name":"int1","type":"int256"},{"name":"int2","type":"int256"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: struct {
+			Int1 *big.Int
+			Int2 *big.Int
+		}{big.NewInt(1), big.NewInt(2)},
+	},
+	{
+		def:    `[{"name":"int_one","type":"int256"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001",
+		unpacked: struct {
+			IntOne *big.Int
+		}{big.NewInt(1)},
+	},
+	{
+		def:    `[{"name":"int__one","type":"int256"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001",
+		unpacked: struct {
+			IntOne *big.Int
+		}{big.NewInt(1)},
+	},
+	{
+		def:    `[{"name":"int_one_","type":"int256"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001",
+		unpacked: struct {
+			IntOne *big.Int
+		}{big.NewInt(1)},
+	},
+	{
+		def: `[{"name":"int_one","type":"int256"}, {"name":"intone","type":"int256"}]`,
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" +
+			"0000000000000000000000000000000000000000000000000000000000000002",
+		unpacked: struct {
+			IntOne *big.Int
+			Intone *big.Int
+		}{big.NewInt(1), big.NewInt(2)},
+	},
+	{
+		def:      `[{"type": "string"}]`,
+		unpacked: "foobar",
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000006" +
+			"666f6f6261720000000000000000000000000000000000000000000000000000",
+	},
+	{
+		def:      `[{"type": "string[]"}]`,
+		unpacked: []string{"hello", "foobar"},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" + // len(array) = 2
+			"0000000000000000000000000000000000000000000000000000000000000040" + // offset 64 to i = 0
+			"0000000000000000000000000000000000000000000000000000000000000080" + // offset 128 to i = 1
+			"0000000000000000000000000000000000000000000000000000000000000005" + // len(str[0]) = 5
+			"68656c6c6f000000000000000000000000000000000000000000000000000000" + // str[0]
+			"0000000000000000000000000000000000000000000000000000000000000006" + // len(str[1]) = 6
+			"666f6f6261720000000000000000000000000000000000000000000000000000", // str[1]
+	},
+	{
+		def:      `[{"type": "string[2]"}]`,
+		unpacked: [2]string{"hello", "foobar"},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000040" + // offset to i = 0
+			"0000000000000000000000000000000000000000000000000000000000000080" + // offset to i = 1
+			"0000000000000000000000000000000000000000000000000000000000000005" + // len(str[0]) = 5
+			"68656c6c6f000000000000000000000000000000000000000000000000000000" + // str[0]
+			"0000000000000000000000000000000000000000000000000000000000000006" + // len(str[1]) = 6
+			"666f6f6261720000000000000000000000000000000000000000000000000000", // str[1]
+	},
+	{
+		def:      `[{"type": "bytes32[][]"}]`,
+		unpacked: [][][32]byte{{{1}, {2}}, {{3}, {4}, {5}}},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" + // len(array) = 2
+			"0000000000000000000000000000000000000000000000000000000000000040" + // offset 64 to i = 0
+			"00000000000000000000000000000000000000000000000000000000000000a0" + // offset 160 to i = 1
+			"0000000000000000000000000000000000000000000000000000000000000002" + // len(array[0]) = 2
+			"0100000000000000000000000000000000000000000000000000000000000000" + // array[0][0]
+			"0200000000000000000000000000000000000000000000000000000000000000" + // array[0][1]
+			"0000000000000000000000000000000000000000000000000000000000000003" + // len(array[1]) = 3
+			"0300000000000000000000000000000000000000000000000000000000000000" + // array[1][0]
+			"0400000000000000000000000000000000000000000000000000000000000000" + // array[1][1]
+			"0500000000000000000000000000000000000000000000000000000000000000", // array[1][2]
+	},
+	{
+		def:      `[{"type": "bytes32[][2]"}]`,
+		unpacked: [2][][32]byte{{{1}, {2}}, {{3}, {4}, {5}}},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000040" + // offset 64 to i = 0
+			"00000000000000000000000000000000000000000000000000000000000000a0" + // offset 160 to i = 1
+			"0000000000000000000000000000000000000000000000000000000000000002" + // len(array[0]) = 2
+			"0100000000000000000000000000000000000000000000000000000000000000" + // array[0][0]
+			"0200000000000000000000000000000000000000000000000000000000000000" + // array[0][1]
+			"0000000000000000000000000000000000000000000000000000000000000003" + // len(array[1]) = 3
+			"0300000000000000000000000000000000000000000000000000000000000000" + // array[1][0]
+			"0400000000000000000000000000000000000000000000000000000000000000" + // array[1][1]
+			"0500000000000000000000000000000000000000000000000000000000000000", // array[1][2]
+	},
+	{
+		def:      `[{"type": "bytes32[3][2]"}]`,
+		unpacked: [2][3][32]byte{{{1}, {2}, {3}}, {{3}, {4}, {5}}},
+		packed: "0100000000000000000000000000000000000000000000000000000000000000" + // array[0][0]
+			"0200000000000000000000000000000000000000000000000000000000000000" + // array[0][1]
+			"0300000000000000000000000000000000000000000000000000000000000000" + // array[0][2]
+			"0300000000000000000000000000000000000000000000000000000000000000" + // array[1][0]
+			"0400000000000000000000000000000000000000000000000000000000000000" + // array[1][1]
+			"0500000000000000000000000000000000000000000000000000000000000000", // array[1][2]
+	},
+	{
+		// static tuple
+		def: `[{"name":"a","type":"int64"}, 
+		{"name":"b","type":"int256"}, 
+		{"name":"c","type":"int256"}, 
+		{"name":"d","type":"bool"},
+		{"name":"e","type":"bytes32[3][2]"}]`,
+		unpacked: struct {
+			A int64
+			B *big.Int
+			C *big.Int
+			D bool
+			E [2][3][32]byte
+		}{1, big.NewInt(1), big.NewInt(-1), true, [2][3][32]byte{{{1}, {2}, {3}}, {{3}, {4}, {5}}}},
+		packed: "0000000000000000000000000000000000000000000000000000000000000001" + // struct[a]
+			"0000000000000000000000000000000000000000000000000000000000000001" + // struct[b]
+			"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" + // struct[c]
+			"0000000000000000000000000000000000000000000000000000000000000001" + // struct[d]
+			"0100000000000000000000000000000000000000000000000000000000000000" + // struct[e] array[0][0]
+			"0200000000000000000000000000000000000000000000000000000000000000" + // struct[e] array[0][1]
+			"0300000000000000000000000000000000000000000000000000000000000000" + // struct[e] array[0][2]
+			"0300000000000000000000000000000000000000000000000000000000000000" + // struct[e] array[1][0]
+			"0400000000000000000000000000000000000000000000000000000000000000" + // struct[e] array[1][1]
+			"0500000000000000000000000000000000000000000000000000000000000000", // struct[e] array[1][2]
+	},
+	{
+		def: `[{"name":"a","type":"string"}, 
+		{"name":"b","type":"int64"}, 
+		{"name":"c","type":"bytes"}, 
+		{"name":"d","type":"string[]"},
+		{"name":"e","type":"int256[]"},
+		{"name":"f","type":"address[]"}]`,
+		unpacked: struct {
+			FieldA string `abi:"a"` // Test whether abi tag works
+			FieldB int64  `abi:"b"`
+			C      []byte
+			D      []string
+			E      []*big.Int
+			F      []common.Address
+		}{"foobar", 1, []byte{1}, []string{"foo", "bar"}, []*big.Int{big.NewInt(1), big.NewInt(-1)}, []common.Address{{1}, {2}}},
+		packed: "00000000000000000000000000000000000000000000000000000000000000c0" + // struct[a] offset
+			"0000000000000000000000000000000000000000000000000000000000000001" + // struct[b]
+			"0000000000000000000000000000000000000000000000000000000000000100" + // struct[c] offset
+			"0000000000000000000000000000000000000000000000000000000000000140" + // struct[d] offset
+			"0000000000000000000000000000000000000000000000000000000000000220" + // struct[e] offset
+			"0000000000000000000000000000000000000000000000000000000000000280" + // struct[f] offset
+			"0000000000000000000000000000000000000000000000000000000000000006" + // struct[a] length
+			"666f6f6261720000000000000000000000000000000000000000000000000000" + // struct[a] "foobar"
+			"0000000000000000000000000000000000000000000000000000000000000001" + // struct[c] length
+			"0100000000000000000000000000000000000000000000000000000000000000" + // []byte{1}
+			"0000000000000000000000000000000000000000000000000000000000000002" + // struct[d] length
+			"0000000000000000000000000000000000000000000000000000000000000040" + // foo offset
+			"0000000000000000000000000000000000000000000000000000000000000080" + // bar offset
+			"0000000000000000000000000000000000000000000000000000000000000003" + // foo length
+			"666f6f0000000000000000000000000000000000000000000000000000000000" + // foo
+			"0000000000000000000000000000000000000000000000000000000000000003" + // bar offset
+			"6261720000000000000000000000000000000000000000000000000000000000" + // bar
+			"0000000000000000000000000000000000000000000000000000000000000002" + // struct[e] length
+			"0000000000000000000000000000000000000000000000000000000000000001" + // 1
+			"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" + // -1
+			"0000000000000000000000000000000000000000000000000000000000000002" + // struct[f] length
+			"0000000000000000000000000100000000000000000000000000000000000000" + // common.Address{1}
+			"0000000000000000000000000200000000000000000000000000000000000000", // common.Address{2}
+	},
+	{
+		def: `[{"components": [{"name": "a","type": "uint256"},	
+							{"name": "b","type": "uint256[]"}],	
+							"name": "a","type": "tuple"},
+							{"name": "b","type": "uint256[]"}]`,
+		unpacked: struct {
+			A struct {
+				FieldA *big.Int `abi:"a"`
+				B      []*big.Int
+			}
+			B []*big.Int
+		}{
+			A: struct {
+				FieldA *big.Int `abi:"a"` // Test whether abi tag works for nested tuple
+				B      []*big.Int
+			}{big.NewInt(1), []*big.Int{big.NewInt(1), big.NewInt(2)}},
+			B: []*big.Int{big.NewInt(1), big.NewInt(2)}},
+		packed: "0000000000000000000000000000000000000000000000000000000000000040" + // a offset
+			"00000000000000000000000000000000000000000000000000000000000000e0" + // b offset
+			"0000000000000000000000000000000000000000000000000000000000000001" + // a.a value
+			"0000000000000000000000000000000000000000000000000000000000000040" + // a.b offset
+			"0000000000000000000000000000000000000000000000000000000000000002" + // a.b length
+			"0000000000000000000000000000000000000000000000000000000000000001" + // a.b[0] value
+			"0000000000000000000000000000000000000000000000000000000000000002" + // a.b[1] value
+			"0000000000000000000000000000000000000000000000000000000000000002" + // b length
+			"0000000000000000000000000000000000000000000000000000000000000001" + // b[0] value
+			"0000000000000000000000000000000000000000000000000000000000000002", // b[1] value
+	},
+
+	{
+		def: `[{"components": [{"name": "a","type": "int256"},	
+							{"name": "b","type": "int256[]"}],	
+							"name": "a","type": "tuple[]"}]`,
+		unpacked: []struct {
+			A *big.Int
+			B []*big.Int
+		}{
+			{big.NewInt(-1), []*big.Int{big.NewInt(1), big.NewInt(3)}},
+			{big.NewInt(1), []*big.Int{big.NewInt(2), big.NewInt(-1)}},
+		},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000002" + // tuple length
+			"0000000000000000000000000000000000000000000000000000000000000040" + // tuple[0] offset
+			"00000000000000000000000000000000000000000000000000000000000000e0" + // tuple[1] offset
+			"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" + // tuple[0].A
+			"0000000000000000000000000000000000000000000000000000000000000040" + // tuple[0].B offset
+			"0000000000000000000000000000000000000000000000000000000000000002" + // tuple[0].B length
+			"0000000000000000000000000000000000000000000000000000000000000001" + // tuple[0].B[0] value
+			"0000000000000000000000000000000000000000000000000000000000000003" + // tuple[0].B[1] value
+			"0000000000000000000000000000000000000000000000000000000000000001" + // tuple[1].A
+			"0000000000000000000000000000000000000000000000000000000000000040" + // tuple[1].B offset
+			"0000000000000000000000000000000000000000000000000000000000000002" + // tuple[1].B length
+			"0000000000000000000000000000000000000000000000000000000000000002" + // tuple[1].B[0] value
+			"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", // tuple[1].B[1] value
+	},
+	{
+		def: `[{"components": [{"name": "a","type": "int256"},	
+							{"name": "b","type": "int256"}],	
+							"name": "a","type": "tuple[2]"}]`,
+		unpacked: [2]struct {
+			A *big.Int
+			B *big.Int
+		}{
+			{big.NewInt(-1), big.NewInt(1)},
+			{big.NewInt(1), big.NewInt(-1)},
+		},
+		packed: "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" + // tuple[0].a
+			"0000000000000000000000000000000000000000000000000000000000000001" + // tuple[0].b
+			"0000000000000000000000000000000000000000000000000000000000000001" + // tuple[1].a
+			"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", // tuple[1].b
+	},
+	{
+		def: `[{"components": [{"name": "a","type": "int256[]"}],
+							"name": "a","type": "tuple[2]"}]`,
+		unpacked: [2]struct {
+			A []*big.Int
+		}{
+			{[]*big.Int{big.NewInt(-1), big.NewInt(1)}},
+			{[]*big.Int{big.NewInt(1), big.NewInt(-1)}},
+		},
+		packed: "0000000000000000000000000000000000000000000000000000000000000020" +
+			"0000000000000000000000000000000000000000000000000000000000000040" + // tuple[0] offset
+			"00000000000000000000000000000000000000000000000000000000000000c0" + // tuple[1] offset
+			"0000000000000000000000000000000000000000000000000000000000000020" + // tuple[0].A offset
+			"0000000000000000000000000000000000000000000000000000000000000002" + // tuple[0].A length
+			"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" + // tuple[0].A[0]
+			"0000000000000000000000000000000000000000000000000000000000000001" + // tuple[0].A[1]
+			"0000000000000000000000000000000000000000000000000000000000000020" + // tuple[1].A offset
+			"0000000000000000000000000000000000000000000000000000000000000002" + // tuple[1].A length
+			"0000000000000000000000000000000000000000000000000000000000000001" + // tuple[1].A[0]
+			"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", // tuple[1].A[1]
+	},
+}
--- a/accounts/abi/reflect.go
+++ b/accounts/abi/reflect.go
@@ -17,7 +17,9 @@
 package abi

 import (
+	"errors"
 	"fmt"
+	"math/big"
 	"reflect"
 	"strings"
 )
@@ -25,46 +27,38 @@ import (
 // indirect recursively dereferences the value until it either gets the value
 // or finds a big.Int
 func indirect(v reflect.Value) reflect.Value {
-	if v.Kind() == reflect.Ptr && v.Elem().Type() != derefbigT {
+	if v.Kind() == reflect.Ptr && v.Elem().Type() != reflect.TypeOf(big.Int{}) {
 		return indirect(v.Elem())
 	}
 	return v
 }

-// indirectInterfaceOrPtr recursively dereferences the value until value is not interface.
-func indirectInterfaceOrPtr(v reflect.Value) reflect.Value {
-	if (v.Kind() == reflect.Interface || v.Kind() == reflect.Ptr) && v.Elem().IsValid() {
-		return indirect(v.Elem())
-	}
-	return v
-}
-
-// reflectIntKind returns the reflect using the given size and
+// reflectIntType returns the reflect using the given size and
 // unsignedness.
-func reflectIntKindAndType(unsigned bool, size int) (reflect.Kind, reflect.Type) {
+func reflectIntType(unsigned bool, size int) reflect.Type {
+	if unsigned {
+		switch size {
+		case 8:
+			return reflect.TypeOf(uint8(0))
+		case 16:
+			return reflect.TypeOf(uint16(0))
+		case 32:
+			return reflect.TypeOf(uint32(0))
+		case 64:
+			return reflect.TypeOf(uint64(0))
+		}
+	}
 	switch size {
 	case 8:
-		if unsigned {
-			return reflect.Uint8, uint8T
-		}
-		return reflect.Int8, int8T
+		return reflect.TypeOf(int8(0))
 	case 16:
-		if unsigned {
-			return reflect.Uint16, uint16T
-		}
-		return reflect.Int16, int16T
+		return reflect.TypeOf(int16(0))
 	case 32:
-		if unsigned {
-			return reflect.Uint32, uint32T
-		}
-		return reflect.Int32, int32T
+		return reflect.TypeOf(int32(0))
 	case 64:
-		if unsigned {
-			return reflect.Uint64, uint64T
-		}
-		return reflect.Int64, int64T
+		return reflect.TypeOf(int64(0))
 	}
-	return reflect.Ptr, bigT
+	return reflect.TypeOf(&big.Int{})
 }

 // mustArrayToBytesSlice creates a new byte slice with the exact same size as value
@@ -84,12 +78,16 @@ func set(dst, src reflect.Value) error {
 	switch {
 	case dstType.Kind() == reflect.Interface && dst.Elem().IsValid():
 		return set(dst.Elem(), src)
-	case dstType.Kind() == reflect.Ptr && dstType.Elem() != derefbigT:
+	case dstType.Kind() == reflect.Ptr && dstType.Elem() != reflect.TypeOf(big.Int{}):
 		return set(dst.Elem(), src)
 	case srcType.AssignableTo(dstType) && dst.CanSet():
 		dst.Set(src)
-	case dstType.Kind() == reflect.Slice && srcType.Kind() == reflect.Slice:
+	case dstType.Kind() == reflect.Slice && srcType.Kind() == reflect.Slice && dst.CanSet():
 		return setSlice(dst, src)
+	case dstType.Kind() == reflect.Array:
+		return setArray(dst, src)
+	case dstType.Kind() == reflect.Struct:
+		return setStruct(dst, src)
 	default:
 		return fmt.Errorf("abi: cannot unmarshal %v in to %v", src.Type(), dst.Type())
 	}
@@ -98,38 +96,56 @@ func set(dst, src reflect.Value) error {

 // setSlice attempts to assign src to dst when slices are not assignable by default
 // e.g. src: [][]byte -> dst: [][15]byte
+// setSlice ignores if we cannot copy all of src' elements.
 func setSlice(dst, src reflect.Value) error {
 	slice := reflect.MakeSlice(dst.Type(), src.Len(), src.Len())
 	for i := 0; i < src.Len(); i++ {
-		v := src.Index(i)
-		reflect.Copy(slice.Index(i), v)
-	}
-
-	dst.Set(slice)
-	return nil
-}
-
-// requireAssignable assures that `dest` is a pointer and it's not an interface.
-func requireAssignable(dst, src reflect.Value) error {
-	if dst.Kind() != reflect.Ptr && dst.Kind() != reflect.Interface {
-		return fmt.Errorf("abi: cannot unmarshal %v into %v", src.Type(), dst.Type())
-	}
-	return nil
-}
-
-// requireUnpackKind verifies preconditions for unpacking `args` into `kind`
-func requireUnpackKind(v reflect.Value, t reflect.Type, k reflect.Kind,
-	args Arguments) error {
-
-	switch k {
-	case reflect.Struct:
-	case reflect.Slice, reflect.Array:
-		if minLen := args.LengthNonIndexed(); v.Len() < minLen {
-			return fmt.Errorf("abi: insufficient number of elements in the list/array for unpack, want %d, got %d",
-				minLen, v.Len())
+		if src.Index(i).Kind() == reflect.Struct {
+			if err := set(slice.Index(i), src.Index(i)); err != nil {
+				return err
+			}
+		} else {
+			// e.g. [][32]uint8 to []common.Hash
+			if err := set(slice.Index(i), src.Index(i)); err != nil {
+				return err
+			}
+		}
+	}
+	if dst.CanSet() {
+		dst.Set(slice)
+		return nil
+	}
+	return errors.New("Cannot set slice, destination not settable")
+}
+
+func setArray(dst, src reflect.Value) error {
+	array := reflect.New(dst.Type()).Elem()
+	min := src.Len()
+	if src.Len() > dst.Len() {
+		min = dst.Len()
+	}
+	for i := 0; i < min; i++ {
+		if err := set(array.Index(i), src.Index(i)); err != nil {
+			return err
+		}
+	}
+	if dst.CanSet() {
+		dst.Set(array)
+		return nil
+	}
+	return errors.New("Cannot set array, destination not settable")
+}
+
+func setStruct(dst, src reflect.Value) error {
+	for i := 0; i < src.NumField(); i++ {
+		srcField := src.Field(i)
+		dstField := dst.Field(i)
+		if !dstField.IsValid() || !srcField.IsValid() {
+			return fmt.Errorf("Could not find src field: %v value: %v in destination", srcField.Type().Name(), srcField)
+		}
+		if err := set(dstField, srcField); err != nil {
+			return err
 		}
-	default:
-		return fmt.Errorf("abi: cannot unmarshal tuple into %v", t)
 	}
 	return nil
 }
@@ -156,9 +172,8 @@ func mapArgNamesToStructFields(argNames []string, value reflect.Value) (map[stri
 			continue
 		}
 		// skip fields that have no abi:"" tag.
-		var ok bool
-		var tagName string
-		if tagName, ok = typ.Field(i).Tag.Lookup("abi"); !ok {
+		tagName, ok := typ.Field(i).Tag.Lookup("abi")
+		if !ok {
 			continue
 		}
 		// check if tag is empty.
--- a/accounts/abi/topics.go
+++ b/accounts/abi/topics.go
@@ -0,0 +1,173 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package abi
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"math/big"
+	"reflect"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+// MakeTopics converts a filter query argument list into a filter topic set.
+func MakeTopics(query ...[]interface{}) ([][]common.Hash, error) {
+	topics := make([][]common.Hash, len(query))
+	for i, filter := range query {
+		for _, rule := range filter {
+			var topic common.Hash
+
+			// Try to generate the topic based on simple types
+			switch rule := rule.(type) {
+			case common.Hash:
+				copy(topic[:], rule[:])
+			case common.Address:
+				copy(topic[common.HashLength-common.AddressLength:], rule[:])
+			case *big.Int:
+				blob := rule.Bytes()
+				copy(topic[common.HashLength-len(blob):], blob)
+			case bool:
+				if rule {
+					topic[common.HashLength-1] = 1
+				}
+			case int8:
+				copy(topic[:], genIntType(int64(rule), 1))
+			case int16:
+				copy(topic[:], genIntType(int64(rule), 2))
+			case int32:
+				copy(topic[:], genIntType(int64(rule), 4))
+			case int64:
+				copy(topic[:], genIntType(rule, 8))
+			case uint8:
+				blob := new(big.Int).SetUint64(uint64(rule)).Bytes()
+				copy(topic[common.HashLength-len(blob):], blob)
+			case uint16:
+				blob := new(big.Int).SetUint64(uint64(rule)).Bytes()
+				copy(topic[common.HashLength-len(blob):], blob)
+			case uint32:
+				blob := new(big.Int).SetUint64(uint64(rule)).Bytes()
+				copy(topic[common.HashLength-len(blob):], blob)
+			case uint64:
+				blob := new(big.Int).SetUint64(rule).Bytes()
+				copy(topic[common.HashLength-len(blob):], blob)
+			case string:
+				hash := crypto.Keccak256Hash([]byte(rule))
+				copy(topic[:], hash[:])
+			case []byte:
+				hash := crypto.Keccak256Hash(rule)
+				copy(topic[:], hash[:])
+
+			default:
+				// todo(rjl493456442) according solidity documentation, indexed event
+				// parameters that are not value types i.e. arrays and structs are not
+				// stored directly but instead a keccak256-hash of an encoding is stored.
+				//
+				// We only convert stringS and bytes to hash, still need to deal with
+				// array(both fixed-size and dynamic-size) and struct.
+
+				// Attempt to generate the topic from funky types
+				val := reflect.ValueOf(rule)
+				switch {
+				// static byte array
+				case val.Kind() == reflect.Array && reflect.TypeOf(rule).Elem().Kind() == reflect.Uint8:
+					reflect.Copy(reflect.ValueOf(topic[:val.Len()]), val)
+				default:
+					return nil, fmt.Errorf("unsupported indexed type: %T", rule)
+				}
+			}
+			topics[i] = append(topics[i], topic)
+		}
+	}
+	return topics, nil
+}
+
+func genIntType(rule int64, size uint) []byte {
+	var topic [common.HashLength]byte
+	if rule < 0 {
+		// if a rule is negative, we need to put it into two's complement.
+		// extended to common.Hashlength bytes.
+		topic = [common.HashLength]byte{255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}
+	}
+	for i := uint(0); i < size; i++ {
+		topic[common.HashLength-i-1] = byte(rule >> (i * 8))
+	}
+	return topic[:]
+}
+
+// ParseTopics converts the indexed topic fields into actual log field values.
+func ParseTopics(out interface{}, fields Arguments, topics []common.Hash) error {
+	return parseTopicWithSetter(fields, topics,
+		func(arg Argument, reconstr interface{}) {
+			field := reflect.ValueOf(out).Elem().FieldByName(ToCamelCase(arg.Name))
+			field.Set(reflect.ValueOf(reconstr))
+		})
+}
+
+// ParseTopicsIntoMap converts the indexed topic field-value pairs into map key-value pairs
+func ParseTopicsIntoMap(out map[string]interface{}, fields Arguments, topics []common.Hash) error {
+	return parseTopicWithSetter(fields, topics,
+		func(arg Argument, reconstr interface{}) {
+			out[arg.Name] = reconstr
+		})
+}
+
+// parseTopicWithSetter converts the indexed topic field-value pairs and stores them using the
+// provided set function.
+//
+// Note, dynamic types cannot be reconstructed since they get mapped to Keccak256
+// hashes as the topic value!
+func parseTopicWithSetter(fields Arguments, topics []common.Hash, setter func(Argument, interface{})) error {
+	// Sanity check that the fields and topics match up
+	if len(fields) != len(topics) {
+		return errors.New("topic/field count mismatch")
+	}
+	// Iterate over all the fields and reconstruct them from topics
+	for i, arg := range fields {
+		if !arg.Indexed {
+			return errors.New("non-indexed field in topic reconstruction")
+		}
+		var reconstr interface{}
+		switch arg.Type.T {
+		case TupleTy:
+			return errors.New("tuple type in topic reconstruction")
+		case StringTy, BytesTy, SliceTy, ArrayTy:
+			// Array types (including strings and bytes) have their keccak256 hashes stored in the topic- not a hash
+			// whose bytes can be decoded to the actual value- so the best we can do is retrieve that hash
+			reconstr = topics[i]
+		case FunctionTy:
+			if garbage := binary.BigEndian.Uint64(topics[i][0:8]); garbage != 0 {
+				return fmt.Errorf("bind: got improperly encoded function type, got %v", topics[i].Bytes())
+			}
+			var tmp [24]byte
+			copy(tmp[:], topics[i][8:32])
+			reconstr = tmp
+		default:
+			var err error
+			reconstr, err = toGoType(0, arg.Type, topics[i].Bytes())
+			if err != nil {
+				return err
+			}
+		}
+		// Use the setter function to store the value
+		setter(arg, reconstr)
+	}
+
+	return nil
+}
--- a/accounts/abi/topics_test.go
+++ b/accounts/abi/topics_test.go
@@ -0,0 +1,381 @@
+// Copyright 2019 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package abi
+
+import (
+	"math/big"
+	"reflect"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+func TestMakeTopics(t *testing.T) {
+	type args struct {
+		query [][]interface{}
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    [][]common.Hash
+		wantErr bool
+	}{
+		{
+			"support fixed byte types, right padded to 32 bytes",
+			args{[][]interface{}{{[5]byte{1, 2, 3, 4, 5}}}},
+			[][]common.Hash{{common.Hash{1, 2, 3, 4, 5}}},
+			false,
+		},
+		{
+			"support common hash types in topics",
+			args{[][]interface{}{{common.Hash{1, 2, 3, 4, 5}}}},
+			[][]common.Hash{{common.Hash{1, 2, 3, 4, 5}}},
+			false,
+		},
+		{
+			"support address types in topics",
+			args{[][]interface{}{{common.Address{1, 2, 3, 4, 5}}}},
+			[][]common.Hash{{common.Hash{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5}}},
+			false,
+		},
+		{
+			"support *big.Int types in topics",
+			args{[][]interface{}{{big.NewInt(1).Lsh(big.NewInt(2), 254)}}},
+			[][]common.Hash{{common.Hash{128}}},
+			false,
+		},
+		{
+			"support boolean types in topics",
+			args{[][]interface{}{
+				{true},
+				{false},
+			}},
+			[][]common.Hash{
+				{common.Hash{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}},
+				{common.Hash{0}},
+			},
+			false,
+		},
+		{
+			"support int/uint(8/16/32/64) types in topics",
+			args{[][]interface{}{
+				{int8(-2)},
+				{int16(-3)},
+				{int32(-4)},
+				{int64(-5)},
+				{int8(1)},
+				{int16(256)},
+				{int32(65536)},
+				{int64(4294967296)},
+				{uint8(1)},
+				{uint16(256)},
+				{uint32(65536)},
+				{uint64(4294967296)},
+			}},
+			[][]common.Hash{
+				{common.Hash{255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 254}},
+				{common.Hash{255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 253}},
+				{common.Hash{255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 252}},
+				{common.Hash{255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 251}},
+				{common.Hash{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}},
+				{common.Hash{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0}},
+				{common.Hash{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0}},
+				{common.Hash{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0}},
+				{common.Hash{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}},
+				{common.Hash{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0}},
+				{common.Hash{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0}},
+				{common.Hash{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0}},
+			},
+			false,
+		},
+		{
+			"support string types in topics",
+			args{[][]interface{}{{"hello world"}}},
+			[][]common.Hash{{crypto.Keccak256Hash([]byte("hello world"))}},
+			false,
+		},
+		{
+			"support byte slice types in topics",
+			args{[][]interface{}{{[]byte{1, 2, 3}}}},
+			[][]common.Hash{{crypto.Keccak256Hash([]byte{1, 2, 3})}},
+			false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := MakeTopics(tt.args.query...)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("makeTopics() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("makeTopics() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+type args struct {
+	createObj func() interface{}
+	resultObj func() interface{}
+	resultMap func() map[string]interface{}
+	fields    Arguments
+	topics    []common.Hash
+}
+
+type bytesStruct struct {
+	StaticBytes [5]byte
+}
+type int8Struct struct {
+	Int8Value int8
+}
+type int256Struct struct {
+	Int256Value *big.Int
+}
+
+type hashStruct struct {
+	HashValue common.Hash
+}
+
+type funcStruct struct {
+	FuncValue [24]byte
+}
+
+type topicTest struct {
+	name    string
+	args    args
+	wantErr bool
+}
+
+func setupTopicsTests() []topicTest {
+	bytesType, _ := NewType("bytes5", "", nil)
+	int8Type, _ := NewType("int8", "", nil)
+	int256Type, _ := NewType("int256", "", nil)
+	tupleType, _ := NewType("tuple(int256,int8)", "", nil)
+	stringType, _ := NewType("string", "", nil)
+	funcType, _ := NewType("function", "", nil)
+
+	tests := []topicTest{
+		{
+			name: "support fixed byte types, right padded to 32 bytes",
+			args: args{
+				createObj: func() interface{} { return &bytesStruct{} },
+				resultObj: func() interface{} { return &bytesStruct{StaticBytes: [5]byte{1, 2, 3, 4, 5}} },
+				resultMap: func() map[string]interface{} {
+					return map[string]interface{}{"staticBytes": [5]byte{1, 2, 3, 4, 5}}
+				},
+				fields: Arguments{Argument{
+					Name:    "staticBytes",
+					Type:    bytesType,
+					Indexed: true,
+				}},
+				topics: []common.Hash{
+					{1, 2, 3, 4, 5},
+				},
+			},
+			wantErr: false,
+		},
+		{
+			name: "int8 with negative value",
+			args: args{
+				createObj: func() interface{} { return &int8Struct{} },
+				resultObj: func() interface{} { return &int8Struct{Int8Value: -1} },
+				resultMap: func() map[string]interface{} {
+					return map[string]interface{}{"int8Value": int8(-1)}
+				},
+				fields: Arguments{Argument{
+					Name:    "int8Value",
+					Type:    int8Type,
+					Indexed: true,
+				}},
+				topics: []common.Hash{
+					{255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+						255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255},
+				},
+			},
+			wantErr: false,
+		},
+		{
+			name: "int256 with negative value",
+			args: args{
+				createObj: func() interface{} { return &int256Struct{} },
+				resultObj: func() interface{} { return &int256Struct{Int256Value: big.NewInt(-1)} },
+				resultMap: func() map[string]interface{} {
+					return map[string]interface{}{"int256Value": big.NewInt(-1)}
+				},
+				fields: Arguments{Argument{
+					Name:    "int256Value",
+					Type:    int256Type,
+					Indexed: true,
+				}},
+				topics: []common.Hash{
+					{255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+						255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255},
+				},
+			},
+			wantErr: false,
+		},
+		{
+			name: "hash type",
+			args: args{
+				createObj: func() interface{} { return &hashStruct{} },
+				resultObj: func() interface{} { return &hashStruct{crypto.Keccak256Hash([]byte("stringtopic"))} },
+				resultMap: func() map[string]interface{} {
+					return map[string]interface{}{"hashValue": crypto.Keccak256Hash([]byte("stringtopic"))}
+				},
+				fields: Arguments{Argument{
+					Name:    "hashValue",
+					Type:    stringType,
+					Indexed: true,
+				}},
+				topics: []common.Hash{
+					crypto.Keccak256Hash([]byte("stringtopic")),
+				},
+			},
+			wantErr: false,
+		},
+		{
+			name: "function type",
+			args: args{
+				createObj: func() interface{} { return &funcStruct{} },
+				resultObj: func() interface{} {
+					return &funcStruct{[24]byte{255, 255, 255, 255, 255, 255, 255, 255,
+						255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}}
+				},
+				resultMap: func() map[string]interface{} {
+					return map[string]interface{}{"funcValue": [24]byte{255, 255, 255, 255, 255, 255, 255, 255,
+						255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}}
+				},
+				fields: Arguments{Argument{
+					Name:    "funcValue",
+					Type:    funcType,
+					Indexed: true,
+				}},
+				topics: []common.Hash{
+					{0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255,
+						255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255},
+				},
+			},
+			wantErr: false,
+		},
+		{
+			name: "error on topic/field count mismatch",
+			args: args{
+				createObj: func() interface{} { return nil },
+				resultObj: func() interface{} { return nil },
+				resultMap: func() map[string]interface{} { return make(map[string]interface{}) },
+				fields: Arguments{Argument{
+					Name:    "tupletype",
+					Type:    tupleType,
+					Indexed: true,
+				}},
+				topics: []common.Hash{},
+			},
+			wantErr: true,
+		},
+		{
+			name: "error on unindexed arguments",
+			args: args{
+				createObj: func() interface{} { return &int256Struct{} },
+				resultObj: func() interface{} { return &int256Struct{} },
+				resultMap: func() map[string]interface{} { return make(map[string]interface{}) },
+				fields: Arguments{Argument{
+					Name:    "int256Value",
+					Type:    int256Type,
+					Indexed: false,
+				}},
+				topics: []common.Hash{
+					{255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+						255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255},
+				},
+			},
+			wantErr: true,
+		},
+		{
+			name: "error on tuple in topic reconstruction",
+			args: args{
+				createObj: func() interface{} { return &tupleType },
+				resultObj: func() interface{} { return &tupleType },
+				resultMap: func() map[string]interface{} { return make(map[string]interface{}) },
+				fields: Arguments{Argument{
+					Name:    "tupletype",
+					Type:    tupleType,
+					Indexed: true,
+				}},
+				topics: []common.Hash{{0}},
+			},
+			wantErr: true,
+		},
+		{
+			name: "error on improper encoded function",
+			args: args{
+				createObj: func() interface{} { return &funcStruct{} },
+				resultObj: func() interface{} { return &funcStruct{} },
+				resultMap: func() map[string]interface{} {
+					return make(map[string]interface{})
+				},
+				fields: Arguments{Argument{
+					Name:    "funcValue",
+					Type:    funcType,
+					Indexed: true,
+				}},
+				topics: []common.Hash{
+					{0, 0, 0, 0, 0, 0, 0, 128, 255, 255, 255, 255, 255, 255, 255, 255,
+						255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255},
+				},
+			},
+			wantErr: true,
+		},
+	}
+
+	return tests
+}
+
+func TestParseTopics(t *testing.T) {
+	tests := setupTopicsTests()
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			createObj := tt.args.createObj()
+			if err := ParseTopics(createObj, tt.args.fields, tt.args.topics); (err != nil) != tt.wantErr {
+				t.Errorf("parseTopics() error = %v, wantErr %v", err, tt.wantErr)
+			}
+			resultObj := tt.args.resultObj()
+			if !reflect.DeepEqual(createObj, resultObj) {
+				t.Errorf("parseTopics() = %v, want %v", createObj, resultObj)
+			}
+		})
+	}
+}
+
+func TestParseTopicsIntoMap(t *testing.T) {
+	tests := setupTopicsTests()
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			outMap := make(map[string]interface{})
+			if err := ParseTopicsIntoMap(outMap, tt.args.fields, tt.args.topics); (err != nil) != tt.wantErr {
+				t.Errorf("parseTopicsIntoMap() error = %v, wantErr %v", err, tt.wantErr)
+			}
+			resultMap := tt.args.resultMap()
+			if !reflect.DeepEqual(outMap, resultMap) {
+				t.Errorf("parseTopicsIntoMap() = %v, want %v", outMap, resultMap)
+			}
+		})
+	}
+}
--- a/accounts/abi/type.go
+++ b/accounts/abi/type.go
@@ -23,6 +23,8 @@ import (
 	"regexp"
 	"strconv"
 	"strings"
+
+	"github.com/ethereum/go-ethereum/common"
 )

 // Type enumerator
@@ -45,17 +47,16 @@ const (
 // Type is the reflection of the supported argument type
 type Type struct {
 	Elem *Type
-	Kind reflect.Kind
-	Type reflect.Type
 	Size int
 	T    byte // Our own type checking

 	stringKind string // holds the unparsed string for deriving signatures

 	// Tuple relative fields
-	TupleRawName  string   // Raw struct name defined in source code, may be empty.
-	TupleElems    []*Type  // Type information of all tuple fields
-	TupleRawNames []string // Raw field name of all tuple fields
+	TupleRawName  string       // Raw struct name defined in source code, may be empty.
+	TupleElems    []*Type      // Type information of all tuple fields
+	TupleRawNames []string     // Raw field name of all tuple fields
+	TupleType     reflect.Type // Underlying struct of the tuple
 }

 var (
@@ -94,20 +95,16 @@ func NewType(t string, internalType string, components []ArgumentMarshaling) (ty
 		if len(intz) == 0 {
 			// is a slice
 			typ.T = SliceTy
-			typ.Kind = reflect.Slice
 			typ.Elem = &embeddedType
-			typ.Type = reflect.SliceOf(embeddedType.Type)
 			typ.stringKind = embeddedType.stringKind + sliced
 		} else if len(intz) == 1 {
-			// is a array
+			// is an array
 			typ.T = ArrayTy
-			typ.Kind = reflect.Array
 			typ.Elem = &embeddedType
 			typ.Size, err = strconv.Atoi(intz[0])
 			if err != nil {
 				return Type{}, fmt.Errorf("abi: error parsing variable size: %v", err)
 			}
-			typ.Type = reflect.ArrayOf(typ.Size, embeddedType.Type)
 			typ.stringKind = embeddedType.stringKind + sliced
 		} else {
 			return Type{}, fmt.Errorf("invalid formatting of array type")
@@ -139,36 +136,24 @@ func NewType(t string, internalType string, components []ArgumentMarshaling) (ty
 	// varType is the parsed abi type
 	switch varType := parsedType[1]; varType {
 	case "int":
-		typ.Kind, typ.Type = reflectIntKindAndType(false, varSize)
 		typ.Size = varSize
 		typ.T = IntTy
 	case "uint":
-		typ.Kind, typ.Type = reflectIntKindAndType(true, varSize)
 		typ.Size = varSize
 		typ.T = UintTy
 	case "bool":
-		typ.Kind = reflect.Bool
 		typ.T = BoolTy
-		typ.Type = reflect.TypeOf(bool(false))
 	case "address":
-		typ.Kind = reflect.Array
-		typ.Type = addressT
 		typ.Size = 20
 		typ.T = AddressTy
 	case "string":
-		typ.Kind = reflect.String
-		typ.Type = reflect.TypeOf("")
 		typ.T = StringTy
 	case "bytes":
 		if varSize == 0 {
 			typ.T = BytesTy
-			typ.Kind = reflect.Slice
-			typ.Type = reflect.SliceOf(reflect.TypeOf(byte(0)))
 		} else {
 			typ.T = FixedBytesTy
-			typ.Kind = reflect.Array
 			typ.Size = varSize
-			typ.Type = reflect.ArrayOf(varSize, reflect.TypeOf(byte(0)))
 		}
 	case "tuple":
 		var (
@@ -178,17 +163,20 @@ func NewType(t string, internalType string, components []ArgumentMarshaling) (ty
 			expression string // canonical parameter expression
 		)
 		expression += "("
+		overloadedNames := make(map[string]string)
 		for idx, c := range components {
 			cType, err := NewType(c.Type, c.InternalType, c.Components)
 			if err != nil {
 				return Type{}, err
 			}
-			if ToCamelCase(c.Name) == "" {
-				return Type{}, errors.New("abi: purely anonymous or underscored field is not supported")
+			fieldName, err := overloadedArgName(c.Name, overloadedNames)
+			if err != nil {
+				return Type{}, err
 			}
+			overloadedNames[fieldName] = fieldName
 			fields = append(fields, reflect.StructField{
-				Name: ToCamelCase(c.Name), // reflect.StructOf will panic for any exported field.
-				Type: cType.Type,
+				Name: fieldName, // reflect.StructOf will panic for any exported field.
+				Type: cType.GetType(),
 				Tag:  reflect.StructTag("json:\"" + c.Name + "\""),
 			})
 			elems = append(elems, &cType)
@@ -199,8 +187,8 @@ func NewType(t string, internalType string, components []ArgumentMarshaling) (ty
 			}
 		}
 		expression += ")"
-		typ.Kind = reflect.Struct
-		typ.Type = reflect.StructOf(fields)
+
+		typ.TupleType = reflect.StructOf(fields)
 		typ.TupleElems = elems
 		typ.TupleRawNames = names
 		typ.T = TupleTy
@@ -217,10 +205,8 @@ func NewType(t string, internalType string, components []ArgumentMarshaling) (ty
 		}

 	case "function":
-		typ.Kind = reflect.Array
 		typ.T = FunctionTy
 		typ.Size = 24
-		typ.Type = reflect.ArrayOf(24, reflect.TypeOf(byte(0)))
 	default:
 		return Type{}, fmt.Errorf("unsupported arg type: %s", t)
 	}
@@ -228,6 +214,56 @@ func NewType(t string, internalType string, components []ArgumentMarshaling) (ty
 	return
 }

+// GetType returns the reflection type of the ABI type.
+func (t Type) GetType() reflect.Type {
+	switch t.T {
+	case IntTy:
+		return reflectIntType(false, t.Size)
+	case UintTy:
+		return reflectIntType(true, t.Size)
+	case BoolTy:
+		return reflect.TypeOf(false)
+	case StringTy:
+		return reflect.TypeOf("")
+	case SliceTy:
+		return reflect.SliceOf(t.Elem.GetType())
+	case ArrayTy:
+		return reflect.ArrayOf(t.Size, t.Elem.GetType())
+	case TupleTy:
+		return t.TupleType
+	case AddressTy:
+		return reflect.TypeOf(common.Address{})
+	case FixedBytesTy:
+		return reflect.ArrayOf(t.Size, reflect.TypeOf(byte(0)))
+	case BytesTy:
+		return reflect.SliceOf(reflect.TypeOf(byte(0)))
+	case HashTy:
+		// hashtype currently not used
+		return reflect.ArrayOf(32, reflect.TypeOf(byte(0)))
+	case FixedPointTy:
+		// fixedpoint type currently not used
+		return reflect.ArrayOf(32, reflect.TypeOf(byte(0)))
+	case FunctionTy:
+		return reflect.ArrayOf(24, reflect.TypeOf(byte(0)))
+	default:
+		panic("Invalid type")
+	}
+}
+
+func overloadedArgName(rawName string, names map[string]string) (string, error) {
+	fieldName := ToCamelCase(rawName)
+	if fieldName == "" {
+		return "", errors.New("abi: purely anonymous or underscored field is not supported")
+	}
+	// Handle overloaded fieldNames
+	_, ok := names[fieldName]
+	for idx := 0; ok; idx++ {
+		fieldName = fmt.Sprintf("%s%d", ToCamelCase(rawName), idx)
+		_, ok = names[fieldName]
+	}
+	return fieldName, nil
+}
+
 // String implements Stringer
 func (t Type) String() (out string) {
 	return t.stringKind
--- a/accounts/abi/type_test.go
+++ b/accounts/abi/type_test.go
@@ -36,58 +36,58 @@ func TestTypeRegexp(t *testing.T) {
 		components []ArgumentMarshaling
 		kind       Type
 	}{
-		{"bool", nil, Type{Kind: reflect.Bool, T: BoolTy, Type: reflect.TypeOf(bool(false)), stringKind: "bool"}},
-		{"bool[]", nil, Type{Kind: reflect.Slice, T: SliceTy, Type: reflect.TypeOf([]bool(nil)), Elem: &Type{Kind: reflect.Bool, T: BoolTy, Type: reflect.TypeOf(bool(false)), stringKind: "bool"}, stringKind: "bool[]"}},
-		{"bool[2]", nil, Type{Size: 2, Kind: reflect.Array, T: ArrayTy, Type: reflect.TypeOf([2]bool{}), Elem: &Type{Kind: reflect.Bool, T: BoolTy, Type: reflect.TypeOf(bool(false)), stringKind: "bool"}, stringKind: "bool[2]"}},
-		{"bool[2][]", nil, Type{Kind: reflect.Slice, T: SliceTy, Type: reflect.TypeOf([][2]bool{}), Elem: &Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2]bool{}), Elem: &Type{Kind: reflect.Bool, T: BoolTy, Type: reflect.TypeOf(bool(false)), stringKind: "bool"}, stringKind: "bool[2]"}, stringKind: "bool[2][]"}},
-		{"bool[][]", nil, Type{Kind: reflect.Slice, T: SliceTy, Type: reflect.TypeOf([][]bool{}), Elem: &Type{Kind: reflect.Slice, T: SliceTy, Type: reflect.TypeOf([]bool{}), Elem: &Type{Kind: reflect.Bool, T: BoolTy, Type: reflect.TypeOf(bool(false)), stringKind: "bool"}, stringKind: "bool[]"}, stringKind: "bool[][]"}},
-		{"bool[][2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2][]bool{}), Elem: &Type{Kind: reflect.Slice, T: SliceTy, Type: reflect.TypeOf([]bool{}), Elem: &Type{Kind: reflect.Bool, T: BoolTy, Type: reflect.TypeOf(bool(false)), stringKind: "bool"}, stringKind: "bool[]"}, stringKind: "bool[][2]"}},
-		{"bool[2][2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2][2]bool{}), Elem: &Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2]bool{}), Elem: &Type{Kind: reflect.Bool, T: BoolTy, Type: reflect.TypeOf(bool(false)), stringKind: "bool"}, stringKind: "bool[2]"}, stringKind: "bool[2][2]"}},
-		{"bool[2][][2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2][][2]bool{}), Elem: &Type{Kind: reflect.Slice, T: SliceTy, Type: reflect.TypeOf([][2]bool{}), Elem: &Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2]bool{}), Elem: &Type{Kind: reflect.Bool, T: BoolTy, Type: reflect.TypeOf(bool(false)), stringKind: "bool"}, stringKind: "bool[2]"}, stringKind: "bool[2][]"}, stringKind: "bool[2][][2]"}},
-		{"bool[2][2][2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2][2][2]bool{}), Elem: &Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2][2]bool{}), Elem: &Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2]bool{}), Elem: &Type{Kind: reflect.Bool, T: BoolTy, Type: reflect.TypeOf(bool(false)), stringKind: "bool"}, stringKind: "bool[2]"}, stringKind: "bool[2][2]"}, stringKind: "bool[2][2][2]"}},
-		{"bool[][][]", nil, Type{T: SliceTy, Kind: reflect.Slice, Type: reflect.TypeOf([][][]bool{}), Elem: &Type{T: SliceTy, Kind: reflect.Slice, Type: reflect.TypeOf([][]bool{}), Elem: &Type{T: SliceTy, Kind: reflect.Slice, Type: reflect.TypeOf([]bool{}), Elem: &Type{Kind: reflect.Bool, T: BoolTy, Type: reflect.TypeOf(bool(false)), stringKind: "bool"}, stringKind: "bool[]"}, stringKind: "bool[][]"}, stringKind: "bool[][][]"}},
-		{"bool[][2][]", nil, Type{T: SliceTy, Kind: reflect.Slice, Type: reflect.TypeOf([][2][]bool{}), Elem: &Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2][]bool{}), Elem: &Type{T: SliceTy, Kind: reflect.Slice, Type: reflect.TypeOf([]bool{}), Elem: &Type{Kind: reflect.Bool, T: BoolTy, Type: reflect.TypeOf(bool(false)), stringKind: "bool"}, stringKind: "bool[]"}, stringKind: "bool[][2]"}, stringKind: "bool[][2][]"}},
-		{"int8", nil, Type{Kind: reflect.Int8, Type: int8T, Size: 8, T: IntTy, stringKind: "int8"}},
-		{"int16", nil, Type{Kind: reflect.Int16, Type: int16T, Size: 16, T: IntTy, stringKind: "int16"}},
-		{"int32", nil, Type{Kind: reflect.Int32, Type: int32T, Size: 32, T: IntTy, stringKind: "int32"}},
-		{"int64", nil, Type{Kind: reflect.Int64, Type: int64T, Size: 64, T: IntTy, stringKind: "int64"}},
-		{"int256", nil, Type{Kind: reflect.Ptr, Type: bigT, Size: 256, T: IntTy, stringKind: "int256"}},
-		{"int8[]", nil, Type{Kind: reflect.Slice, T: SliceTy, Type: reflect.TypeOf([]int8{}), Elem: &Type{Kind: reflect.Int8, Type: int8T, Size: 8, T: IntTy, stringKind: "int8"}, stringKind: "int8[]"}},
-		{"int8[2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2]int8{}), Elem: &Type{Kind: reflect.Int8, Type: int8T, Size: 8, T: IntTy, stringKind: "int8"}, stringKind: "int8[2]"}},
-		{"int16[]", nil, Type{Kind: reflect.Slice, T: SliceTy, Type: reflect.TypeOf([]int16{}), Elem: &Type{Kind: reflect.Int16, Type: int16T, Size: 16, T: IntTy, stringKind: "int16"}, stringKind: "int16[]"}},
-		{"int16[2]", nil, Type{Size: 2, Kind: reflect.Array, T: ArrayTy, Type: reflect.TypeOf([2]int16{}), Elem: &Type{Kind: reflect.Int16, Type: int16T, Size: 16, T: IntTy, stringKind: "int16"}, stringKind: "int16[2]"}},
-		{"int32[]", nil, Type{Kind: reflect.Slice, T: SliceTy, Type: reflect.TypeOf([]int32{}), Elem: &Type{Kind: reflect.Int32, Type: int32T, Size: 32, T: IntTy, stringKind: "int32"}, stringKind: "int32[]"}},
-		{"int32[2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2]int32{}), Elem: &Type{Kind: reflect.Int32, Type: int32T, Size: 32, T: IntTy, stringKind: "int32"}, stringKind: "int32[2]"}},
-		{"int64[]", nil, Type{Kind: reflect.Slice, T: SliceTy, Type: reflect.TypeOf([]int64{}), Elem: &Type{Kind: reflect.Int64, Type: int64T, Size: 64, T: IntTy, stringKind: "int64"}, stringKind: "int64[]"}},
-		{"int64[2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2]int64{}), Elem: &Type{Kind: reflect.Int64, Type: int64T, Size: 64, T: IntTy, stringKind: "int64"}, stringKind: "int64[2]"}},
-		{"int256[]", nil, Type{Kind: reflect.Slice, T: SliceTy, Type: reflect.TypeOf([]*big.Int{}), Elem: &Type{Kind: reflect.Ptr, Type: bigT, Size: 256, T: IntTy, stringKind: "int256"}, stringKind: "int256[]"}},
-		{"int256[2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2]*big.Int{}), Elem: &Type{Kind: reflect.Ptr, Type: bigT, Size: 256, T: IntTy, stringKind: "int256"}, stringKind: "int256[2]"}},
-		{"uint8", nil, Type{Kind: reflect.Uint8, Type: uint8T, Size: 8, T: UintTy, stringKind: "uint8"}},
-		{"uint16", nil, Type{Kind: reflect.Uint16, Type: uint16T, Size: 16, T: UintTy, stringKind: "uint16"}},
-		{"uint32", nil, Type{Kind: reflect.Uint32, Type: uint32T, Size: 32, T: UintTy, stringKind: "uint32"}},
-		{"uint64", nil, Type{Kind: reflect.Uint64, Type: uint64T, Size: 64, T: UintTy, stringKind: "uint64"}},
-		{"uint256", nil, Type{Kind: reflect.Ptr, Type: bigT, Size: 256, T: UintTy, stringKind: "uint256"}},
-		{"uint8[]", nil, Type{Kind: reflect.Slice, T: SliceTy, Type: reflect.TypeOf([]uint8{}), Elem: &Type{Kind: reflect.Uint8, Type: uint8T, Size: 8, T: UintTy, stringKind: "uint8"}, stringKind: "uint8[]"}},
-		{"uint8[2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2]uint8{}), Elem: &Type{Kind: reflect.Uint8, Type: uint8T, Size: 8, T: UintTy, stringKind: "uint8"}, stringKind: "uint8[2]"}},
-		{"uint16[]", nil, Type{T: SliceTy, Kind: reflect.Slice, Type: reflect.TypeOf([]uint16{}), Elem: &Type{Kind: reflect.Uint16, Type: uint16T, Size: 16, T: UintTy, stringKind: "uint16"}, stringKind: "uint16[]"}},
-		{"uint16[2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2]uint16{}), Elem: &Type{Kind: reflect.Uint16, Type: uint16T, Size: 16, T: UintTy, stringKind: "uint16"}, stringKind: "uint16[2]"}},
-		{"uint32[]", nil, Type{T: SliceTy, Kind: reflect.Slice, Type: reflect.TypeOf([]uint32{}), Elem: &Type{Kind: reflect.Uint32, Type: uint32T, Size: 32, T: UintTy, stringKind: "uint32"}, stringKind: "uint32[]"}},
-		{"uint32[2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2]uint32{}), Elem: &Type{Kind: reflect.Uint32, Type: uint32T, Size: 32, T: UintTy, stringKind: "uint32"}, stringKind: "uint32[2]"}},
-		{"uint64[]", nil, Type{T: SliceTy, Kind: reflect.Slice, Type: reflect.TypeOf([]uint64{}), Elem: &Type{Kind: reflect.Uint64, Type: uint64T, Size: 64, T: UintTy, stringKind: "uint64"}, stringKind: "uint64[]"}},
-		{"uint64[2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2]uint64{}), Elem: &Type{Kind: reflect.Uint64, Type: uint64T, Size: 64, T: UintTy, stringKind: "uint64"}, stringKind: "uint64[2]"}},
-		{"uint256[]", nil, Type{T: SliceTy, Kind: reflect.Slice, Type: reflect.TypeOf([]*big.Int{}), Elem: &Type{Kind: reflect.Ptr, Type: bigT, Size: 256, T: UintTy, stringKind: "uint256"}, stringKind: "uint256[]"}},
-		{"uint256[2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Type: reflect.TypeOf([2]*big.Int{}), Size: 2, Elem: &Type{Kind: reflect.Ptr, Type: bigT, Size: 256, T: UintTy, stringKind: "uint256"}, stringKind: "uint256[2]"}},
-		{"bytes32", nil, Type{Kind: reflect.Array, T: FixedBytesTy, Size: 32, Type: reflect.TypeOf([32]byte{}), stringKind: "bytes32"}},
-		{"bytes[]", nil, Type{T: SliceTy, Kind: reflect.Slice, Type: reflect.TypeOf([][]byte{}), Elem: &Type{Kind: reflect.Slice, Type: reflect.TypeOf([]byte{}), T: BytesTy, stringKind: "bytes"}, stringKind: "bytes[]"}},
-		{"bytes[2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2][]byte{}), Elem: &Type{T: BytesTy, Type: reflect.TypeOf([]byte{}), Kind: reflect.Slice, stringKind: "bytes"}, stringKind: "bytes[2]"}},
-		{"bytes32[]", nil, Type{T: SliceTy, Kind: reflect.Slice, Type: reflect.TypeOf([][32]byte{}), Elem: &Type{Kind: reflect.Array, Type: reflect.TypeOf([32]byte{}), T: FixedBytesTy, Size: 32, stringKind: "bytes32"}, stringKind: "bytes32[]"}},
-		{"bytes32[2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2][32]byte{}), Elem: &Type{Kind: reflect.Array, T: FixedBytesTy, Size: 32, Type: reflect.TypeOf([32]byte{}), stringKind: "bytes32"}, stringKind: "bytes32[2]"}},
-		{"string", nil, Type{Kind: reflect.String, T: StringTy, Type: reflect.TypeOf(""), stringKind: "string"}},
-		{"string[]", nil, Type{T: SliceTy, Kind: reflect.Slice, Type: reflect.TypeOf([]string{}), Elem: &Type{Kind: reflect.String, Type: reflect.TypeOf(""), T: StringTy, stringKind: "string"}, stringKind: "string[]"}},
-		{"string[2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2]string{}), Elem: &Type{Kind: reflect.String, T: StringTy, Type: reflect.TypeOf(""), stringKind: "string"}, stringKind: "string[2]"}},
-		{"address", nil, Type{Kind: reflect.Array, Type: addressT, Size: 20, T: AddressTy, stringKind: "address"}},
-		{"address[]", nil, Type{T: SliceTy, Kind: reflect.Slice, Type: reflect.TypeOf([]common.Address{}), Elem: &Type{Kind: reflect.Array, Type: addressT, Size: 20, T: AddressTy, stringKind: "address"}, stringKind: "address[]"}},
-		{"address[2]", nil, Type{Kind: reflect.Array, T: ArrayTy, Size: 2, Type: reflect.TypeOf([2]common.Address{}), Elem: &Type{Kind: reflect.Array, Type: addressT, Size: 20, T: AddressTy, stringKind: "address"}, stringKind: "address[2]"}},
+		{"bool", nil, Type{T: BoolTy, stringKind: "bool"}},
+		{"bool[]", nil, Type{T: SliceTy, Elem: &Type{T: BoolTy, stringKind: "bool"}, stringKind: "bool[]"}},
+		{"bool[2]", nil, Type{Size: 2, T: ArrayTy, Elem: &Type{T: BoolTy, stringKind: "bool"}, stringKind: "bool[2]"}},
+		{"bool[2][]", nil, Type{T: SliceTy, Elem: &Type{T: ArrayTy, Size: 2, Elem: &Type{T: BoolTy, stringKind: "bool"}, stringKind: "bool[2]"}, stringKind: "bool[2][]"}},
+		{"bool[][]", nil, Type{T: SliceTy, Elem: &Type{T: SliceTy, Elem: &Type{T: BoolTy, stringKind: "bool"}, stringKind: "bool[]"}, stringKind: "bool[][]"}},
+		{"bool[][2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{T: SliceTy, Elem: &Type{T: BoolTy, stringKind: "bool"}, stringKind: "bool[]"}, stringKind: "bool[][2]"}},
+		{"bool[2][2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{T: ArrayTy, Size: 2, Elem: &Type{T: BoolTy, stringKind: "bool"}, stringKind: "bool[2]"}, stringKind: "bool[2][2]"}},
+		{"bool[2][][2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{T: SliceTy, Elem: &Type{T: ArrayTy, Size: 2, Elem: &Type{T: BoolTy, stringKind: "bool"}, stringKind: "bool[2]"}, stringKind: "bool[2][]"}, stringKind: "bool[2][][2]"}},
+		{"bool[2][2][2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{T: ArrayTy, Size: 2, Elem: &Type{T: ArrayTy, Size: 2, Elem: &Type{T: BoolTy, stringKind: "bool"}, stringKind: "bool[2]"}, stringKind: "bool[2][2]"}, stringKind: "bool[2][2][2]"}},
+		{"bool[][][]", nil, Type{T: SliceTy, Elem: &Type{T: SliceTy, Elem: &Type{T: SliceTy, Elem: &Type{T: BoolTy, stringKind: "bool"}, stringKind: "bool[]"}, stringKind: "bool[][]"}, stringKind: "bool[][][]"}},
+		{"bool[][2][]", nil, Type{T: SliceTy, Elem: &Type{T: ArrayTy, Size: 2, Elem: &Type{T: SliceTy, Elem: &Type{T: BoolTy, stringKind: "bool"}, stringKind: "bool[]"}, stringKind: "bool[][2]"}, stringKind: "bool[][2][]"}},
+		{"int8", nil, Type{Size: 8, T: IntTy, stringKind: "int8"}},
+		{"int16", nil, Type{Size: 16, T: IntTy, stringKind: "int16"}},
+		{"int32", nil, Type{Size: 32, T: IntTy, stringKind: "int32"}},
+		{"int64", nil, Type{Size: 64, T: IntTy, stringKind: "int64"}},
+		{"int256", nil, Type{Size: 256, T: IntTy, stringKind: "int256"}},
+		{"int8[]", nil, Type{T: SliceTy, Elem: &Type{Size: 8, T: IntTy, stringKind: "int8"}, stringKind: "int8[]"}},
+		{"int8[2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{Size: 8, T: IntTy, stringKind: "int8"}, stringKind: "int8[2]"}},
+		{"int16[]", nil, Type{T: SliceTy, Elem: &Type{Size: 16, T: IntTy, stringKind: "int16"}, stringKind: "int16[]"}},
+		{"int16[2]", nil, Type{Size: 2, T: ArrayTy, Elem: &Type{Size: 16, T: IntTy, stringKind: "int16"}, stringKind: "int16[2]"}},
+		{"int32[]", nil, Type{T: SliceTy, Elem: &Type{Size: 32, T: IntTy, stringKind: "int32"}, stringKind: "int32[]"}},
+		{"int32[2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{Size: 32, T: IntTy, stringKind: "int32"}, stringKind: "int32[2]"}},
+		{"int64[]", nil, Type{T: SliceTy, Elem: &Type{Size: 64, T: IntTy, stringKind: "int64"}, stringKind: "int64[]"}},
+		{"int64[2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{Size: 64, T: IntTy, stringKind: "int64"}, stringKind: "int64[2]"}},
+		{"int256[]", nil, Type{T: SliceTy, Elem: &Type{Size: 256, T: IntTy, stringKind: "int256"}, stringKind: "int256[]"}},
+		{"int256[2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{Size: 256, T: IntTy, stringKind: "int256"}, stringKind: "int256[2]"}},
+		{"uint8", nil, Type{Size: 8, T: UintTy, stringKind: "uint8"}},
+		{"uint16", nil, Type{Size: 16, T: UintTy, stringKind: "uint16"}},
+		{"uint32", nil, Type{Size: 32, T: UintTy, stringKind: "uint32"}},
+		{"uint64", nil, Type{Size: 64, T: UintTy, stringKind: "uint64"}},
+		{"uint256", nil, Type{Size: 256, T: UintTy, stringKind: "uint256"}},
+		{"uint8[]", nil, Type{T: SliceTy, Elem: &Type{Size: 8, T: UintTy, stringKind: "uint8"}, stringKind: "uint8[]"}},
+		{"uint8[2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{Size: 8, T: UintTy, stringKind: "uint8"}, stringKind: "uint8[2]"}},
+		{"uint16[]", nil, Type{T: SliceTy, Elem: &Type{Size: 16, T: UintTy, stringKind: "uint16"}, stringKind: "uint16[]"}},
+		{"uint16[2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{Size: 16, T: UintTy, stringKind: "uint16"}, stringKind: "uint16[2]"}},
+		{"uint32[]", nil, Type{T: SliceTy, Elem: &Type{Size: 32, T: UintTy, stringKind: "uint32"}, stringKind: "uint32[]"}},
+		{"uint32[2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{Size: 32, T: UintTy, stringKind: "uint32"}, stringKind: "uint32[2]"}},
+		{"uint64[]", nil, Type{T: SliceTy, Elem: &Type{Size: 64, T: UintTy, stringKind: "uint64"}, stringKind: "uint64[]"}},
+		{"uint64[2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{Size: 64, T: UintTy, stringKind: "uint64"}, stringKind: "uint64[2]"}},
+		{"uint256[]", nil, Type{T: SliceTy, Elem: &Type{Size: 256, T: UintTy, stringKind: "uint256"}, stringKind: "uint256[]"}},
+		{"uint256[2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{Size: 256, T: UintTy, stringKind: "uint256"}, stringKind: "uint256[2]"}},
+		{"bytes32", nil, Type{T: FixedBytesTy, Size: 32, stringKind: "bytes32"}},
+		{"bytes[]", nil, Type{T: SliceTy, Elem: &Type{T: BytesTy, stringKind: "bytes"}, stringKind: "bytes[]"}},
+		{"bytes[2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{T: BytesTy, stringKind: "bytes"}, stringKind: "bytes[2]"}},
+		{"bytes32[]", nil, Type{T: SliceTy, Elem: &Type{T: FixedBytesTy, Size: 32, stringKind: "bytes32"}, stringKind: "bytes32[]"}},
+		{"bytes32[2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{T: FixedBytesTy, Size: 32, stringKind: "bytes32"}, stringKind: "bytes32[2]"}},
+		{"string", nil, Type{T: StringTy, stringKind: "string"}},
+		{"string[]", nil, Type{T: SliceTy, Elem: &Type{T: StringTy, stringKind: "string"}, stringKind: "string[]"}},
+		{"string[2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{T: StringTy, stringKind: "string"}, stringKind: "string[2]"}},
+		{"address", nil, Type{Size: 20, T: AddressTy, stringKind: "address"}},
+		{"address[]", nil, Type{T: SliceTy, Elem: &Type{Size: 20, T: AddressTy, stringKind: "address"}, stringKind: "address[]"}},
+		{"address[2]", nil, Type{T: ArrayTy, Size: 2, Elem: &Type{Size: 20, T: AddressTy, stringKind: "address"}, stringKind: "address[2]"}},
 		// TODO when fixed types are implemented properly
 		// {"fixed", nil, Type{}},
 		// {"fixed128x128", nil, Type{}},
@@ -95,14 +95,14 @@ func TestTypeRegexp(t *testing.T) {
 		// {"fixed[2]", nil, Type{}},
 		// {"fixed128x128[]", nil, Type{}},
 		// {"fixed128x128[2]", nil, Type{}},
-		{"tuple", []ArgumentMarshaling{{Name: "a", Type: "int64"}}, Type{Kind: reflect.Struct, T: TupleTy, Type: reflect.TypeOf(struct {
+		{"tuple", []ArgumentMarshaling{{Name: "a", Type: "int64"}}, Type{T: TupleTy, TupleType: reflect.TypeOf(struct {
 			A int64 `json:"a"`
 		}{}), stringKind: "(int64)",
-			TupleElems: []*Type{{Kind: reflect.Int64, T: IntTy, Type: reflect.TypeOf(int64(0)), Size: 64, stringKind: "int64"}}, TupleRawNames: []string{"a"}}},
-		{"tuple with long name", []ArgumentMarshaling{{Name: "aTypicalParamName", Type: "int64"}}, Type{Kind: reflect.Struct, T: TupleTy, Type: reflect.TypeOf(struct {
+			TupleElems: []*Type{{T: IntTy, Size: 64, stringKind: "int64"}}, TupleRawNames: []string{"a"}}},
+		{"tuple with long name", []ArgumentMarshaling{{Name: "aTypicalParamName", Type: "int64"}}, Type{T: TupleTy, TupleType: reflect.TypeOf(struct {
 			ATypicalParamName int64 `json:"aTypicalParamName"`
 		}{}), stringKind: "(int64)",
-			TupleElems: []*Type{{Kind: reflect.Int64, T: IntTy, Type: reflect.TypeOf(int64(0)), Size: 64, stringKind: "int64"}}, TupleRawNames: []string{"aTypicalParamName"}}},
+			TupleElems: []*Type{{T: IntTy, Size: 64, stringKind: "int64"}}, TupleRawNames: []string{"aTypicalParamName"}}},
 	}

 	for _, tt := range tests {
@@ -306,3 +306,27 @@ func TestTypeCheck(t *testing.T) {
 		}
 	}
 }
+
+func TestInternalType(t *testing.T) {
+	components := []ArgumentMarshaling{{Name: "a", Type: "int64"}}
+	internalType := "struct a.b[]"
+	kind := Type{
+		T: TupleTy,
+		TupleType: reflect.TypeOf(struct {
+			A int64 `json:"a"`
+		}{}),
+		stringKind:    "(int64)",
+		TupleRawName:  "ab[]",
+		TupleElems:    []*Type{{T: IntTy, Size: 64, stringKind: "int64"}},
+		TupleRawNames: []string{"a"},
+	}
+
+	blob := "tuple"
+	typ, err := NewType(blob, internalType, components)
+	if err != nil {
+		t.Errorf("type %q: failed to parse type string: %v", blob, err)
+	}
+	if !reflect.DeepEqual(typ, kind) {
+		t.Errorf("type %q: parsed type mismatch:\nGOT %s\nWANT %s ", blob, spew.Sdump(typeWithoutStringer(typ)), spew.Sdump(typeWithoutStringer(kind)))
+	}
+}
--- a/accounts/abi/unpack.go
+++ b/accounts/abi/unpack.go
@@ -26,45 +26,47 @@ import (
 )

 var (
-	maxUint256 = big.NewInt(0).Add(
-		big.NewInt(0).Exp(big.NewInt(2), big.NewInt(256), nil),
-		big.NewInt(-1))
-	maxInt256 = big.NewInt(0).Add(
-		big.NewInt(0).Exp(big.NewInt(2), big.NewInt(255), nil),
-		big.NewInt(-1))
+	// MaxUint256 is the maximum value that can be represented by a uint256
+	MaxUint256 = new(big.Int).Sub(new(big.Int).Lsh(common.Big1, 256), common.Big1)
+	// MaxInt256 is the maximum value that can be represented by a int256
+	MaxInt256 = new(big.Int).Sub(new(big.Int).Lsh(common.Big1, 255), common.Big1)
 )

-// reads the integer based on its kind
-func readInteger(typ byte, kind reflect.Kind, b []byte) interface{} {
-	switch kind {
-	case reflect.Uint8:
-		return b[len(b)-1]
-	case reflect.Uint16:
-		return binary.BigEndian.Uint16(b[len(b)-2:])
-	case reflect.Uint32:
-		return binary.BigEndian.Uint32(b[len(b)-4:])
-	case reflect.Uint64:
-		return binary.BigEndian.Uint64(b[len(b)-8:])
-	case reflect.Int8:
+// ReadInteger reads the integer based on its kind and returns the appropriate value
+func ReadInteger(typ Type, b []byte) interface{} {
+	if typ.T == UintTy {
+		switch typ.Size {
+		case 8:
+			return b[len(b)-1]
+		case 16:
+			return binary.BigEndian.Uint16(b[len(b)-2:])
+		case 32:
+			return binary.BigEndian.Uint32(b[len(b)-4:])
+		case 64:
+			return binary.BigEndian.Uint64(b[len(b)-8:])
+		default:
+			// the only case left for unsigned integer is uint256.
+			return new(big.Int).SetBytes(b)
+		}
+	}
+	switch typ.Size {
+	case 8:
 		return int8(b[len(b)-1])
-	case reflect.Int16:
+	case 16:
 		return int16(binary.BigEndian.Uint16(b[len(b)-2:]))
-	case reflect.Int32:
+	case 32:
 		return int32(binary.BigEndian.Uint32(b[len(b)-4:]))
-	case reflect.Int64:
+	case 64:
 		return int64(binary.BigEndian.Uint64(b[len(b)-8:]))
 	default:
-		// the only case lefts for integer is int256/uint256.
-		// big.SetBytes can't tell if a number is negative, positive on itself.
+		// the only case left for integer is int256
+		// big.SetBytes can't tell if a number is negative or positive in itself.
 		// On EVM, if the returned number > max int256, it is negative.
+		// A number is > max int256 if the bit at position 255 is set.
 		ret := new(big.Int).SetBytes(b)
-		if typ == UintTy {
-			return ret
-		}
-
-		if ret.Cmp(maxInt256) > 0 {
-			ret.Add(maxUint256, big.NewInt(0).Neg(ret))
-			ret.Add(ret, big.NewInt(1))
+		if ret.Bit(255) == 1 {
+			ret.Add(MaxUint256, new(big.Int).Neg(ret))
+			ret.Add(ret, common.Big1)
 			ret.Neg(ret)
 		}
 		return ret
@@ -102,13 +104,13 @@ func readFunctionType(t Type, word []byte) (funcTy [24]byte, err error) {
 	return
 }

-// through reflection, creates a fixed array to be read from
-func readFixedBytes(t Type, word []byte) (interface{}, error) {
+// ReadFixedBytes uses reflection to create a fixed array to be read from
+func ReadFixedBytes(t Type, word []byte) (interface{}, error) {
 	if t.T != FixedBytesTy {
 		return nil, fmt.Errorf("abi: invalid type in call to make fixed byte array")
 	}
 	// convert
-	array := reflect.New(t.Type).Elem()
+	array := reflect.New(t.GetType()).Elem()

 	reflect.Copy(array, reflect.ValueOf(word[0:t.Size]))
 	return array.Interface(), nil
@@ -129,10 +131,10 @@ func forEachUnpack(t Type, output []byte, start, size int) (interface{}, error)

 	if t.T == SliceTy {
 		// declare our slice
-		refSlice = reflect.MakeSlice(t.Type, size, size)
+		refSlice = reflect.MakeSlice(t.GetType(), size, size)
 	} else if t.T == ArrayTy {
 		// declare our array
-		refSlice = reflect.New(t.Type).Elem()
+		refSlice = reflect.New(t.GetType()).Elem()
 	} else {
 		return nil, fmt.Errorf("abi: invalid type in array/slice unpacking stage")
 	}
@@ -156,7 +158,7 @@ func forEachUnpack(t Type, output []byte, start, size int) (interface{}, error)
 }

 func forTupleUnpack(t Type, output []byte) (interface{}, error) {
-	retval := reflect.New(t.Type).Elem()
+	retval := reflect.New(t.GetType()).Elem()
 	virtualArgs := 0
 	for index, elem := range t.TupleElems {
 		marshalledValue, err := toGoType((index+virtualArgs)*32, *elem, output)
@@ -216,9 +218,8 @@ func toGoType(index int, t Type, output []byte) (interface{}, error) {
 				return nil, err
 			}
 			return forTupleUnpack(t, output[begin:])
-		} else {
-			return forTupleUnpack(t, output[index:])
 		}
+		return forTupleUnpack(t, output[index:])
 	case SliceTy:
 		return forEachUnpack(t, output[begin:], 0, length)
 	case ArrayTy:
@@ -230,7 +231,7 @@ func toGoType(index int, t Type, output []byte) (interface{}, error) {
 	case StringTy: // variable arrays are written at the end of the return bytes
 		return string(output[begin : begin+length]), nil
 	case IntTy, UintTy:
-		return readInteger(t.T, t.Kind, returnOutput), nil
+		return ReadInteger(t, returnOutput), nil
 	case BoolTy:
 		return readBool(returnOutput)
 	case AddressTy:
@@ -240,7 +241,7 @@ func toGoType(index int, t Type, output []byte) (interface{}, error) {
 	case BytesTy:
 		return output[begin : begin+length], nil
 	case FixedBytesTy:
-		return readFixedBytes(t, returnOutput)
+		return ReadFixedBytes(t, returnOutput)
 	case FunctionTy:
 		return readFunctionType(t, returnOutput)
 	default:
--- a/accounts/abi/unpack_test.go
+++ b/accounts/abi/unpack_test.go
@@ -30,6 +30,34 @@ import (
 	"github.com/stretchr/testify/require"
 )

+// TestUnpack tests the general pack/unpack tests in packing_test.go
+func TestUnpack(t *testing.T) {
+	for i, test := range packUnpackTests {
+		t.Run(strconv.Itoa(i)+" "+test.def, func(t *testing.T) {
+			//Unpack
+			def := fmt.Sprintf(`[{ "name" : "method", "type": "function", "outputs": %s}]`, test.def)
+			abi, err := JSON(strings.NewReader(def))
+			if err != nil {
+				t.Fatalf("invalid ABI definition %s: %v", def, err)
+			}
+			encb, err := hex.DecodeString(test.packed)
+			if err != nil {
+				t.Fatalf("invalid hex %s: %v", test.packed, err)
+			}
+			outptr := reflect.New(reflect.TypeOf(test.unpacked))
+			err = abi.Unpack(outptr.Interface(), "method", encb)
+			if err != nil {
+				t.Errorf("test %d (%v) failed: %v", i, test.def, err)
+				return
+			}
+			out := outptr.Elem().Interface()
+			if !reflect.DeepEqual(test.unpacked, out) {
+				t.Errorf("test %d (%v) failed: expected %v, got %v", i, test.def, test.unpacked, out)
+			}
+		})
+	}
+}
+
 type unpackTest struct {
 	def  string      // ABI definition JSON
 	enc  string      // evm return data
@@ -52,16 +80,6 @@ func (test unpackTest) checkError(err error) error {

 var unpackTests = []unpackTest{
 	// Bools
-	{
-		def:  `[{ "type": "bool" }]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000001",
-		want: true,
-	},
-	{
-		def:  `[{ "type": "bool" }]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000000",
-		want: false,
-	},
 	{
 		def:  `[{ "type": "bool" }]`,
 		enc:  "0000000000000000000000000000000000000000000000000001000000000001",
@@ -75,11 +93,6 @@ var unpackTests = []unpackTest{
 		err:  "abi: improperly encoded boolean value",
 	},
 	// Integers
-	{
-		def:  `[{"type": "uint32"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000001",
-		want: uint32(1),
-	},
 	{
 		def:  `[{"type": "uint32"}]`,
 		enc:  "0000000000000000000000000000000000000000000000000000000000000001",
@@ -92,16 +105,6 @@ var unpackTests = []unpackTest{
 		want: uint16(0),
 		err:  "abi: cannot unmarshal *big.Int in to uint16",
 	},
-	{
-		def:  `[{"type": "uint17"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000001",
-		want: big.NewInt(1),
-	},
-	{
-		def:  `[{"type": "int32"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000001",
-		want: int32(1),
-	},
 	{
 		def:  `[{"type": "int32"}]`,
 		enc:  "0000000000000000000000000000000000000000000000000000000000000001",
@@ -114,38 +117,10 @@ var unpackTests = []unpackTest{
 		want: int16(0),
 		err:  "abi: cannot unmarshal *big.Int in to int16",
 	},
-	{
-		def:  `[{"type": "int17"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000001",
-		want: big.NewInt(1),
-	},
-	{
-		def:  `[{"type": "int256"}]`,
-		enc:  "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
-		want: big.NewInt(-1),
-	},
-	// Address
-	{
-		def:  `[{"type": "address"}]`,
-		enc:  "0000000000000000000000000100000000000000000000000000000000000000",
-		want: common.Address{1},
-	},
-	// Bytes
-	{
-		def:  `[{"type": "bytes32"}]`,
-		enc:  "0100000000000000000000000000000000000000000000000000000000000000",
-		want: [32]byte{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
-	},
 	{
 		def:  `[{"type": "bytes"}]`,
 		enc:  "000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000200100000000000000000000000000000000000000000000000000000000000000",
-		want: common.Hex2Bytes("0100000000000000000000000000000000000000000000000000000000000000"),
-	},
-	{
-		def:  `[{"type": "bytes"}]`,
-		enc:  "000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000200100000000000000000000000000000000000000000000000000000000000000",
-		want: [32]byte{},
-		err:  "abi: cannot unmarshal []uint8 in to [32]uint8",
+		want: [32]byte{1},
 	},
 	{
 		def:  `[{"type": "bytes32"}]`,
@@ -153,245 +128,13 @@ var unpackTests = []unpackTest{
 		want: []byte(nil),
 		err:  "abi: cannot unmarshal [32]uint8 in to []uint8",
 	},
-	{
-		def:  `[{"type": "bytes32"}]`,
-		enc:  "0100000000000000000000000000000000000000000000000000000000000000",
-		want: [32]byte{1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
-	},
-	// Functions
-	{
-		def:  `[{"type": "function"}]`,
-		enc:  "0100000000000000000000000000000000000000000000000000000000000000",
-		want: [24]byte{1},
-	},
-	// Slice and Array
-	{
-		def:  `[{"type": "uint8[]"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: []uint8{1, 2},
-	},
-	{
-		def:  `[{"type": "uint8[]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000",
-		want: []uint8{},
-	},
-	{
-		def:  `[{"type": "uint256[]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000",
-		want: []*big.Int{},
-	},
-	{
-		def:  `[{"type": "uint8[2]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: [2]uint8{1, 2},
-	},
-	// multi dimensional, if these pass, all types that don't require length prefix should pass
-	{
-		def:  `[{"type": "uint8[][]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000",
-		want: [][]uint8{},
-	},
-	{
-		def:  `[{"type": "uint8[][]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: [][]uint8{{1, 2}, {1, 2}},
-	},
-	{
-		def:  `[{"type": "uint8[][]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003",
-		want: [][]uint8{{1, 2}, {1, 2, 3}},
-	},
-	{
-		def:  `[{"type": "uint8[2][2]"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: [2][2]uint8{{1, 2}, {1, 2}},
-	},
-	{
-		def:  `[{"type": "uint8[][2]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-		want: [2][]uint8{{}, {}},
-	},
-	{
-		def:  `[{"type": "uint8[][2]"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000001",
-		want: [2][]uint8{{1}, {1}},
-	},
-	{
-		def:  `[{"type": "uint8[2][]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000",
-		want: [][2]uint8{},
-	},
-	{
-		def:  `[{"type": "uint8[2][]"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: [][2]uint8{{1, 2}},
-	},
-	{
-		def:  `[{"type": "uint8[2][]"}]`,
-		enc:  "000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: [][2]uint8{{1, 2}, {1, 2}},
-	},
-	{
-		def:  `[{"type": "uint16[]"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: []uint16{1, 2},
-	},
-	{
-		def:  `[{"type": "uint16[2]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: [2]uint16{1, 2},
-	},
-	{
-		def:  `[{"type": "uint32[]"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: []uint32{1, 2},
-	},
-	{
-		def:  `[{"type": "uint32[2]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: [2]uint32{1, 2},
-	},
-	{
-		def:  `[{"type": "uint32[2][3][4]"}]`,
-		enc:  "000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000050000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000700000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000009000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000b000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000d000000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000f000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000110000000000000000000000000000000000000000000000000000000000000012000000000000000000000000000000000000000000000000000000000000001300000000000000000000000000000000000000000000000000000000000000140000000000000000000000000000000000000000000000000000000000000015000000000000000000000000000000000000000000000000000000000000001600000000000000000000000000000000000000000000000000000000000000170000000000000000000000000000000000000000000000000000000000000018",
-		want: [4][3][2]uint32{{{1, 2}, {3, 4}, {5, 6}}, {{7, 8}, {9, 10}, {11, 12}}, {{13, 14}, {15, 16}, {17, 18}}, {{19, 20}, {21, 22}, {23, 24}}},
-	},
-	{
-		def:  `[{"type": "uint64[]"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: []uint64{1, 2},
-	},
-	{
-		def:  `[{"type": "uint64[2]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: [2]uint64{1, 2},
-	},
-	{
-		def:  `[{"type": "uint256[]"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: []*big.Int{big.NewInt(1), big.NewInt(2)},
-	},
-	{
-		def:  `[{"type": "uint256[3]"}]`,
-		enc:  "000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003",
-		want: [3]*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)},
-	},
-	{
-		def:  `[{"type": "string[4]"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000140000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005576f726c64000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000b476f2d657468657265756d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008457468657265756d000000000000000000000000000000000000000000000000",
-		want: [4]string{"Hello", "World", "Go-ethereum", "Ethereum"},
-	},
-	{
-		def:  `[{"type": "string[]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000008457468657265756d000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000b676f2d657468657265756d000000000000000000000000000000000000000000",
-		want: []string{"Ethereum", "go-ethereum"},
-	},
-	{
-		def:  `[{"type": "bytes[]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000003f0f0f000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003f0f0f00000000000000000000000000000000000000000000000000000000000",
-		want: [][]byte{{0xf0, 0xf0, 0xf0}, {0xf0, 0xf0, 0xf0}},
-	},
-	{
-		def:  `[{"type": "uint256[2][][]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000c8000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000003e80000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000c8000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000003e8",
-		want: [][][2]*big.Int{{{big.NewInt(1), big.NewInt(200)}, {big.NewInt(1), big.NewInt(1000)}}, {{big.NewInt(1), big.NewInt(200)}, {big.NewInt(1), big.NewInt(1000)}}},
-	},
-	{
-		def:  `[{"type": "int8[]"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: []int8{1, 2},
-	},
-	{
-		def:  `[{"type": "int8[2]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: [2]int8{1, 2},
-	},
-	{
-		def:  `[{"type": "int16[]"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: []int16{1, 2},
-	},
-	{
-		def:  `[{"type": "int16[2]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: [2]int16{1, 2},
-	},
-	{
-		def:  `[{"type": "int32[]"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: []int32{1, 2},
-	},
-	{
-		def:  `[{"type": "int32[2]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: [2]int32{1, 2},
-	},
-	{
-		def:  `[{"type": "int64[]"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: []int64{1, 2},
-	},
-	{
-		def:  `[{"type": "int64[2]"}]`,
-		enc:  "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: [2]int64{1, 2},
-	},
-	{
-		def:  `[{"type": "int256[]"}]`,
-		enc:  "0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: []*big.Int{big.NewInt(1), big.NewInt(2)},
-	},
-	{
-		def:  `[{"type": "int256[3]"}]`,
-		enc:  "000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003",
-		want: [3]*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)},
-	},
-	// struct outputs
-	{
-		def: `[{"name":"int1","type":"int256"},{"name":"int2","type":"int256"}]`,
-		enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: struct {
-			Int1 *big.Int
-			Int2 *big.Int
-		}{big.NewInt(1), big.NewInt(2)},
-	},
-	{
-		def: `[{"name":"int_one","type":"int256"}]`,
-		enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: struct {
-			IntOne *big.Int
-		}{big.NewInt(1)},
-	},
-	{
-		def: `[{"name":"int__one","type":"int256"}]`,
-		enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: struct {
-			IntOne *big.Int
-		}{big.NewInt(1)},
-	},
-	{
-		def: `[{"name":"int_one_","type":"int256"}]`,
-		enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: struct {
-			IntOne *big.Int
-		}{big.NewInt(1)},
-	},
-	{
-		def: `[{"name":"int_one","type":"int256"}, {"name":"intone","type":"int256"}]`,
-		enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
-		want: struct {
-			IntOne *big.Int
-			Intone *big.Int
-		}{big.NewInt(1), big.NewInt(2)},
-	},
 	{
 		def: `[{"name":"___","type":"int256"}]`,
 		enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
 		want: struct {
 			IntOne *big.Int
 			Intone *big.Int
-		}{},
-		err: "abi: purely underscored output cannot unpack to struct",
+		}{IntOne: big.NewInt(1)},
 	},
 	{
 		def: `[{"name":"int_one","type":"int256"},{"name":"IntOne","type":"int256"}]`,
@@ -438,12 +181,37 @@ var unpackTests = []unpackTest{
 		}{},
 		err: "abi: purely underscored output cannot unpack to struct",
 	},
+	// Make sure only the first argument is consumed
+	{
+		def: `[{"name":"int_one","type":"int256"}]`,
+		enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
+		want: struct {
+			IntOne *big.Int
+		}{big.NewInt(1)},
+	},
+	{
+		def: `[{"name":"int__one","type":"int256"}]`,
+		enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
+		want: struct {
+			IntOne *big.Int
+		}{big.NewInt(1)},
+	},
+	{
+		def: `[{"name":"int_one_","type":"int256"}]`,
+		enc: "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002",
+		want: struct {
+			IntOne *big.Int
+		}{big.NewInt(1)},
+	},
 }

-func TestUnpack(t *testing.T) {
+// TestLocalUnpackTests runs test specially designed only for unpacking.
+// All test cases that can be used to test packing and unpacking should move to packing_test.go
+func TestLocalUnpackTests(t *testing.T) {
 	for i, test := range unpackTests {
 		t.Run(strconv.Itoa(i), func(t *testing.T) {
-			def := fmt.Sprintf(`[{ "name" : "method", "outputs": %s}]`, test.def)
+			//Unpack
+			def := fmt.Sprintf(`[{ "name" : "method", "type": "function", "outputs": %s}]`, test.def)
 			abi, err := JSON(strings.NewReader(def))
 			if err != nil {
 				t.Fatalf("invalid ABI definition %s: %v", def, err)
@@ -522,7 +290,7 @@ type methodMultiOutput struct {

 func methodMultiReturn(require *require.Assertions) (ABI, []byte, methodMultiOutput) {
 	const definition = `[
-	{ "name" : "multi", "constant" : false, "outputs": [ { "name": "Int", "type": "uint256" }, { "name": "String", "type": "string" } ] }]`
+	{ "name" : "multi", "type": "function", "outputs": [ { "name": "Int", "type": "uint256" }, { "name": "String", "type": "string" } ] }]`
 	var expected = methodMultiOutput{big.NewInt(1), "hello"}

 	abi, err := JSON(strings.NewReader(definition))
@@ -592,7 +360,7 @@ func TestMethodMultiReturn(t *testing.T) {
 	}, {
 		&[]interface{}{new(int)},
 		&[]interface{}{},
-		"abi: insufficient number of elements in the list/array for unpack, want 2, got 1",
+		"abi: insufficient number of arguments for unpack, want 2, got 1",
 		"Can not unpack into a slice with wrong types",
 	}}
 	for _, tc := range testCases {
@@ -611,7 +379,7 @@ func TestMethodMultiReturn(t *testing.T) {
 }

 func TestMultiReturnWithArray(t *testing.T) {
-	const definition = `[{"name" : "multi", "outputs": [{"type": "uint64[3]"}, {"type": "uint64"}]}]`
+	const definition = `[{"name" : "multi", "type": "function", "outputs": [{"type": "uint64[3]"}, {"type": "uint64"}]}]`
 	abi, err := JSON(strings.NewReader(definition))
 	if err != nil {
 		t.Fatal(err)
@@ -634,7 +402,7 @@ func TestMultiReturnWithArray(t *testing.T) {
 }

 func TestMultiReturnWithStringArray(t *testing.T) {
-	const definition = `[{"name" : "multi", "outputs": [{"name": "","type": "uint256[3]"},{"name": "","type": "address"},{"name": "","type": "string[2]"},{"name": "","type": "bool"}]}]`
+	const definition = `[{"name" : "multi", "type": "function", "outputs": [{"name": "","type": "uint256[3]"},{"name": "","type": "address"},{"name": "","type": "string[2]"},{"name": "","type": "bool"}]}]`
 	abi, err := JSON(strings.NewReader(definition))
 	if err != nil {
 		t.Fatal(err)
@@ -664,7 +432,7 @@ func TestMultiReturnWithStringArray(t *testing.T) {
 }

 func TestMultiReturnWithStringSlice(t *testing.T) {
-	const definition = `[{"name" : "multi", "outputs": [{"name": "","type": "string[]"},{"name": "","type": "uint256[]"}]}]`
+	const definition = `[{"name" : "multi", "type": "function", "outputs": [{"name": "","type": "string[]"},{"name": "","type": "uint256[]"}]}]`
 	abi, err := JSON(strings.NewReader(definition))
 	if err != nil {
 		t.Fatal(err)
@@ -700,7 +468,7 @@ func TestMultiReturnWithDeeplyNestedArray(t *testing.T) {
 	//  values of nested static arrays count towards the size as well, and any element following
 	//  after such nested array argument should be read with the correct offset,
 	//  so that it does not read content from the previous array argument.
-	const definition = `[{"name" : "multi", "outputs": [{"type": "uint64[3][2][4]"}, {"type": "uint64"}]}]`
+	const definition = `[{"name" : "multi", "type": "function", "outputs": [{"type": "uint64[3][2][4]"}, {"type": "uint64"}]}]`
 	abi, err := JSON(strings.NewReader(definition))
 	if err != nil {
 		t.Fatal(err)
@@ -737,15 +505,15 @@ func TestMultiReturnWithDeeplyNestedArray(t *testing.T) {

 func TestUnmarshal(t *testing.T) {
 	const definition = `[
-	{ "name" : "int", "constant" : false, "outputs": [ { "type": "uint256" } ] },
-	{ "name" : "bool", "constant" : false, "outputs": [ { "type": "bool" } ] },
-	{ "name" : "bytes", "constant" : false, "outputs": [ { "type": "bytes" } ] },
-	{ "name" : "fixed", "constant" : false, "outputs": [ { "type": "bytes32" } ] },
-	{ "name" : "multi", "constant" : false, "outputs": [ { "type": "bytes" }, { "type": "bytes" } ] },
-	{ "name" : "intArraySingle", "constant" : false, "outputs": [ { "type": "uint256[3]" } ] },
-	{ "name" : "addressSliceSingle", "constant" : false, "outputs": [ { "type": "address[]" } ] },
-	{ "name" : "addressSliceDouble", "constant" : false, "outputs": [ { "name": "a", "type": "address[]" }, { "name": "b", "type": "address[]" } ] },
-	{ "name" : "mixedBytes", "constant" : true, "outputs": [ { "name": "a", "type": "bytes" }, { "name": "b", "type": "bytes32" } ] }]`
+	{ "name" : "int", "type": "function", "outputs": [ { "type": "uint256" } ] },
+	{ "name" : "bool", "type": "function", "outputs": [ { "type": "bool" } ] },
+	{ "name" : "bytes", "type": "function", "outputs": [ { "type": "bytes" } ] },
+	{ "name" : "fixed", "type": "function", "outputs": [ { "type": "bytes32" } ] },
+	{ "name" : "multi", "type": "function", "outputs": [ { "type": "bytes" }, { "type": "bytes" } ] },
+	{ "name" : "intArraySingle", "type": "function", "outputs": [ { "type": "uint256[3]" } ] },
+	{ "name" : "addressSliceSingle", "type": "function", "outputs": [ { "type": "address[]" } ] },
+	{ "name" : "addressSliceDouble", "type": "function", "outputs": [ { "name": "a", "type": "address[]" }, { "name": "b", "type": "address[]" } ] },
+	{ "name" : "mixedBytes", "type": "function", "stateMutability" : "view", "outputs": [ { "name": "a", "type": "bytes" }, { "name": "b", "type": "bytes32" } ] }]`

 	abi, err := JSON(strings.NewReader(definition))
 	if err != nil {
@@ -985,7 +753,7 @@ func TestUnmarshal(t *testing.T) {
 }

 func TestUnpackTuple(t *testing.T) {
-	const simpleTuple = `[{"name":"tuple","constant":false,"outputs":[{"type":"tuple","name":"ret","components":[{"type":"int256","name":"a"},{"type":"int256","name":"b"}]}]}]`
+	const simpleTuple = `[{"name":"tuple","type":"function","outputs":[{"type":"tuple","name":"ret","components":[{"type":"int256","name":"a"},{"type":"int256","name":"b"}]}]}]`
 	abi, err := JSON(strings.NewReader(simpleTuple))
 	if err != nil {
 		t.Fatal(err)
@@ -1009,12 +777,12 @@ func TestUnpackTuple(t *testing.T) {
 			t.Errorf("unexpected value unpacked: want %x, got %x", 1, v.A)
 		}
 		if v.B.Cmp(big.NewInt(-1)) != 0 {
-			t.Errorf("unexpected value unpacked: want %x, got %x", v.B, -1)
+			t.Errorf("unexpected value unpacked: want %x, got %x", -1, v.B)
 		}
 	}

 	// Test nested tuple
-	const nestedTuple = `[{"name":"tuple","constant":false,"outputs":[
+	const nestedTuple = `[{"name":"tuple","type":"function","outputs":[
 		{"type":"tuple","name":"s","components":[{"type":"uint256","name":"a"},{"type":"uint256[]","name":"b"},{"type":"tuple[]","name":"c","components":[{"name":"x", "type":"uint256"},{"name":"y","type":"uint256"}]}]},
 		{"type":"tuple","name":"t","components":[{"name":"x", "type":"uint256"},{"name":"y","type":"uint256"}]},
 		{"type":"uint256","name":"a"}
@@ -1136,7 +904,7 @@ func TestOOMMaliciousInput(t *testing.T) {
 		},
 	}
 	for i, test := range oomTests {
-		def := fmt.Sprintf(`[{ "name" : "method", "outputs": %s}]`, test.def)
+		def := fmt.Sprintf(`[{ "name" : "method", "type": "function", "outputs": %s}]`, test.def)
 		abi, err := JSON(strings.NewReader(def))
 		if err != nil {
 			t.Fatalf("invalid ABI definition %s: %v", def, err)
--- a/accounts/accounts.go
+++ b/accounts/accounts.go
@@ -129,6 +129,8 @@ type Wallet interface {
 	// about which fields or actions are needed. The user may retry by providing
 	// the needed details via SignHashWithPassphrase, or by other means (e.g. unlock
 	// the account in a keystore).
+	//
+	// This method should return the signature in 'canonical' format, with v 0 or 1
 	SignText(account Account, text []byte) ([]byte, error)

 	// SignTextWithPassphrase is identical to Signtext, but also takes a password
--- a/accounts/external/backend.go
+++ b/accounts/external/backend.go
@@ -27,7 +27,6 @@ import (
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/event"
-	"github.com/ethereum/go-ethereum/internal/ethapi"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/ethereum/go-ethereum/signer/core"
@@ -131,6 +130,12 @@ func (api *ExternalSigner) Accounts() []accounts.Account {
 func (api *ExternalSigner) Contains(account accounts.Account) bool {
 	api.cacheMu.RLock()
 	defer api.cacheMu.RUnlock()
+	if api.cache == nil {
+		// If we haven't already fetched the accounts, it's time to do so now
+		api.cacheMu.RUnlock()
+		api.Accounts()
+		api.cacheMu.RLock()
+	}
 	for _, a := range api.cache {
 		if a.Address == account.Address && (account.URL == (accounts.URL{}) || account.URL == api.URL()) {
 			return true
@@ -161,7 +166,7 @@ func (api *ExternalSigner) SignData(account accounts.Account, mimeType string, d
 		hexutil.Encode(data)); err != nil {
 		return nil, err
 	}
-	// If V is on 27/28-form, convert to to 0/1 for Clique
+	// If V is on 27/28-form, convert to 0/1 for Clique
 	if mimeType == accounts.MimetypeClique && (res[64] == 27 || res[64] == 28) {
 		res[64] -= 27 // Transform V from 27/28 to 0/1 for Clique use
 	}
@@ -169,19 +174,29 @@ func (api *ExternalSigner) SignData(account accounts.Account, mimeType string, d
 }

 func (api *ExternalSigner) SignText(account accounts.Account, text []byte) ([]byte, error) {
-	var res hexutil.Bytes
+	var signature hexutil.Bytes
 	var signAddress = common.NewMixedcaseAddress(account.Address)
-	if err := api.client.Call(&res, "account_signData",
+	if err := api.client.Call(&signature, "account_signData",
 		accounts.MimetypeTextPlain,
 		&signAddress, // Need to use the pointer here, because of how MarshalJSON is defined
 		hexutil.Encode(text)); err != nil {
 		return nil, err
 	}
-	return res, nil
+	if signature[64] == 27 || signature[64] == 28 {
+		// If clef is used as a backend, it may already have transformed
+		// the signature to ethereum-type signature.
+		signature[64] -= 27 // Transform V from Ethereum-legacy to 0/1
+	}
+	return signature, nil
+}
+
+// signTransactionResult represents the signinig result returned by clef.
+type signTransactionResult struct {
+	Raw hexutil.Bytes      `json:"raw"`
+	Tx  *types.Transaction `json:"tx"`
 }

 func (api *ExternalSigner) SignTx(account accounts.Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) {
-	res := ethapi.SignTransactionResult{}
 	data := hexutil.Bytes(tx.Data())
 	var to *common.MixedcaseAddress
 	if tx.To() != nil {
@@ -197,6 +212,7 @@ func (api *ExternalSigner) SignTx(account accounts.Account, tx *types.Transactio
 		To:       to,
 		From:     common.NewMixedcaseAddress(account.Address),
 	}
+	var res signTransactionResult
 	if err := api.client.Call(&res, "account_signTransaction", args); err != nil {
 		return nil, err
 	}
--- a/accounts/hd_test.go
+++ b/accounts/hd_test.go
@@ -61,7 +61,7 @@ func TestHDPathParsing(t *testing.T) {
 		// Weird inputs just to ensure they work
 		{"	m  /   44			'\n/\n   60	\n\n\t'   /\n0 ' /\t\t	0", DerivationPath{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0}},

-		// Invaid derivation paths
+		// Invalid derivation paths
 		{"", nil},              // Empty relative derivation path
 		{"m", nil},             // Empty absolute derivation path
 		{"m/", nil},            // Missing last derivation component
--- a/accounts/keystore/keystore.go
+++ b/accounts/keystore/keystore.go
@@ -24,7 +24,6 @@ import (
 	"crypto/ecdsa"
 	crand "crypto/rand"
 	"errors"
-	"fmt"
 	"math/big"
 	"os"
 	"path/filepath"
@@ -44,6 +43,10 @@ var (
 	ErrLocked  = accounts.NewAuthNeededError("password or unlock")
 	ErrNoMatch = errors.New("no key for given address or file")
 	ErrDecrypt = errors.New("could not decrypt key with given password")
+
+	// ErrAccountAlreadyExists is returned if an account attempted to import is
+	// already present in the keystore.
+	ErrAccountAlreadyExists = errors.New("account already exists")
 )

 // KeyStoreType is the reflect type of a keystore backend.
@@ -67,7 +70,8 @@ type KeyStore struct {
 	updateScope event.SubscriptionScope // Subscription scope tracking current live listeners
 	updating    bool                    // Whether the event notification loop is running

-	mu sync.RWMutex
+	mu       sync.RWMutex
+	importMu sync.Mutex // Import Mutex locks the import to prevent two insertions from racing
 }

 type unlocked struct {
@@ -443,14 +447,27 @@ func (ks *KeyStore) Import(keyJSON []byte, passphrase, newPassphrase string) (ac
 	if err != nil {
 		return accounts.Account{}, err
 	}
+	ks.importMu.Lock()
+	defer ks.importMu.Unlock()
+
+	if ks.cache.hasAddress(key.Address) {
+		return accounts.Account{
+			Address: key.Address,
+		}, ErrAccountAlreadyExists
+	}
 	return ks.importKey(key, newPassphrase)
 }

 // ImportECDSA stores the given key into the key directory, encrypting it with the passphrase.
 func (ks *KeyStore) ImportECDSA(priv *ecdsa.PrivateKey, passphrase string) (accounts.Account, error) {
+	ks.importMu.Lock()
+	defer ks.importMu.Unlock()
+
 	key := newKeyFromECDSA(priv)
 	if ks.cache.hasAddress(key.Address) {
-		return accounts.Account{}, fmt.Errorf("account already exists")
+		return accounts.Account{
+			Address: key.Address,
+		}, ErrAccountAlreadyExists
 	}
 	return ks.importKey(key, passphrase)
 }
--- a/accounts/keystore/keystore_test.go
+++ b/accounts/keystore/keystore_test.go
@@ -23,11 +23,14 @@ import (
 	"runtime"
 	"sort"
 	"strings"
+	"sync"
+	"sync/atomic"
 	"testing"
 	"time"

 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/event"
 )

@@ -338,6 +341,88 @@ func TestWalletNotifications(t *testing.T) {
 	checkEvents(t, wantEvents, events)
 }

+// TestImportExport tests the import functionality of a keystore.
+func TestImportECDSA(t *testing.T) {
+	dir, ks := tmpKeyStore(t, true)
+	defer os.RemoveAll(dir)
+	key, err := crypto.GenerateKey()
+	if err != nil {
+		t.Fatalf("failed to generate key: %v", key)
+	}
+	if _, err = ks.ImportECDSA(key, "old"); err != nil {
+		t.Errorf("importing failed: %v", err)
+	}
+	if _, err = ks.ImportECDSA(key, "old"); err == nil {
+		t.Errorf("importing same key twice succeeded")
+	}
+	if _, err = ks.ImportECDSA(key, "new"); err == nil {
+		t.Errorf("importing same key twice succeeded")
+	}
+}
+
+// TestImportECDSA tests the import and export functionality of a keystore.
+func TestImportExport(t *testing.T) {
+	dir, ks := tmpKeyStore(t, true)
+	defer os.RemoveAll(dir)
+	acc, err := ks.NewAccount("old")
+	if err != nil {
+		t.Fatalf("failed to create account: %v", acc)
+	}
+	json, err := ks.Export(acc, "old", "new")
+	if err != nil {
+		t.Fatalf("failed to export account: %v", acc)
+	}
+	dir2, ks2 := tmpKeyStore(t, true)
+	defer os.RemoveAll(dir2)
+	if _, err = ks2.Import(json, "old", "old"); err == nil {
+		t.Errorf("importing with invalid password succeeded")
+	}
+	acc2, err := ks2.Import(json, "new", "new")
+	if err != nil {
+		t.Errorf("importing failed: %v", err)
+	}
+	if acc.Address != acc2.Address {
+		t.Error("imported account does not match exported account")
+	}
+	if _, err = ks2.Import(json, "new", "new"); err == nil {
+		t.Errorf("importing a key twice succeeded")
+	}
+
+}
+
+// TestImportRace tests the keystore on races.
+// This test should fail under -race if importing races.
+func TestImportRace(t *testing.T) {
+	dir, ks := tmpKeyStore(t, true)
+	defer os.RemoveAll(dir)
+	acc, err := ks.NewAccount("old")
+	if err != nil {
+		t.Fatalf("failed to create account: %v", acc)
+	}
+	json, err := ks.Export(acc, "old", "new")
+	if err != nil {
+		t.Fatalf("failed to export account: %v", acc)
+	}
+	dir2, ks2 := tmpKeyStore(t, true)
+	defer os.RemoveAll(dir2)
+	var atom uint32
+	var wg sync.WaitGroup
+	wg.Add(2)
+	for i := 0; i < 2; i++ {
+		go func() {
+			defer wg.Done()
+			if _, err := ks2.Import(json, "new", "new"); err != nil {
+				atomic.AddUint32(&atom, 1)
+			}
+
+		}()
+	}
+	wg.Wait()
+	if atom != 1 {
+		t.Errorf("Import is racy")
+	}
+}
+
 // checkAccounts checks that all known live accounts are present in the wallet list.
 func checkAccounts(t *testing.T, live map[common.Address]accounts.Account, wallets []accounts.Wallet) {
 	if len(live) != len(wallets) {
--- a/accounts/manager.go
+++ b/accounts/manager.go
@@ -141,6 +141,11 @@ func (am *Manager) Wallets() []Wallet {
 	am.lock.RLock()
 	defer am.lock.RUnlock()

+	return am.walletsNoLock()
+}
+
+// walletsNoLock returns all registered wallets. Callers must hold am.lock.
+func (am *Manager) walletsNoLock() []Wallet {
 	cpy := make([]Wallet, len(am.wallets))
 	copy(cpy, am.wallets)
 	return cpy
@@ -155,7 +160,7 @@ func (am *Manager) Wallet(url string) (Wallet, error) {
 	if err != nil {
 		return nil, err
 	}
-	for _, wallet := range am.Wallets() {
+	for _, wallet := range am.walletsNoLock() {
 		if wallet.URL() == parsed {
 			return wallet, nil
 		}
--- a/accounts/scwallet/hub.go
+++ b/accounts/scwallet/hub.go
@@ -220,7 +220,7 @@ func (hub *Hub) refreshWallets() {
 		// Mark the reader as present
 		seen[reader] = struct{}{}

-		// If we alreay know about this card, skip to the next reader, otherwise clean up
+		// If we already know about this card, skip to the next reader, otherwise clean up
 		if wallet, ok := hub.wallets[reader]; ok {
 			if err := wallet.ping(); err == nil {
 				continue
--- a/accounts/scwallet/securechannel.go
+++ b/accounts/scwallet/securechannel.go
@@ -71,7 +71,7 @@ func NewSecureChannelSession(card *pcsc.Card, keyData []byte) (*SecureChannelSes

 	cardPublic, ok := gen.Unmarshal(keyData)
 	if !ok {
-		return nil, fmt.Errorf("Could not unmarshal public key from card")
+		return nil, fmt.Errorf("could not unmarshal public key from card")
 	}

 	secret, err := gen.GenerateSharedSecret(private, cardPublic)
@@ -109,7 +109,7 @@ func (s *SecureChannelSession) Pair(pairingPassword []byte) error {
 	cardChallenge := response.Data[32:64]

 	if !bytes.Equal(expectedCryptogram, cardCryptogram) {
-		return fmt.Errorf("Invalid card cryptogram %v != %v", expectedCryptogram, cardCryptogram)
+		return fmt.Errorf("invalid card cryptogram %v != %v", expectedCryptogram, cardCryptogram)
 	}

 	md.Reset()
@@ -132,7 +132,7 @@ func (s *SecureChannelSession) Pair(pairingPassword []byte) error {
 // Unpair disestablishes an existing pairing.
 func (s *SecureChannelSession) Unpair() error {
 	if s.PairingKey == nil {
-		return fmt.Errorf("Cannot unpair: not paired")
+		return fmt.Errorf("cannot unpair: not paired")
 	}

 	_, err := s.transmitEncrypted(claSCWallet, insUnpair, s.PairingIndex, 0, []byte{})
@@ -148,7 +148,7 @@ func (s *SecureChannelSession) Unpair() error {
 // Open initializes the secure channel.
 func (s *SecureChannelSession) Open() error {
 	if s.iv != nil {
-		return fmt.Errorf("Session already opened")
+		return fmt.Errorf("session already opened")
 	}

 	response, err := s.open()
@@ -185,11 +185,11 @@ func (s *SecureChannelSession) mutuallyAuthenticate() error {
 		return err
 	}
 	if response.Sw1 != 0x90 || response.Sw2 != 0x00 {
-		return fmt.Errorf("Got unexpected response from MUTUALLY_AUTHENTICATE: 0x%x%x", response.Sw1, response.Sw2)
+		return fmt.Errorf("got unexpected response from MUTUALLY_AUTHENTICATE: 0x%x%x", response.Sw1, response.Sw2)
 	}

 	if len(response.Data) != scSecretLength {
-		return fmt.Errorf("Response from MUTUALLY_AUTHENTICATE was %d bytes, expected %d", len(response.Data), scSecretLength)
+		return fmt.Errorf("response from MUTUALLY_AUTHENTICATE was %d bytes, expected %d", len(response.Data), scSecretLength)
 	}

 	return nil
@@ -222,7 +222,7 @@ func (s *SecureChannelSession) pair(p1 uint8, data []byte) (*responseAPDU, error
 // transmitEncrypted sends an encrypted message, and decrypts and returns the response.
 func (s *SecureChannelSession) transmitEncrypted(cla, ins, p1, p2 byte, data []byte) (*responseAPDU, error) {
 	if s.iv == nil {
-		return nil, fmt.Errorf("Channel not open")
+		return nil, fmt.Errorf("channel not open")
 	}

 	data, err := s.encryptAPDU(data)
@@ -261,14 +261,14 @@ func (s *SecureChannelSession) transmitEncrypted(cla, ins, p1, p2 byte, data []b
 		return nil, err
 	}
 	if !bytes.Equal(s.iv, rmac) {
-		return nil, fmt.Errorf("Invalid MAC in response")
+		return nil, fmt.Errorf("invalid MAC in response")
 	}

 	rapdu := &responseAPDU{}
 	rapdu.deserialize(plainData)

 	if rapdu.Sw1 != sw1Ok {
-		return nil, fmt.Errorf("Unexpected response status Cla=0x%x, Ins=0x%x, Sw=0x%x%x", cla, ins, rapdu.Sw1, rapdu.Sw2)
+		return nil, fmt.Errorf("unexpected response status Cla=0x%x, Ins=0x%x, Sw=0x%x%x", cla, ins, rapdu.Sw1, rapdu.Sw2)
 	}

 	return rapdu, nil
@@ -277,7 +277,7 @@ func (s *SecureChannelSession) transmitEncrypted(cla, ins, p1, p2 byte, data []b
 // encryptAPDU is an internal method that serializes and encrypts an APDU.
 func (s *SecureChannelSession) encryptAPDU(data []byte) ([]byte, error) {
 	if len(data) > maxPayloadSize {
-		return nil, fmt.Errorf("Payload of %d bytes exceeds maximum of %d", len(data), maxPayloadSize)
+		return nil, fmt.Errorf("payload of %d bytes exceeds maximum of %d", len(data), maxPayloadSize)
 	}
 	data = pad(data, 0x80)

@@ -323,10 +323,10 @@ func unpad(data []byte, terminator byte) ([]byte, error) {
 		case terminator:
 			return data[:len(data)-i], nil
 		default:
-			return nil, fmt.Errorf("Expected end of padding, got %d", data[len(data)-i])
+			return nil, fmt.Errorf("expected end of padding, got %d", data[len(data)-i])
 		}
 	}
-	return nil, fmt.Errorf("Expected end of padding, got 0")
+	return nil, fmt.Errorf("expected end of padding, got 0")
 }

 // updateIV is an internal method that updates the initialization vector after
--- a/accounts/scwallet/wallet.go
+++ b/accounts/scwallet/wallet.go
@@ -167,7 +167,7 @@ func transmit(card *pcsc.Card, command *commandAPDU) (*responseAPDU, error) {
 	}

 	if response.Sw1 != sw1Ok {
-		return nil, fmt.Errorf("Unexpected insecure response status Cla=0x%x, Ins=0x%x, Sw=0x%x%x", command.Cla, command.Ins, response.Sw1, response.Sw2)
+		return nil, fmt.Errorf("unexpected insecure response status Cla=0x%x, Ins=0x%x, Sw=0x%x%x", command.Cla, command.Ins, response.Sw1, response.Sw2)
 	}

 	return response, nil
@@ -252,7 +252,7 @@ func (w *Wallet) release() error {
 // with the wallet.
 func (w *Wallet) pair(puk []byte) error {
 	if w.session.paired() {
-		return fmt.Errorf("Wallet already paired")
+		return fmt.Errorf("wallet already paired")
 	}
 	pairing, err := w.session.pair(puk)
 	if err != nil {
@@ -312,15 +312,15 @@ func (w *Wallet) Status() (string, error) {
 	}
 	switch {
 	case !w.session.verified && status.PinRetryCount == 0 && status.PukRetryCount == 0:
-		return fmt.Sprintf("Bricked, waiting for full wipe"), nil
+		return "Bricked, waiting for full wipe", nil
 	case !w.session.verified && status.PinRetryCount == 0:
 		return fmt.Sprintf("Blocked, waiting for PUK (%d attempts left) and new PIN", status.PukRetryCount), nil
 	case !w.session.verified:
 		return fmt.Sprintf("Locked, waiting for PIN (%d attempts left)", status.PinRetryCount), nil
 	case !status.Initialized:
-		return fmt.Sprintf("Empty, waiting for initialization"), nil
+		return "Empty, waiting for initialization", nil
 	default:
-		return fmt.Sprintf("Online"), nil
+		return "Online", nil
 	}
 }

@@ -362,7 +362,7 @@ func (w *Wallet) Open(passphrase string) error {
 				return err
 			}
 			// Pairing succeeded, fall through to PIN checks. This will of course fail,
-			// but we can't return ErrPINNeeded directly here becase we don't know whether
+			// but we can't return ErrPINNeeded directly here because we don't know whether
 			// a PIN check or a PIN reset is needed.
 			passphrase = ""
 		}
@@ -773,12 +773,12 @@ func (w *Wallet) findAccountPath(account accounts.Account) (accounts.DerivationP

 	// Look for the path in the URL
 	if account.URL.Scheme != w.Hub.scheme {
-		return nil, fmt.Errorf("Scheme %s does not match wallet scheme %s", account.URL.Scheme, w.Hub.scheme)
+		return nil, fmt.Errorf("scheme %s does not match wallet scheme %s", account.URL.Scheme, w.Hub.scheme)
 	}

 	parts := strings.SplitN(account.URL.Path, "/", 2)
 	if len(parts) != 2 {
-		return nil, fmt.Errorf("Invalid URL format: %s", account.URL)
+		return nil, fmt.Errorf("invalid URL format: %s", account.URL)
 	}

 	if parts[0] != fmt.Sprintf("%x", w.PublicKey[1:3]) {
@@ -813,7 +813,7 @@ func (s *Session) pair(secret []byte) (smartcardPairing, error) {
 // unpair deletes an existing pairing.
 func (s *Session) unpair() error {
 	if !s.verified {
-		return fmt.Errorf("Unpair requires that the PIN be verified")
+		return fmt.Errorf("unpair requires that the PIN be verified")
 	}
 	return s.Channel.Unpair()
 }
@@ -850,7 +850,7 @@ func (s *Session) paired() bool {
 // authenticate uses an existing pairing to establish a secure channel.
 func (s *Session) authenticate(pairing smartcardPairing) error {
 	if !bytes.Equal(s.Wallet.PublicKey, pairing.PublicKey) {
-		return fmt.Errorf("Cannot pair using another wallet's pairing; %x != %x", s.Wallet.PublicKey, pairing.PublicKey)
+		return fmt.Errorf("cannot pair using another wallet's pairing; %x != %x", s.Wallet.PublicKey, pairing.PublicKey)
 	}
 	s.Channel.PairingKey = pairing.PairingKey
 	s.Channel.PairingIndex = pairing.PairingIndex
@@ -879,6 +879,7 @@ func (s *Session) walletStatus() (*walletStatus, error) {
 }

 // derivationPath fetches the wallet's current derivation path from the card.
+//lint:ignore U1000 needs to be added to the console interface
 func (s *Session) derivationPath() (accounts.DerivationPath, error) {
 	response, err := s.Channel.transmitEncrypted(claSCWallet, insStatus, statusP1Path, 0, nil)
 	if err != nil {
@@ -993,12 +994,14 @@ func (s *Session) derive(path accounts.DerivationPath) (accounts.Account, error)
 }

 // keyExport contains information on an exported keypair.
+//lint:ignore U1000 needs to be added to the console interface
 type keyExport struct {
 	PublicKey  []byte `asn1:"tag:0"`
 	PrivateKey []byte `asn1:"tag:1,optional"`
 }

 // publicKey returns the public key for the current derivation path.
+//lint:ignore U1000 needs to be added to the console interface
 func (s *Session) publicKey() ([]byte, error) {
 	response, err := s.Channel.transmitEncrypted(claSCWallet, insExportKey, exportP1Any, exportP2Pubkey, nil)
 	if err != nil {
--- a/accounts/usbwallet/ledger.go
+++ b/accounts/usbwallet/ledger.go
@@ -162,7 +162,8 @@ func (w *ledgerDriver) SignTx(path accounts.DerivationPath, tx *types.Transactio
 		return common.Address{}, nil, accounts.ErrWalletClosed
 	}
 	// Ensure the wallet is capable of signing the given transaction
-	if chainID != nil && w.version[0] <= 1 && w.version[1] <= 0 && w.version[2] <= 2 {
+	if chainID != nil && w.version[0] <= 1 && w.version[2] <= 2 {
+		//lint:ignore ST1005 brand name displayed on the console
 		return common.Address{}, nil, fmt.Errorf("Ledger v%d.%d.%d doesn't support signing this transaction, please update to v1.0.3 at least", w.version[0], w.version[1], w.version[2])
 	}
 	// All infos gathered and metadata checks out, request signing
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -6,6 +6,7 @@ clone_depth: 5
 version: "{branch}.{build}"
 environment:
  global:
+    GO111MODULE: on
    GOPATH: C:\gopath
    CC: gcc.exe
  matrix:
@@ -23,8 +24,8 @@ environment:
 install:
  - git submodule update --init
  - rmdir C:\go /s /q
-  - appveyor DownloadFile https://dl.google.com/go/go1.13.4.windows-%GETH_ARCH%.zip
-  - 7z x go1.13.4.windows-%GETH_ARCH%.zip -y -oC:\ > NUL
+  - appveyor DownloadFile https://dl.google.com/go/go1.14.2.windows-%GETH_ARCH%.zip
+  - 7z x go1.14.2.windows-%GETH_ARCH%.zip -y -oC:\ > NUL
  - go version
  - gcc --version

--- a/build/checksums.txt
+++ b/build/checksums.txt
@@ -1,19 +1,20 @@
 # This file contains sha256 checksums of optional build dependencies.

-95dbeab442ee2746b9acf0934c8e2fc26414a0565c008631b04addb8c02e7624  go1.13.4.src.tar.gz
+98de84e69726a66da7b4e58eac41b99cbe274d7e8906eeb8a5b7eb0aadee7f7c  go1.14.2.src.tar.gz

-1fcbc9e36f4319eeed02beb8cfd1b3d425ffc2f90ddf09a80f18d5064c51e0cb  golangci-lint-1.21.0-linux-386.tar.gz
-267b4066e67139a38d29499331a002d6a29ad5be7aafc83db3b1e88f1b027f90  golangci-lint-1.21.0-linux-armv6.tar.gz
-a602c1f25f90e46e621019cff0a8cb3f4e1837011f3537f15e730d6a9ebf507b  golangci-lint-1.21.0-freebsd-armv7.tar.gz
-2c861f8dc56b560474aa27cab0c075991628cc01af3451e27ac82f5d10d5106b  golangci-lint-1.21.0-linux-amd64.tar.gz
-a1c39e055280e755acaa906e7abfc20b99a5c28be8af541c57fbc44abbb20dde  golangci-lint-1.21.0-linux-arm64.tar.gz
-a8f8bda8c6a4136acf858091077830b1e83ad5612606cb69d5dced869ce00bd8  golangci-lint-1.21.0-linux-ppc64le.tar.gz
-0a8a8c3bc660ccbca668897ab520f7ee9878f16cc8e4dd24fe46236ceec97ba3  golangci-lint-1.21.0-freebsd-armv6.tar.gz
-699b07f45e216571f54002bcbd83b511c4801464a422162158e299587b095b18  golangci-lint-1.21.0-freebsd-amd64.tar.gz
-980fb4993942154bb5c8129ea3b86de09574fe81b24384ebb58cd7a9d2f04483  golangci-lint-1.21.0-linux-armv7.tar.gz
-f15b689088a47f20d5d3c1d945e9ee7c6238f2b84ea468b5f886cf8713dce62e  golangci-lint-1.21.0-windows-386.zip
-2e40ded7adcf11e59013cb15c24438b15a86526ca241edfcfdf1abd73a5280a8  golangci-lint-1.21.0-windows-amd64.zip
-6052c7cfea4d6dc2fc722f6c12792a5ec087420198db495afffbc22052653bf7  golangci-lint-1.21.0-freebsd-386.tar.gz
-ca00b8eacf9af14a71b908b4149606c762aa5c0eac781e74ca0abedfdfdf6c8c  golangci-lint-1.21.0-linux-s390x.tar.gz
-1365455940c342f95718159d89d66ad2eef19f0846c3e87023e915a3527b929f  golangci-lint-1.21.0-darwin-386.tar.gz
-2b2713ec5007e67883aa501eebb81f22abfab0cf0909134ba90f60a066db3760  golangci-lint-1.21.0-darwin-amd64.tar.gz
+d998a84eea42f2271aca792a7b027ca5c1edfcba229e8e5a844c9ac3f336df35  golangci-lint-1.27.0-linux-armv7.tar.gz
+bf781f05b0d393b4bf0a327d9e62926949a4f14d7774d950c4e009fc766ed1d4  golangci-lint.exe-1.27.0-windows-amd64.zip
+bf781f05b0d393b4bf0a327d9e62926949a4f14d7774d950c4e009fc766ed1d4  golangci-lint-1.27.0-windows-amd64.zip
+0e2a57d6ba709440d3ed018ef1037465fa010ed02595829092860e5cf863042e  golangci-lint-1.27.0-freebsd-386.tar.gz
+90205fc42ab5ed0096413e790d88ac9b4ed60f4c47e576d13dc0660f7ed4b013  golangci-lint-1.27.0-linux-arm64.tar.gz
+8d345e4e88520e21c113d81978e89ad77fc5b13bfdf20e5bca86b83fc4261272  golangci-lint-1.27.0-linux-amd64.tar.gz
+cc619634a77f18dc73df2a0725be13116d64328dc35131ca1737a850d6f76a59  golangci-lint-1.27.0-freebsd-armv7.tar.gz
+fe683583cfc9eeec83e498c0d6159d87b5e1919dbe4b6c3b3913089642906069  golangci-lint-1.27.0-linux-s390x.tar.gz
+058f5579bee75bdaacbaf75b75e1369f7ad877fd8b3b145aed17a17545de913e  golangci-lint-1.27.0-freebsd-armv6.tar.gz
+38e1e3dadbe3f56ab62b4de82ee0b88e8fad966d8dfd740a26ef94c2edef9818  golangci-lint-1.27.0-linux-armv6.tar.gz
+071b34af5516f4e1ddcaea6011e18208f4f043e1af8ba21eeccad4585cb3d095  golangci-lint.exe-1.27.0-windows-386.zip
+071b34af5516f4e1ddcaea6011e18208f4f043e1af8ba21eeccad4585cb3d095  golangci-lint-1.27.0-windows-386.zip
+5f37e2b33914ecddb7cad38186ef4ec61d88172fc04f930fa0267c91151ff306  golangci-lint-1.27.0-linux-386.tar.gz
+4d94cfb51fdebeb205f1d5a349ac2b683c30591c5150708073c1c329e15965f0  golangci-lint-1.27.0-freebsd-amd64.tar.gz
+52572ba8ff07d5169c2365d3de3fec26dc55a97522094d13d1596199580fa281  golangci-lint-1.27.0-linux-ppc64le.tar.gz
+3fb1a1683a29c6c0a8cd76135f62b606fbdd538d5a7aeab94af1af70ffdc2fd4  golangci-lint-1.27.0-darwin-amd64.tar.gz
--- a/build/ci.go
+++ b/build/ci.go
@@ -145,6 +145,7 @@ var (
 		"bionic": "golang-go",
 		"disco":  "golang-go",
 		"eoan":   "golang-go",
+		"focal":  "golang-go",
 	}

 	debGoBootPaths = map[string]string{
@@ -214,9 +215,9 @@ func doInstall(cmdline []string) {
 		var minor int
 		fmt.Sscanf(strings.TrimPrefix(runtime.Version(), "go1."), "%d", &minor)

-		if minor < 9 {
+		if minor < 11 {
 			log.Println("You have Go version", runtime.Version())
-			log.Println("go-ethereum requires at least Go version 1.9 and cannot")
+			log.Println("go-ethereum requires at least Go version 1.11 and cannot")
 			log.Println("be compiled with an earlier version. Please upgrade your Go installation.")
 			os.Exit(1)
 		}
@@ -237,13 +238,6 @@ func doInstall(cmdline []string) {
 		build.MustRun(goinstall)
 		return
 	}
-	// If we are cross compiling to ARMv5 ARMv6 or ARMv7, clean any previous builds
-	if *arch == "arm" {
-		os.RemoveAll(filepath.Join(runtime.GOROOT(), "pkg", runtime.GOOS+"_arm"))
-		for _, path := range filepath.SplitList(build.GOPATH()) {
-			os.RemoveAll(filepath.Join(path, "pkg", runtime.GOOS+"_arm"))
-		}
-	}

 	// Seems we are cross compiling, work around forbidden GOBIN
 	goinstall := goToolArch(*arch, *cc, "install", buildFlags(env)...)
@@ -294,7 +288,6 @@ func goTool(subcmd string, args ...string) *exec.Cmd {

 func goToolArch(arch string, cc string, subcmd string, args ...string) *exec.Cmd {
 	cmd := build.GoTool(subcmd, args...)
-	cmd.Env = []string{"GOPATH=" + build.GOPATH()}
 	if arch == "" || arch == runtime.GOARCH {
 		cmd.Env = append(cmd.Env, "GOBIN="+GOBIN)
 	} else {
@@ -305,7 +298,7 @@ func goToolArch(arch string, cc string, subcmd string, args ...string) *exec.Cmd
 		cmd.Env = append(cmd.Env, "CC="+cc)
 	}
 	for _, e := range os.Environ() {
-		if strings.HasPrefix(e, "GOPATH=") || strings.HasPrefix(e, "GOBIN=") {
+		if strings.HasPrefix(e, "GOBIN=") {
 			continue
 		}
 		cmd.Env = append(cmd.Env, e)
@@ -332,7 +325,7 @@ func doTest(cmdline []string) {
 	// Test a single package at a time. CI builders are slow
 	// and some tests run into timeouts under load.
 	gotest := goTool("test", buildFlags(env)...)
-	gotest.Args = append(gotest.Args, "-p", "1", "-timeout", "5m")
+	gotest.Args = append(gotest.Args, "-p", "1")
 	if *coverage {
 		gotest.Args = append(gotest.Args, "-covermode=atomic", "-cover")
 	}
@@ -363,7 +356,7 @@ func doLint(cmdline []string) {

 // downloadLinter downloads and unpacks golangci-lint.
 func downloadLinter(cachedir string) string {
-	const version = "1.21.0"
+	const version = "1.27.0"

 	csdb := build.MustLoadChecksums("build/checksums.txt")
 	base := fmt.Sprintf("golangci-lint-%s-%s-%s", version, runtime.GOOS, runtime.GOARCH)
@@ -888,7 +881,6 @@ func gomobileTool(subcmd string, args ...string) *exec.Cmd {
 	cmd := exec.Command(filepath.Join(GOBIN, "gomobile"), subcmd)
 	cmd.Args = append(cmd.Args, args...)
 	cmd.Env = []string{
-		"GOPATH=" + build.GOPATH(),
 		"PATH=" + GOBIN + string(os.PathListSeparator) + os.Getenv("PATH"),
 	}
 	for _, e := range os.Environ() {
@@ -1078,7 +1070,6 @@ func xgoTool(args []string) *exec.Cmd {
 	cmd := exec.Command(filepath.Join(GOBIN, "xgo"), args...)
 	cmd.Env = os.Environ()
 	cmd.Env = append(cmd.Env, []string{
-		"GOPATH=" + build.GOPATH(),
 		"GOBIN=" + GOBIN,
 	}...)
 	return cmd
@@ -1107,6 +1098,8 @@ func doPurge(cmdline []string) {
 	if err != nil {
 		log.Fatal(err)
 	}
+	fmt.Printf("Found %d blobs\n", len(blobs))
+
 	// Iterate over the blobs, collect and sort all unstable builds
 	for i := 0; i < len(blobs); i++ {
 		if !strings.Contains(blobs[i].Name, "unstable") {
@@ -1128,6 +1121,7 @@ func doPurge(cmdline []string) {
 			break
 		}
 	}
+	fmt.Printf("Deleting %d blobs\n", len(blobs))
 	// Delete all marked as such and return
 	if err := build.AzureBlobstoreDelete(auth, blobs); err != nil {
 		log.Fatal(err)
--- a/build/deb/ethereum/deb.rules
+++ b/build/deb/ethereum/deb.rules
@@ -6,6 +6,7 @@

 # Launchpad rejects Go's access to $HOME, use custom folders
 export GOCACHE=/tmp/go-build
+export GOPATH=/tmp/gopath
 export GOROOT_BOOTSTRAP={{.GoBootPath}}

 override_dh_auto_clean:
@@ -19,10 +20,11 @@ override_dh_auto_build:

 	# We can't download external go modules within Launchpad, so we're shipping the
 	# entire dependency source cache with go-ethereum.
-	(mkdir -p build/_workspace/pkg/mod && mv .mod/* build/_workspace/pkg/mod)
+	mkdir -p $(GOPATH)/pkg
+	mv .mod $(GOPATH)/pkg/mod

 	# A fresh Go was built, all dependency downloads faked, hope build works now
-	build/env.sh ../.go/bin/go run build/ci.go install -git-commit={{.Env.Commit}} -git-branch={{.Env.Branch}} -git-tag={{.Env.Tag}} -buildnum={{.Env.Buildnum}} -pull-request={{.Env.IsPullRequest}}
+	../.go/bin/go run build/ci.go install -git-commit={{.Env.Commit}} -git-branch={{.Env.Branch}} -git-tag={{.Env.Tag}} -buildnum={{.Env.Buildnum}} -pull-request={{.Env.IsPullRequest}}

 override_dh_auto_test:

--- a/build/env.sh
+++ b/build/env.sh
@@ -1,30 +0,0 @@
-#!/bin/sh
-
-set -e
-
-if [ ! -f "build/env.sh" ]; then
-    echo "$0 must be run from the root of the repository."
-    exit 2
-fi
-
-# Create fake Go workspace if it doesn't exist yet.
-workspace="$PWD/build/_workspace"
-root="$PWD"
-ethdir="$workspace/src/github.com/ethereum"
-if [ ! -L "$ethdir/go-ethereum" ]; then
-    mkdir -p "$ethdir"
-    cd "$ethdir"
-    ln -s ../../../../../. go-ethereum
-    cd "$root"
-fi
-
-# Set up the environment to use the workspace.
-GOPATH="$workspace"
-export GOPATH
-
-# Run the command inside the workspace.
-cd "$ethdir/go-ethereum"
-PWD="$ethdir/go-ethereum"
-
-# Launch the arguments with the configured environment.
-exec "$@"
--- a/build/nsis.install.nsh
+++ b/build/nsis.install.nsh
@@ -19,9 +19,9 @@ Section "Geth" GETH_IDX

  # Create start menu launcher
  createDirectory "$SMPROGRAMS\${APPNAME}"
-  createShortCut "$SMPROGRAMS\${APPNAME}\${APPNAME}.lnk" "$INSTDIR\geth.exe" "--fast" "--cache=512"
-  createShortCut "$SMPROGRAMS\${APPNAME}\Attach.lnk" "$INSTDIR\geth.exe" "attach" "" ""
-  createShortCut "$SMPROGRAMS\${APPNAME}\Uninstall.lnk" "$INSTDIR\uninstall.exe" "" "" ""
+  createShortCut "$SMPROGRAMS\${APPNAME}\${APPNAME}.lnk" "$INSTDIR\geth.exe"
+  createShortCut "$SMPROGRAMS\${APPNAME}\Attach.lnk" "$INSTDIR\geth.exe" "attach"
+  createShortCut "$SMPROGRAMS\${APPNAME}\Uninstall.lnk" "$INSTDIR\uninstall.exe"

  # Firewall - remove rules (if exists)
  SimpleFC::AdvRemoveRule "Geth incoming peers (TCP:30303)"
--- a/cmd/abidump/main.go
+++ b/cmd/abidump/main.go
@@ -0,0 +1,74 @@
+// Copyright 2019 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"encoding/hex"
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/signer/core"
+	"github.com/ethereum/go-ethereum/signer/fourbyte"
+)
+
+func init() {
+	flag.Usage = func() {
+		fmt.Fprintln(os.Stderr, "Usage:", os.Args[0], "<hexdata>")
+		flag.PrintDefaults()
+		fmt.Fprintln(os.Stderr, `
+Parses the given ABI data and tries to interpret it from the fourbyte database.`)
+	}
+}
+
+func parse(data []byte) {
+	db, err := fourbyte.New()
+	if err != nil {
+		die(err)
+	}
+	messages := core.ValidationMessages{}
+	db.ValidateCallData(nil, data, &messages)
+	for _, m := range messages.Messages {
+		fmt.Printf("%v: %v\n", m.Typ, m.Message)
+	}
+}
+
+// Example
+// ./abidump a9059cbb000000000000000000000000ea0e2dc7d65a50e77fc7e84bff3fd2a9e781ff5c0000000000000000000000000000000000000000000000015af1d78b58c40000
+func main() {
+	flag.Parse()
+
+	switch {
+	case flag.NArg() == 1:
+		hexdata := flag.Arg(0)
+		data, err := hex.DecodeString(strings.TrimPrefix(hexdata, "0x"))
+		if err != nil {
+			die(err)
+		}
+		parse(data)
+	default:
+		fmt.Fprintln(os.Stderr, "Error: one argument needed")
+		flag.Usage()
+		os.Exit(2)
+	}
+}
+
+func die(args ...interface{}) {
+	fmt.Fprintln(os.Stderr, args...)
+	os.Exit(1)
+}
--- a/cmd/abigen/main.go
+++ b/cmd/abigen/main.go
@@ -21,30 +21,20 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
+	"path/filepath"
 	"regexp"
 	"strings"

+	"github.com/ethereum/go-ethereum/accounts/abi"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/common/compiler"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/internal/flags"
 	"github.com/ethereum/go-ethereum/log"
 	"gopkg.in/urfave/cli.v1"
 )

-const (
-	commandHelperTemplate = `{{.Name}}{{if .Subcommands}} command{{end}}{{if .Flags}} [command options]{{end}} [arguments...]
-{{if .Description}}{{.Description}}
-{{end}}{{if .Subcommands}}
-SUBCOMMANDS:
-	{{range .Subcommands}}{{.Name}}{{with .ShortName}}, {{.}}{{end}}{{ "\t" }}{{.Usage}}
-	{{end}}{{end}}{{if .Flags}}
-OPTIONS:
-{{range $.Flags}}{{"\t"}}{{.}}
-{{end}}
-{{end}}`
-)
-
 var (
 	// Git SHA1 commit hash of the release (set via linker flags)
 	gitCommit = ""
@@ -111,7 +101,7 @@ var (
 )

 func init() {
-	app = utils.NewApp(gitCommit, gitDate, "ethereum checkpoint helper tool")
+	app = flags.NewApp(gitCommit, gitDate, "ethereum checkpoint helper tool")
 	app.Flags = []cli.Flag{
 		abiFlag,
 		binFlag,
@@ -128,7 +118,7 @@ func init() {
 		aliasFlag,
 	}
 	app.Action = utils.MigrateFlags(abigen)
-	cli.CommandHelpTemplate = commandHelperTemplate
+	cli.CommandHelpTemplate = flags.OriginCommandHelpTemplate
 }

 func abigen(c *cli.Context) error {
@@ -206,10 +196,22 @@ func abigen(c *cli.Context) error {
 				utils.Fatalf("Failed to build Solidity contract: %v", err)
 			}
 		case c.GlobalIsSet(vyFlag.Name):
-			contracts, err = compiler.CompileVyper(c.GlobalString(vyperFlag.Name), c.GlobalString(vyFlag.Name))
+			output, err := compiler.CompileVyper(c.GlobalString(vyperFlag.Name), c.GlobalString(vyFlag.Name))
 			if err != nil {
 				utils.Fatalf("Failed to build Vyper contract: %v", err)
 			}
+			contracts = make(map[string]*compiler.Contract)
+			for n, contract := range output {
+				name := n
+				// Sanitize the combined json names to match the
+				// format expected by solidity.
+				if !strings.Contains(n, ":") {
+					// Remove extra path components
+					name = abi.ToCamelCase(strings.TrimSuffix(filepath.Base(name), ".vy"))
+				}
+				contracts[name] = contract
+			}
+
 		case c.GlobalIsSet(jsonFlag.Name):
 			jsonOutput, err := ioutil.ReadFile(c.GlobalString(jsonFlag.Name))
 			if err != nil {
--- a/cmd/checkpoint-admin/README.md
+++ b/cmd/checkpoint-admin/README.md
@@ -0,0 +1,103 @@
+## Checkpoint-admin
+
+Checkpoint-admin is a tool for updating checkpoint oracle status. It provides a series of functions including deploying checkpoint oracle contract, signing for new checkpoints, and updating checkpoints in the checkpoint oracle contract.
+
+### Checkpoint
+
+In the LES protocol, there is an important concept called checkpoint. In simple terms, whenever a certain number of blocks are generated on the blockchain, a new checkpoint is generated which contains some important information such as
+
+* Block hash at checkpoint
+* Canonical hash trie root at checkpoint
+* Bloom trie root at checkpoint
+
+*For a more detailed introduction to checkpoint, please see the LES [spec](https://github.com/ethereum/devp2p/blob/master/caps/les.md).*
+
+Using this information, light clients can skip all historical block headers when synchronizing data and start synchronization from this checkpoint. Therefore, as long as the light client can obtain some latest and correct checkpoints, the amount of data and time for synchronization will be greatly reduced.
+
+However, from a security perspective, the most critical step in a synchronization algorithm based on checkpoints is to determine whether the checkpoint used by the light client is correct. Otherwise, all blockchain data synchronized based on this checkpoint may be wrong. For this we provide two different ways to ensure the correctness of the checkpoint used by the light client.
+
+#### Hardcoded checkpoint
+
+There are several hardcoded checkpoints in the [source code](https://github.com/ethereum/go-ethereum/blob/master/params/config.go#L38) of the go-ethereum project. These checkpoints are updated by go-ethereum developers when new versions of software are released. Because light client users trust Geth developers to some extent, hardcoded checkpoints in the code can also be considered correct.
+
+#### Checkpoint oracle
+
+Hardcoded checkpoints can solve the problem of verifying the correctness of checkpoints (although this is a more centralized solution). But the pain point of this solution is that developers can only update checkpoints when a new version of software is released. In addition, light client users usually do not keep the Geth version they use always up to date. So hardcoded checkpoints used by users are generally stale. Therefore, it still needs to download a large amount of blockchain data during synchronization.
+
+Checkpoint oracle is a more flexible solution. In simple terms, this is a smart contract that is deployed on the blockchain. The smart contract records several designated trusted signers. Whenever enough trusted signers have issued their signatures for the same checkpoint, it can be considered that the checkpoint has been authenticated by the signers. Checkpoints authenticated by trusted signers can be considered correct.
+
+So this way, even without updating the software version, as long as the trusted signers regularly update the checkpoint in oracle on time, the light client can always use the latest and verified checkpoint for data synchronization.
+
+### Usage
+
+Checkpoint-admin is a command line tool designed for checkpoint oracle. Users can easily deploy contracts and update checkpoints through this tool.
+
+#### Install
+
+```shell
+go get github.com/ethereum/go-ethereum/cmd/checkpoint-admin
+```
+
+#### Deploy
+
+Deploy checkpoint oracle contract. `--signers` indicates the specified trusted signer, and `--threshold` indicates the minimum number of signatures required by trusted signers to update a checkpoint.
+
+```shell
+checkpoint-admin deploy --rpc <NODE_RPC_ENDPOINT> --clef <CLEF_ENDPOINT> --signer <SIGNER_TO_SIGN_TX> --signers <TRUSTED_SIGNER_LIST> --threshold 1
+```
+
+It is worth noting that checkpoint-admin only supports clef as a signer for transactions and plain text(checkpoint). For more clef usage, please see the clef [tutorial](https://geth.ethereum.org/docs/clef/tutorial) .
+
+#### Sign
+
+Checkpoint-admin provides two different modes of signing. You can automatically obtain the current stable checkpoint and sign it interactively, and you can also use the information provided by the command line flags to sign checkpoint offline.
+
+**Interactive mode**
+
+```shell
+checkpoint-admin sign --clef <CLEF_ENDPOINT> --signer <SIGNER_TO_SIGN_CHECKPOINT> --rpc <NODE_RPC_ENDPOINT>
+```
+
+*It is worth noting that the connected Geth node can be a fullnode or a light client. If it is fullnode, you must enable the LES protocol. E.G. add `--light.serv 50` to the startup command line flags*.
+
+**Offline mode**
+
+```shell
+checkpoint-admin sign --clef <CLEF_ENDPOINT> --signer <SIGNER_TO_SIGN_CHECKPOINT> --index <CHECKPOINT_INDEX> --hash <CHECKPOINT_HASH> --oracle <CHECKPOINT_ORACLE_ADDRESS>
+```
+
+*CHECKPOINT_HASH is obtained based on this [calculation method](https://github.com/ethereum/go-ethereum/blob/master/params/config.go#L251).*
+
+#### Publish
+
+Collect enough signatures from different trusted signers for the same checkpoint and submit them to oracle to update the "authenticated" checkpoint in the contract.
+
+```shell
+checkpoint-admin publish --clef <CLEF_ENDPOINT> --rpc <NODE_RPC_ENDPOINT> --signer <SIGNER_TO_SIGN_TX> --index <CHECKPOINT_INDEX> --signatures <CHECKPOINT_SIGNATURE_LIST>
+```
+
+#### Status query
+
+Check the latest status of checkpoint oracle.
+
+```shell
+checkpoint-admin status --rpc <NODE_RPC_ENDPOINT>
+```
+
+### Enable checkpoint oracle in your private network
+
+Currently, only the Ethereum mainnet and the default supported test networks (ropsten, rinkeby, goerli) activate this feature. If you want to activate this feature in your private network, you can overwrite the relevant checkpoint oracle settings through the configuration file after deploying the oracle contract.
+
+* Get your node configuration file `geth dumpconfig OTHER_COMMAND_LINE_OPTIONS > config.toml`
+* Edit the configuration file and add the following information
+
+```toml
+[Eth.CheckpointOracle]
+Address = CHECKPOINT_ORACLE_ADDRESS
+Signers = [TRUSTED_SIGNER_1, ..., TRUSTED_SIGNER_N]
+Threshold = THRESHOLD
+```
+
+* Start geth with the modified configuration file
+
+*In the private network, all fullnodes and light clients need to be started using the same checkpoint oracle settings.*
--- a/cmd/checkpoint-admin/main.go
+++ b/cmd/checkpoint-admin/main.go
@@ -22,25 +22,12 @@ import (
 	"fmt"
 	"os"

-	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/common/fdlimit"
+	"github.com/ethereum/go-ethereum/internal/flags"
 	"github.com/ethereum/go-ethereum/log"
 	"gopkg.in/urfave/cli.v1"
 )

-const (
-	commandHelperTemplate = `{{.Name}}{{if .Subcommands}} command{{end}}{{if .Flags}} [command options]{{end}} [arguments...]
-{{if .Description}}{{.Description}}
-{{end}}{{if .Subcommands}}
-SUBCOMMANDS:
-	{{range .Subcommands}}{{.Name}}{{with .ShortName}}, {{.}}{{end}}{{ "\t" }}{{.Usage}}
-	{{end}}{{end}}{{if .Flags}}
-OPTIONS:
-{{range $.Flags}}{{"\t"}}{{.}}
-{{end}}
-{{end}}`
-)
-
 var (
 	// Git SHA1 commit hash of the release (set via linker flags)
 	gitCommit = ""
@@ -50,7 +37,7 @@ var (
 var app *cli.App

 func init() {
-	app = utils.NewApp(gitCommit, gitDate, "ethereum checkpoint helper tool")
+	app = flags.NewApp(gitCommit, gitDate, "ethereum checkpoint helper tool")
 	app.Commands = []cli.Command{
 		commandStatus,
 		commandDeploy,
@@ -61,7 +48,7 @@ func init() {
 		oracleFlag,
 		nodeURLFlag,
 	}
-	cli.CommandHelpTemplate = commandHelperTemplate
+	cli.CommandHelpTemplate = flags.OriginCommandHelpTemplate
 }

 // Commonly used command line flags.
--- a/cmd/clef/README.md
+++ b/cmd/clef/README.md
@@ -9,7 +9,7 @@ Clef can run as a daemon on the same machine, off a usb-stick like [USB armory](
 Check out the

 * [CLI tutorial](tutorial.md) for some concrete examples on how Clef works.
-* [Setup docs](docs/setup.md) for infos on how to configure Clef on QubesOS or USB Armory.
+* [Setup docs](docs/setup.md) for information on how to configure Clef on QubesOS or USB Armory.
 * [Data types](datatypes.md) for details on the communication messages between Clef and an external UI.

 ## Command line flags
@@ -33,12 +33,12 @@ GLOBAL OPTIONS:
   --lightkdf              Reduce key-derivation RAM & CPU usage at some expense of KDF strength
   --nousb                 Disables monitoring for and managing USB hardware wallets
   --pcscdpath value       Path to the smartcard daemon (pcscd) socket file (default: "/run/pcscd/pcscd.comm")
-   --rpcaddr value         HTTP-RPC server listening interface (default: "localhost")
-   --rpcvhosts value       Comma separated list of virtual hostnames from which to accept requests (server enforced). Accepts '*' wildcard. (default: "localhost")
+   --http.addr value       HTTP-RPC server listening interface (default: "localhost")
+   --http.vhosts value     Comma separated list of virtual hostnames from which to accept requests (server enforced). Accepts '*' wildcard. (default: "localhost")
   --ipcdisable            Disable the IPC-RPC server
   --ipcpath               Filename for IPC socket/pipe within the datadir (explicit paths escape it)
-   --rpc                   Enable the HTTP-RPC server
-   --rpcport value         HTTP-RPC server listening port (default: 8550)
+   --http                  Enable the HTTP-RPC server
+   --http.port value       HTTP-RPC server listening port (default: 8550)
   --signersecret value    A file containing the (encrypted) master seed to encrypt Clef data, e.g. keystore credentials and ruleset hash
   --4bytedb-custom value  File used for writing new 4byte-identifiers submitted via API (default: "./4byte-custom.json")
   --auditlog value        File used to emit audit logs. Set to "" to disable (default: "audit.log")
@@ -46,6 +46,7 @@ GLOBAL OPTIONS:
   --stdio-ui              Use STDIN/STDOUT as a channel for an external UI. This means that an STDIN/STDOUT is used for RPC-communication with a e.g. a graphical user interface, and can be used when Clef is started by an external process.
   --stdio-ui-test         Mechanism to test interface between Clef and UI. Requires 'stdio-ui'.
   --advanced              If enabled, issues warnings instead of rejections for suspicious requests. Default off
+   --suppress-bootwarn     If set, does not show the warning during boot
   --help, -h              show help
   --version, -v           print the version
 ```
@@ -112,11 +113,11 @@ Some snags and todos

 ### External API

-Clef listens to HTTP requests on `rpcaddr`:`rpcport` (or to IPC on `ipcpath`), with the same JSON-RPC standard as Geth. The messages are expected to be [JSON-RPC 2.0 standard](https://www.jsonrpc.org/specification).
+Clef listens to HTTP requests on `http.addr`:`http.port` (or to IPC on `ipcpath`), with the same JSON-RPC standard as Geth. The messages are expected to be [JSON-RPC 2.0 standard](https://www.jsonrpc.org/specification).

-Some of these call can require user interaction. Clients must be aware that responses may be delayed significantly or may never be received if a users decides to ignore the confirmation request.
+Some of these calls can require user interaction. Clients must be aware that responses may be delayed significantly or may never be received if a user decides to ignore the confirmation request.

-The External API is **untrusted**: it does not accept credentials over this API, nor does it expect that requests have any authority.
+The External API is **untrusted**: it does not accept credentials, nor does it expect that requests have any authority.

 ### Internal UI API

@@ -145,13 +146,11 @@ See the [external API changelog](extapi_changelog.md) for information about chan

 All hex encoded values must be prefixed with `0x`.

-## Methods
-
 ### account_new

 #### Create new password protected account

-The signer will generate a new private key, encrypts it according to [web3 keystore spec](https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition) and stores it in the keystore directory.
+The signer will generate a new private key, encrypt it according to [web3 keystore spec](https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition) and store it in the keystore directory.  
 The client is responsible for creating a backup of the keystore. If the keystore is lost there is no method of retrieving lost accounts.

 #### Arguments
@@ -160,7 +159,6 @@ None

 #### Result
  - address [string]: account address that is derived from the generated key
-  - url [string]: location of the keyfile

 #### Sample call
 ```json
@@ -172,14 +170,11 @@ None
 }
 ```
 Response
-```
+```json
 {
  "id": 0,
  "jsonrpc": "2.0",
-  "result": {
-    "address": "0xbea9183f8f4f03d427f6bcea17388bdff1cab133",
-    "url": "keystore:///my/keystore/UTC--2017-08-24T08-40-15.419655028Z--bea9183f8f4f03d427f6bcea17388bdff1cab133"
-  }
+  "result": "0xbea9183f8f4f03d427f6bcea17388bdff1cab133"
 }
 ```

@@ -195,8 +190,6 @@ None
 #### Result
  - array with account records:
     - account.address [string]: account address that is derived from the generated key
-     - account.type [string]: type of the
-     - account.url [string]: location of the account

 #### Sample call
 ```json
@@ -207,21 +200,13 @@ None
 }
 ```
 Response
-```
+```json
 {
  "id": 1,
  "jsonrpc": "2.0",
  "result": [
-    {
-      "address": "0xafb2f771f58513609765698f65d3f2f0224a956f",
-      "type": "account",
-      "url": "keystore:///tmp/keystore/UTC--2017-08-24T07-26-47.162109726Z--afb2f771f58513609765698f65d3f2f0224a956f"
-    },
-    {
-      "address": "0xbea9183f8f4f03d427f6bcea17388bdff1cab133",
-      "type": "account",
-      "url": "keystore:///tmp/keystore/UTC--2017-08-24T08-40-15.419655028Z--bea9183f8f4f03d427f6bcea17388bdff1cab133"
-    }
+    "0xafb2f771f58513609765698f65d3f2f0224a956f",
+    "0xbea9183f8f4f03d427f6bcea17388bdff1cab133"
  ]
 }
 ```
@@ -229,10 +214,10 @@ Response
 ### account_signTransaction

 #### Sign transactions
-   Signs a transactions and responds with the signed transaction in RLP encoded form.
+   Signs a transaction and responds with the signed transaction in RLP-encoded and JSON forms.

 #### Arguments
-  2. transaction object:
+  1. transaction object:
     - `from` [address]: account to send the transaction from
     - `to` [address]: receiver account. If omitted or `0x`, will cause contract creation.
     - `gas` [number]: maximum amount of gas to burn
@@ -240,12 +225,13 @@ Response
     - `value` [number:optional]: amount of Wei to send with the transaction
     - `data` [data:optional]:  input data
     - `nonce` [number]: account nonce
-  3. method signature [string:optional]
+  1. method signature [string:optional]
     - The method signature, if present, is to aid decoding the calldata. Should consist of `methodname(paramtype,...)`, e.g. `transfer(uint256,address)`. The signer may use this data to parse the supplied calldata, and show the user. The data, however, is considered totally untrusted, and reliability is not expected.


 #### Result
-  - signed transaction in RLP encoded form [data]
+  - raw [data]: signed transaction in RLP encoded form
+  - tx [json]: signed transaction in JSON form

 #### Sample call
 ```json
@@ -270,11 +256,22 @@ Response

 ```json
 {
-  "id": 2,
  "jsonrpc": "2.0",
-  "error": {
-    "code": -32000,
-    "message": "Request denied"
+  "id": 2,
+  "result": {
+    "raw": "0xf88380018203339407a565b7ed7d7a678680a4c162885bedbb695fe080a44401a6e4000000000000000000000000000000000000000000000000000000000000001226a0223a7c9bcf5531c99be5ea7082183816eb20cfe0bbc322e97cc5c7f71ab8b20ea02aadee6b34b45bb15bc42d9c09de4a6754e7000908da72d48cc7704971491663",
+    "tx": {
+      "nonce": "0x0",
+      "gasPrice": "0x1234",
+      "gas": "0x55555",
+      "to": "0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
+      "value": "0x1234",
+      "input": "0xabcd",
+      "v": "0x26",
+      "r": "0x223a7c9bcf5531c99be5ea7082183816eb20cfe0bbc322e97cc5c7f71ab8b20e",
+      "s": "0x2aadee6b34b45bb15bc42d9c09de4a6754e7000908da72d48cc7704971491663",
+      "hash": "0xeba2df809e7a612a0a0d444ccfa5c839624bdc00dd29e3340d46df3870f8a30e"
+    }
  }
 }
 ```
@@ -326,7 +323,7 @@ Response

 Bash example:
 ```bash
-#curl -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_signTransaction","params":[{"from":"0x694267f14675d7e1b9494fd8d72fefe1755710fa","gas":"0x333","gasPrice":"0x1","nonce":"0x0","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0", "value":"0x0", "data":"0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"},"safeSend(address)"],"id":67}' http://localhost:8550/
+> curl -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_signTransaction","params":[{"from":"0x694267f14675d7e1b9494fd8d72fefe1755710fa","gas":"0x333","gasPrice":"0x1","nonce":"0x0","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0", "value":"0x0", "data":"0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"},"safeSend(address)"],"id":67}' http://localhost:8550/

 {"jsonrpc":"2.0","id":67,"result":{"raw":"0xf88380018203339407a565b7ed7d7a678680a4c162885bedbb695fe080a44401a6e4000000000000000000000000000000000000000000000000000000000000001226a0223a7c9bcf5531c99be5ea7082183816eb20cfe0bbc322e97cc5c7f71ab8b20ea02aadee6b34b45bb15bc42d9c09de4a6754e7000908da72d48cc7704971491663","tx":{"nonce":"0x0","gasPrice":"0x1","gas":"0x333","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0","value":"0x0","input":"0x4401a6e40000000000000000000000000000000000000000000000000000000000000012","v":"0x26","r":"0x223a7c9bcf5531c99be5ea7082183816eb20cfe0bbc322e97cc5c7f71ab8b20e","s":"0x2aadee6b34b45bb15bc42d9c09de4a6754e7000908da72d48cc7704971491663","hash":"0xeba2df809e7a612a0a0d444ccfa5c839624bdc00dd29e3340d46df3870f8a30e"}}}
 ```
@@ -373,7 +370,7 @@ Response
 ### account_signTypedData

 #### Sign data
-   Signs a chunk of structured data conformant to [EIP712]([EIP-712](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-712.md)) and returns the calculated signature.
+   Signs a chunk of structured data conformant to [EIP-712](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-712.md) and returns the calculated signature.

 #### Arguments
  - account [address]: account to sign with
@@ -469,7 +466,7 @@ Response

 ### account_ecRecover

-#### Sign data
+#### Recover the signing address

 Derive the address from the account that was used to sign data with content type `text/plain` and the signature.

@@ -487,7 +484,6 @@ Derive the address from the account that was used to sign data with content type
  "jsonrpc": "2.0",
  "method": "account_ecRecover",
  "params": [
-    "data/plain",
    "0xaabbccdd",
    "0x5b6693f153b48ec1c706ba4169960386dbaa6903e249cc79a8e6ddc434451d417e1e57327872c7f538beeb323c300afa9999a3d4a5de6caf3be0d5ef832b67ef1c"
  ]
@@ -503,117 +499,36 @@ Response
 }
 ```

-### account_import
+### account_version

-#### Import account
-   Import a private key into the keystore. The imported key is expected to be encrypted according to the web3 keystore
-   format.
+#### Get external API version
+
+Get the version of the external API used by Clef.

 #### Arguments
-  - account [object]: key in [web3 keystore format](https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition) (retrieved with account_export)
+
+None

 #### Result
-  - imported key [object]:
-     - key.address [address]: address of the imported key
-     - key.type [string]: type of the account
-     - key.url [string]: key URL
+
+* external API version [string]

 #### Sample call
 ```json
 {
-  "id": 6,
+  "id": 0,
  "jsonrpc": "2.0",
-  "method": "account_import",
-  "params": [
-    {
-      "address": "c7412fc59930fd90099c917a50e5f11d0934b2f5",
-      "crypto": {
-        "cipher": "aes-128-ctr",
-        "cipherparams": {
-          "iv": "401c39a7c7af0388491c3d3ecb39f532"
-        },
-        "ciphertext": "eb045260b18dd35cd0e6d99ead52f8fa1e63a6b0af2d52a8de198e59ad783204",
-        "kdf": "scrypt",
-        "kdfparams": {
-          "dklen": 32,
-          "n": 262144,
-          "p": 1,
-          "r": 8,
-          "salt": "9a657e3618527c9b5580ded60c12092e5038922667b7b76b906496f021bb841a"
-        },
-        "mac": "880dc10bc06e9cec78eb9830aeb1e7a4a26b4c2c19615c94acb632992b952806"
-      },
-      "id": "09bccb61-b8d3-4e93-bf4f-205a8194f0b9",
-      "version": 3
-    }
-  ]
+  "method": "account_version",
+  "params": []
 }
 ```
+
 Response
-
 ```json
 {
-  "id": 6,
-  "jsonrpc": "2.0",
-  "result": {
-    "address": "0xc7412fc59930fd90099c917a50e5f11d0934b2f5",
-    "type": "account",
-    "url": "keystore:///tmp/keystore/UTC--2017-08-24T11-00-42.032024108Z--c7412fc59930fd90099c917a50e5f11d0934b2f5"
-  }
-}
-```
-
-### account_export
-
-#### Export account from keystore
-   Export a private key from the keystore. The exported private key is encrypted with the original password. When the
-   key is imported later this password is required.
-
-#### Arguments
-  - account [address]: export private key that is associated with this account
-
-#### Result
-  - exported key, see [web3 keystore format](https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition) for
-  more information
-
-#### Sample call
-```json
-{
-  "id": 5,
-  "jsonrpc": "2.0",
-  "method": "account_export",
-  "params": [
-    "0xc7412fc59930fd90099c917a50e5f11d0934b2f5"
-  ]
-}
-```
-Response
-
-```json
-{
-  "id": 5,
-  "jsonrpc": "2.0",
-  "result": {
-    "address": "c7412fc59930fd90099c917a50e5f11d0934b2f5",
-    "crypto": {
-      "cipher": "aes-128-ctr",
-      "cipherparams": {
-        "iv": "401c39a7c7af0388491c3d3ecb39f532"
-      },
-      "ciphertext": "eb045260b18dd35cd0e6d99ead52f8fa1e63a6b0af2d52a8de198e59ad783204",
-      "kdf": "scrypt",
-      "kdfparams": {
-        "dklen": 32,
-        "n": 262144,
-        "p": 1,
-        "r": 8,
-        "salt": "9a657e3618527c9b5580ded60c12092e5038922667b7b76b906496f021bb841a"
-      },
-      "mac": "880dc10bc06e9cec78eb9830aeb1e7a4a26b4c2c19615c94acb632992b952806"
-    },
-    "id": "09bccb61-b8d3-4e93-bf4f-205a8194f0b9",
-    "version": 3
-  }
+    "id": 0,
+    "jsonrpc": "2.0",
+    "result": "6.0.0"
 }
 ```

@@ -625,7 +540,7 @@ By starting the signer with the switch `--stdio-ui-test`, the signer will invoke
 denials. This can be used during development to ensure that the API is (at least somewhat) correctly implemented.
 See `pythonsigner`, which can be invoked via `python3 pythonsigner.py test` to perform the 'denial-handshake-test'.

-All methods in this API uses object-based parameters, so that there can be no mixups of parameters: each piece of data is accessed by key.
+All methods in this API use object-based parameters, so that there can be no mixup of parameters: each piece of data is accessed by key.

 See the [ui API changelog](intapi_changelog.md) for information about changes to this API.

@@ -784,12 +699,10 @@ Invoked when a request for account listing has been made.
    {
      "accounts": [
        {
-          "type": "Account",
          "url": "keystore:///home/bazonk/.ethereum/keystore/UTC--2017-11-20T14-44-54.089682944Z--123409812340981234098123409812deadbeef42",
          "address": "0x123409812340981234098123409812deadbeef42"
        },
        {
-          "type": "Account",
          "url": "keystore:///home/bazonk/.ethereum/keystore/UTC--2017-11-23T21-59-03.199240693Z--cafebabedeadbeef34098123409812deadbeef42",
          "address": "0xcafebabedeadbeef34098123409812deadbeef42"
        }
@@ -819,7 +732,13 @@ Invoked when a request for account listing has been made.
    {
      "address": "0x123409812340981234098123409812deadbeef42",
      "raw_data": "0x01020304",
-      "message": "\u0019Ethereum Signed Message:\n4\u0001\u0002\u0003\u0004",
+      "messages": [
+        {
+          "name": "message",
+          "value": "\u0019Ethereum Signed Message:\n4\u0001\u0002\u0003\u0004",
+          "type": "text/plain"
+        }
+      ],
      "hash": "0x7e3a4e7a9d1744bc5c675c25e1234ca8ed9162bd17f78b9085e48047c15ac310",
      "meta": {
        "remote": "signer binary",
@@ -829,12 +748,34 @@ Invoked when a request for account listing has been made.
    }
  ]
 }
+```

+### ApproveNewAccount / `ui_approveNewAccount`
+
+Invoked when a request for creating a new account has been made.
+
+#### Sample call
+
+```json
+{
+  "jsonrpc": "2.0",
+  "id": 4,
+  "method": "ui_approveNewAccount",
+  "params": [
+    {
+      "meta": {
+        "remote": "signer binary",
+        "local": "main",
+        "scheme": "in-proc"
+      }
+    }
+  ]
+}
 ```

 ### ShowInfo / `ui_showInfo`

-The UI should show the info to the user. Does not expect response.
+The UI should show the info (a single message) to the user. Does not expect response.

 #### Sample call

@@ -844,9 +785,7 @@ The UI should show the info to the user. Does not expect response.
  "id": 9,
  "method": "ui_showInfo",
  "params": [
-    {
-      "text": "Tests completed"
-    }
+    "Tests completed"
  ]
 }

@@ -854,18 +793,16 @@ The UI should show the info to the user. Does not expect response.

 ### ShowError / `ui_showError`

-The UI should show the info to the user. Does not expect response.
+The UI should show the error (a single message) to the user. Does not expect response.

 ```json

 {
  "jsonrpc": "2.0",
  "id": 2,
-  "method": "ShowError",
+  "method": "ui_showError",
  "params": [
-    {
-      "text": "Testing 'ShowError'"
-    }
+    "Something bad happened!"
  ]
 }

@@ -879,9 +816,36 @@ When implementing rate-limited rules, this callback should be used.

 TLDR; Use this method to keep track of signed transactions, instead of using the data in `ApproveTx`.

+Example call:
+```json
+
+{
+  "jsonrpc": "2.0",
+  "id": 1,
+  "method": "ui_onApprovedTx",
+  "params": [
+    {
+      "raw": "0xf88380018203339407a565b7ed7d7a678680a4c162885bedbb695fe080a44401a6e4000000000000000000000000000000000000000000000000000000000000001226a0223a7c9bcf5531c99be5ea7082183816eb20cfe0bbc322e97cc5c7f71ab8b20ea02aadee6b34b45bb15bc42d9c09de4a6754e7000908da72d48cc7704971491663",
+      "tx": {
+        "nonce": "0x0",
+        "gasPrice": "0x1",
+        "gas": "0x333",
+        "to": "0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
+        "value": "0x0",
+        "input": "0x4401a6e40000000000000000000000000000000000000000000000000000000000000012",
+        "v": "0x26",
+        "r": "0x223a7c9bcf5531c99be5ea7082183816eb20cfe0bbc322e97cc5c7f71ab8b20e",
+        "s": "0x2aadee6b34b45bb15bc42d9c09de4a6754e7000908da72d48cc7704971491663",
+        "hash": "0xeba2df809e7a612a0a0d444ccfa5c839624bdc00dd29e3340d46df3870f8a30e"
+      }
+    }
+  ]
+}
+```
+
 ### OnSignerStartup / `ui_onSignerStartup`

-This method provide the UI with information about what API version the signer uses (both internal and external) aswell as build-info and external API,
+This method provides the UI with information about what API version the signer uses (both internal and external) as well as build-info and external API,
 in k/v-form.

 Example call:
@@ -905,6 +869,27 @@ Example call:

 ```

+### OnInputRequired / `ui_onInputRequired`
+
+Invoked when Clef requires user input (e.g. a password).
+
+Example call:
+```json
+
+{
+  "jsonrpc": "2.0",
+  "id": 1,
+  "method": "ui_onInputRequired",
+  "params": [
+    {
+      "title": "Account password",
+      "prompt": "Please enter the password for account 0x694267f14675d7e1b9494fd8d72fefe1755710fa",
+      "isPassword": true
+    }
+  ]
+}
+```
+

 ### Rules for UI apis

--- a/cmd/clef/datatypes.md
+++ b/cmd/clef/datatypes.md
@@ -3,7 +3,7 @@
 These data types are defined in the channel between clef and the UI
 ### SignDataRequest

-SignDataRequest contains information about a pending request to sign some data. The data to be signed can be of various types, defined by content-type. Clef has done most of the work in canonicalizing and making sense of the data, and it's up to the UI to presentthe user with the contents of the `message`
+SignDataRequest contains information about a pending request to sign some data. The data to be signed can be of various types, defined by content-type. Clef has done most of the work in canonicalizing and making sense of the data, and it's up to the UI to present the user with the contents of the `message`

 Example:
 ```json
--- a/cmd/clef/docs/setup.md
+++ b/cmd/clef/docs/setup.md
@@ -34,7 +34,7 @@ There are two ways that this can be achieved: integrated via Qubes or integrated

 #### 1. Qubes Integrated

-Qubes provdes a facility for inter-qubes communication via `qrexec`. A qube can request to make a cross-qube RPC request 
+Qubes provides a facility for inter-qubes communication via `qrexec`. A qube can request to make a cross-qube RPC request 
 to another qube. The OS then asks the user if the call is permitted. 

 ![Example](qubes/qrexec-example.png)
@@ -48,7 +48,7 @@ This is how [Split GPG](https://www.qubes-os.org/doc/split-gpg/) is implemented.

 ![Clef via qrexec](qubes/clef_qubes_qrexec.png)

-On the `target` qubes, we need to define the rpc service.
+On the `target` qubes, we need to define the RPC service.

 [qubes.Clefsign](qubes/qubes.Clefsign):

@@ -135,11 +135,11 @@ $ cat newaccnt.json
 $ cat newaccnt.json| qrexec-client-vm debian-work qubes.Clefsign
 ```

-This should pop up first a dialog to allow the IPC call:
+A dialog should pop up first to allow the IPC call:

 ![one](qubes/qubes_newaccount-1.png)

-Followed by a GTK-dialog to approve the operation
+Followed by a GTK-dialog to approve the operation:

 ![two](qubes/qubes_newaccount-2.png)

@@ -169,7 +169,7 @@ However, it comes with a couple of drawbacks:
  - The `Origin` header must be forwarded
  - Information about the remote ip must be added as a `X-Forwarded-For`. However, Clef cannot always trust an `XFF` header, 
  since malicious clients may lie about `XFF` in order to fool the http server into believing it comes from another address.
- Even with a policy in place to allow rpc-calls between `caller` and `target`, there will be several popups:
+- Even with a policy in place to allow RPC calls between `caller` and `target`, there will be several popups:
  - One qubes-specific where the user specifies the `target` vm
  - One clef-specific to approve the transaction
  
@@ -177,7 +177,7 @@ However, it comes with a couple of drawbacks:
 #### 2. Network integrated

 The second way to set up Clef on a qubes system is to allow networking, and have Clef listen to a port which is accessible
-form other qubes. 
+from other qubes. 

 ![Clef via http](qubes/clef_qubes_http.png)

@@ -186,13 +186,13 @@ form other qubes.

 ## USBArmory

-The [USB armory](https://inversepath.com/usbarmory) is an open source hardware design with an 800 Mhz ARM processor. It is a pocket-size
+The [USB armory](https://inversepath.com/usbarmory) is an open source hardware design with an 800 MHz ARM processor. It is a pocket-size
 computer. When inserted into a laptop, it identifies itself as a USB network interface, basically adding another network
 to your computer. Over this new network interface, you can SSH into the device. 

 Running Clef off a USB armory means that you can use the armory as a very versatile offline computer, which only
 ever connects to a local network between your computer and the device itself.

-Needless to say, the while this model should be fairly secure against remote attacks, an attacker with physical access
+Needless to say, while this model should be fairly secure against remote attacks, an attacker with physical access
 to the USB Armory would trivially be able to extract the contents of the device filesystem. 

--- a/cmd/clef/intapi_changelog.md
+++ b/cmd/clef/intapi_changelog.md
@@ -10,6 +10,17 @@ TL;DR: Given a version number MAJOR.MINOR.PATCH, increment the:

 Additional labels for pre-release and build metadata are available as extensions to the MAJOR.MINOR.PATCH format.

+### 7.0.1 
+
+Added `clef_New` to the internal API callable from a UI.
+
+> `New` creates a new password protected Account. The private key is protected with
+> the given password. Users are responsible to backup the private key that is stored
+> in the keystore location that was specified when this API was created.
+> This method is the same as New on the external API, the difference being that
+> this implementation does not ask for confirmation, since it's initiated by
+> the user
+
 ### 7.0.0

 - The `message` field was renamed to `messages` in all data signing request methods to better reflect that it's a list, not a value.
@@ -150,7 +161,7 @@ UserInputResponse struct {
 #### 1.2.0

 * Add `OnStartup` method, to provide the UI with information about what API version
-the signer uses (both internal and external) aswell as build-info and external api.
+the signer uses (both internal and external) as well as build-info and external api.

 Example call:
 ```json
--- a/cmd/clef/main.go
+++ b/cmd/clef/main.go
@@ -32,6 +32,7 @@ import (
 	"os/user"
 	"path/filepath"
 	"runtime"
+	"sort"
 	"strings"
 	"time"

@@ -40,10 +41,10 @@ import (
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
-	"github.com/ethereum/go-ethereum/console"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/internal/ethapi"
+	"github.com/ethereum/go-ethereum/internal/flags"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/node"
 	"github.com/ethereum/go-ethereum/params"
@@ -53,6 +54,7 @@ import (
 	"github.com/ethereum/go-ethereum/signer/fourbyte"
 	"github.com/ethereum/go-ethereum/signer/rules"
 	"github.com/ethereum/go-ethereum/signer/storage"
+
 	colorable "github.com/mattn/go-colorable"
 	"github.com/mattn/go-isatty"
 	"gopkg.in/urfave/cli.v1"
@@ -82,6 +84,10 @@ var (
 		Name:  "advanced",
 		Usage: "If enabled, issues warnings instead of rejections for suspicious requests. Default off",
 	}
+	acceptFlag = cli.BoolFlag{
+		Name:  "suppress-bootwarn",
+		Usage: "If set, does not show the warning during boot",
+	}
 	keystoreFlag = cli.StringFlag{
 		Name:  "keystore",
 		Value: filepath.Join(node.DefaultDataDir(), "keystore"),
@@ -98,10 +104,15 @@ var (
 		Usage: "Chain id to use for signing (1=mainnet, 3=Ropsten, 4=Rinkeby, 5=Goerli)",
 	}
 	rpcPortFlag = cli.IntFlag{
-		Name:  "rpcport",
+		Name:  "http.port",
 		Usage: "HTTP-RPC server listening port",
 		Value: node.DefaultHTTPPort + 5,
 	}
+	legacyRPCPortFlag = cli.IntFlag{
+		Name:  "rpcport",
+		Usage: "HTTP-RPC server listening port (Deprecated, please use --http.port).",
+		Value: node.DefaultHTTPPort + 5,
+	}
 	signerSecretFlag = cli.StringFlag{
 		Name:  "signersecret",
 		Usage: "A file containing the (encrypted) master seed to encrypt Clef data, e.g. keystore credentials and ruleset hash",
@@ -187,6 +198,22 @@ The setpw command stores a password for a given address (keyfile).
 		Description: `
 The delpw command removes a password for a given address (keyfile).
 `}
+	newAccountCommand = cli.Command{
+		Action:    utils.MigrateFlags(newAccount),
+		Name:      "newaccount",
+		Usage:     "Create a new account",
+		ArgsUsage: "",
+		Flags: []cli.Flag{
+			logLevelFlag,
+			keystoreFlag,
+			utils.LightKDFFlag,
+			acceptFlag,
+		},
+		Description: `
+The newaccount command creates a new keystore-backed account. It is a convenience-method
+which can be used in lieu of an external UI.`,
+	}
+
 	gendocCommand = cli.Command{
 		Action: GenDoc,
 		Name:   "gendoc",
@@ -196,6 +223,42 @@ The gendoc generates example structures of the json-rpc communication types.
 `}
 )

+// AppHelpFlagGroups is the application flags, grouped by functionality.
+var AppHelpFlagGroups = []flags.FlagGroup{
+	{
+		Name: "FLAGS",
+		Flags: []cli.Flag{
+			logLevelFlag,
+			keystoreFlag,
+			configdirFlag,
+			chainIdFlag,
+			utils.LightKDFFlag,
+			utils.NoUSBFlag,
+			utils.SmartCardDaemonPathFlag,
+			utils.HTTPListenAddrFlag,
+			utils.HTTPVirtualHostsFlag,
+			utils.IPCDisabledFlag,
+			utils.IPCPathFlag,
+			utils.HTTPEnabledFlag,
+			rpcPortFlag,
+			signerSecretFlag,
+			customDBFlag,
+			auditLogFlag,
+			ruleFlag,
+			stdiouiFlag,
+			testFlag,
+			advancedMode,
+			acceptFlag,
+		},
+	},
+	{
+		Name: "ALIASED (deprecated)",
+		Flags: []cli.Flag{
+			legacyRPCPortFlag,
+		},
+	},
+}
+
 func init() {
 	app.Name = "Clef"
 	app.Usage = "Manage Ethereum account operations"
@@ -207,11 +270,11 @@ func init() {
 		utils.LightKDFFlag,
 		utils.NoUSBFlag,
 		utils.SmartCardDaemonPathFlag,
-		utils.RPCListenAddrFlag,
-		utils.RPCVirtualHostsFlag,
+		utils.HTTPListenAddrFlag,
+		utils.HTTPVirtualHostsFlag,
 		utils.IPCDisabledFlag,
 		utils.IPCPathFlag,
-		utils.RPCEnabledFlag,
+		utils.HTTPEnabledFlag,
 		rpcPortFlag,
 		signerSecretFlag,
 		customDBFlag,
@@ -220,9 +283,51 @@ func init() {
 		stdiouiFlag,
 		testFlag,
 		advancedMode,
+		acceptFlag,
+		legacyRPCPortFlag,
 	}
 	app.Action = signer
-	app.Commands = []cli.Command{initCommand, attestCommand, setCredentialCommand, delCredentialCommand, gendocCommand}
+	app.Commands = []cli.Command{initCommand,
+		attestCommand,
+		setCredentialCommand,
+		delCredentialCommand,
+		newAccountCommand,
+		gendocCommand}
+	cli.CommandHelpTemplate = flags.CommandHelpTemplate
+	// Override the default app help template
+	cli.AppHelpTemplate = flags.ClefAppHelpTemplate
+
+	// Override the default app help printer, but only for the global app help
+	originalHelpPrinter := cli.HelpPrinter
+	cli.HelpPrinter = func(w io.Writer, tmpl string, data interface{}) {
+		if tmpl == flags.ClefAppHelpTemplate {
+			// Render out custom usage screen
+			originalHelpPrinter(w, tmpl, flags.HelpData{App: data, FlagGroups: AppHelpFlagGroups})
+		} else if tmpl == flags.CommandHelpTemplate {
+			// Iterate over all command specific flags and categorize them
+			categorized := make(map[string][]cli.Flag)
+			for _, flag := range data.(cli.Command).Flags {
+				if _, ok := categorized[flag.String()]; !ok {
+					categorized[flags.FlagCategory(flag, AppHelpFlagGroups)] = append(categorized[flags.FlagCategory(flag, AppHelpFlagGroups)], flag)
+				}
+			}
+
+			// sort to get a stable ordering
+			sorted := make([]flags.FlagGroup, 0, len(categorized))
+			for cat, flgs := range categorized {
+				sorted = append(sorted, flags.FlagGroup{Name: cat, Flags: flgs})
+			}
+			sort.Sort(flags.ByCategory(sorted))
+
+			// add sorted array to data and render with default printer
+			originalHelpPrinter(w, tmpl, map[string]interface{}{
+				"cmd":              data,
+				"categorizedFlags": sorted,
+			})
+		} else {
+			originalHelpPrinter(w, tmpl, data)
+		}
+	}
 }

 func main() {
@@ -262,7 +367,7 @@ func initializeSecrets(c *cli.Context) error {
 	text := "The master seed of clef will be locked with a password.\nPlease specify a password. Do not forget this password!"
 	var password string
 	for {
-		password = getPassPhrase(text, true)
+		password = utils.GetPassPhrase(text, true)
 		if err := core.ValidatePasswordFormat(password); err != nil {
 			fmt.Printf("invalid password: %v\n", err)
 		} else {
@@ -335,7 +440,7 @@ func setCredential(ctx *cli.Context) error {
 		utils.Fatalf("Invalid address specified: %s", addr)
 	}
 	address := common.HexToAddress(addr)
-	password := getPassPhrase("Please enter a password to store for this address:", true)
+	password := utils.GetPassPhrase("Please enter a password to store for this address:", true)
 	fmt.Println()

 	stretchedKey, err := readMasterKey(ctx, nil)
@@ -381,14 +486,41 @@ func removeCredential(ctx *cli.Context) error {
 	return nil
 }

+func newAccount(c *cli.Context) error {
+	if err := initialize(c); err != nil {
+		return err
+	}
+	// The newaccount is meant for users using the CLI, since 'real' external
+	// UIs can use the UI-api instead. So we'll just use the native CLI UI here.
+	var (
+		ui                        = core.NewCommandlineUI()
+		pwStorage storage.Storage = &storage.NoStorage{}
+		ksLoc                     = c.GlobalString(keystoreFlag.Name)
+		lightKdf                  = c.GlobalBool(utils.LightKDFFlag.Name)
+	)
+	log.Info("Starting clef", "keystore", ksLoc, "light-kdf", lightKdf)
+	am := core.StartClefAccountManager(ksLoc, true, lightKdf, "")
+	// This gives is us access to the external API
+	apiImpl := core.NewSignerAPI(am, 0, true, ui, nil, false, pwStorage)
+	// This gives us access to the internal API
+	internalApi := core.NewUIServerAPI(apiImpl)
+	addr, err := internalApi.New(context.Background())
+	if err == nil {
+		fmt.Printf("Generated account %v\n", addr.String())
+	}
+	return err
+}
+
 func initialize(c *cli.Context) error {
 	// Set up the logger to print everything
 	logOutput := os.Stdout
 	if c.GlobalBool(stdiouiFlag.Name) {
 		logOutput = os.Stderr
 		// If using the stdioui, we can't do the 'confirm'-flow
-		fmt.Fprint(logOutput, legalWarning)
-	} else {
+		if !c.GlobalBool(acceptFlag.Name) {
+			fmt.Fprint(logOutput, legalWarning)
+		}
+	} else if !c.GlobalBool(acceptFlag.Name) {
 		if !confirm(legalWarning) {
 			return fmt.Errorf("aborted by user")
 		}
@@ -456,7 +588,6 @@ func signer(c *cli.Context) error {
 		api       core.ExternalAPI
 		pwStorage storage.Storage = &storage.NoStorage{}
 	)
-
 	configDir := c.GlobalString(configdirFlag.Name)
 	if stretchedKey, err := readMasterKey(c, ui); err != nil {
 		log.Warn("Failed to open master, rules disabled", "err", err)
@@ -534,22 +665,39 @@ func signer(c *cli.Context) error {
 			Service:   api,
 			Version:   "1.0"},
 	}
-	if c.GlobalBool(utils.RPCEnabledFlag.Name) {
-		vhosts := splitAndTrim(c.GlobalString(utils.RPCVirtualHostsFlag.Name))
-		cors := splitAndTrim(c.GlobalString(utils.RPCCORSDomainFlag.Name))
+	if c.GlobalBool(utils.HTTPEnabledFlag.Name) {
+		vhosts := splitAndTrim(c.GlobalString(utils.HTTPVirtualHostsFlag.Name))
+		cors := splitAndTrim(c.GlobalString(utils.HTTPCORSDomainFlag.Name))
+
+		srv := rpc.NewServer()
+		err := node.RegisterApisFromWhitelist(rpcAPI, []string{"account"}, srv, false)
+		if err != nil {
+			utils.Fatalf("Could not register API: %w", err)
+		}
+		handler := node.NewHTTPHandlerStack(srv, cors, vhosts)
+
+		// set port
+		port := c.Int(rpcPortFlag.Name)
+		if c.GlobalIsSet(legacyRPCPortFlag.Name) {
+			if !c.GlobalIsSet(rpcPortFlag.Name) {
+				port = c.Int(legacyRPCPortFlag.Name)
+			}
+			log.Warn("The flag --rpcport is deprecated and will be removed in the future, please use --http.port")
+		}

 		// start http server
-		httpEndpoint := fmt.Sprintf("%s:%d", c.GlobalString(utils.RPCListenAddrFlag.Name), c.Int(rpcPortFlag.Name))
-		listener, _, err := rpc.StartHTTPEndpoint(httpEndpoint, rpcAPI, []string{"account"}, cors, vhosts, rpc.DefaultHTTPTimeouts)
+		httpEndpoint := fmt.Sprintf("%s:%d", c.GlobalString(utils.HTTPListenAddrFlag.Name), port)
+		httpServer, addr, err := node.StartHTTPEndpoint(httpEndpoint, rpc.DefaultHTTPTimeouts, handler)
 		if err != nil {
 			utils.Fatalf("Could not start RPC api: %v", err)
 		}
-		extapiURL = fmt.Sprintf("http://%s", httpEndpoint)
+		extapiURL = fmt.Sprintf("http://%v/", addr)
 		log.Info("HTTP endpoint opened", "url", extapiURL)

 		defer func() {
-			listener.Close()
-			log.Info("HTTP endpoint closed", "url", httpEndpoint)
+			// Don't bother imposing a timeout here.
+			httpServer.Shutdown(context.Background())
+			log.Info("HTTP endpoint closed", "url", extapiURL)
 		}()
 	}
 	if !c.GlobalBool(utils.IPCDisabledFlag.Name) {
@@ -659,7 +807,7 @@ func readMasterKey(ctx *cli.Context, ui core.UIClientAPI) ([]byte, error) {
 		}
 		password = resp.Text
 	} else {
-		password = getPassPhrase("Decrypt master seed of clef", false)
+		password = utils.GetPassPhrase("Decrypt master seed of clef", false)
 	}
 	masterSeed, err := decryptSeed(cipherKey, password)
 	if err != nil {
@@ -854,27 +1002,6 @@ func testExternalUI(api *core.SignerAPI) {

 }

-// getPassPhrase retrieves the password associated with clef, either fetched
-// from a list of preloaded passphrases, or requested interactively from the user.
-// TODO: there are many `getPassPhrase` functions, it will be better to abstract them into one.
-func getPassPhrase(prompt string, confirmation bool) string {
-	fmt.Println(prompt)
-	password, err := console.Stdin.PromptPassword("Password: ")
-	if err != nil {
-		utils.Fatalf("Failed to read password: %v", err)
-	}
-	if confirmation {
-		confirm, err := console.Stdin.PromptPassword("Repeat password: ")
-		if err != nil {
-			utils.Fatalf("Failed to read password confirmation: %v", err)
-		}
-		if password != confirm {
-			utils.Fatalf("Passwords do not match")
-		}
-	}
-	return password
-}
-
 type encryptedSeedStorage struct {
 	Description string              `json:"description"`
 	Version     int                 `json:"version"`
@@ -925,7 +1052,7 @@ func GenDoc(ctx *cli.Context) {
 			if data, err := json.MarshalIndent(v, "", "  "); err == nil {
 				output = append(output, fmt.Sprintf("### %s\n\n%s\n\nExample:\n```json\n%s\n```", name, desc, data))
 			} else {
-				log.Error("Error generating output", err)
+				log.Error("Error generating output", "err", err)
 			}
 		}
 	)
--- a/cmd/clef/tutorial.md
+++ b/cmd/clef/tutorial.md
@@ -1,6 +1,6 @@
 ## Initializing Clef

-First thing's first, Clef needs to store some data itself. Since that data might be sensitive (passwords, signing rules, accounts), Clef's entire storage is encrypted. To support encrypting data, the first step is to initialize Clef with a random master seed, itself too encrypted with your chosen password:
+First things first, Clef needs to store some data itself. Since that data might be sensitive (passwords, signing rules, accounts), Clef's entire storage is encrypted. To support encrypting data, the first step is to initialize Clef with a random master seed, itself too encrypted with your chosen password:

 ```text
 $ clef init
--- a/cmd/devp2p/crawl.go
+++ b/cmd/devp2p/crawl.go
@@ -20,14 +20,13 @@ import (
 	"time"

 	"github.com/ethereum/go-ethereum/log"
-	"github.com/ethereum/go-ethereum/p2p/discover"
 	"github.com/ethereum/go-ethereum/p2p/enode"
 )

 type crawler struct {
 	input     nodeSet
 	output    nodeSet
-	disc      *discover.UDPv4
+	disc      resolver
 	iters     []enode.Iterator
 	inputIter enode.Iterator
 	ch        chan *enode.Node
@@ -37,7 +36,11 @@ type crawler struct {
 	revalidateInterval time.Duration
 }

-func newCrawler(input nodeSet, disc *discover.UDPv4, iters ...enode.Iterator) *crawler {
+type resolver interface {
+	RequestENR(*enode.Node) (*enode.Node, error)
+}
+
+func newCrawler(input nodeSet, disc resolver, iters ...enode.Iterator) *crawler {
 	c := &crawler{
 		input:     input,
 		output:    make(nodeSet, len(input)),
@@ -63,6 +66,7 @@ func (c *crawler) run(timeout time.Duration) nodeSet {
 		doneCh       = make(chan enode.Iterator, len(c.iters))
 		liveIters    = len(c.iters)
 	)
+	defer timeoutTimer.Stop()
 	for _, it := range c.iters {
 		go c.runIterator(doneCh, it)
 	}
--- a/cmd/devp2p/discv4cmd.go
+++ b/cmd/devp2p/discv4cmd.go
@@ -19,11 +19,14 @@ package main
 import (
 	"fmt"
 	"net"
+	"os"
 	"strings"
 	"time"

+	"github.com/ethereum/go-ethereum/cmd/devp2p/internal/v4test"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/internal/utesting"
 	"github.com/ethereum/go-ethereum/p2p/discover"
 	"github.com/ethereum/go-ethereum/p2p/enode"
 	"github.com/ethereum/go-ethereum/params"
@@ -40,6 +43,7 @@ var (
 			discv4ResolveCommand,
 			discv4ResolveJSONCommand,
 			discv4CrawlCommand,
+			discv4TestCommand,
 		},
 	}
 	discv4PingCommand = cli.Command{
@@ -74,6 +78,12 @@ var (
 		Action: discv4Crawl,
 		Flags:  []cli.Flag{bootnodesFlag, crawlTimeoutFlag},
 	}
+	discv4TestCommand = cli.Command{
+		Name:   "test",
+		Usage:  "Runs tests against a node",
+		Action: discv4Test,
+		Flags:  []cli.Flag{remoteEnodeFlag, testPatternFlag, testListen1Flag, testListen2Flag},
+	}
 )

 var (
@@ -81,11 +91,42 @@ var (
 		Name:  "bootnodes",
 		Usage: "Comma separated nodes used for bootstrapping",
 	}
+	nodekeyFlag = cli.StringFlag{
+		Name:  "nodekey",
+		Usage: "Hex-encoded node key",
+	}
+	nodedbFlag = cli.StringFlag{
+		Name:  "nodedb",
+		Usage: "Nodes database location",
+	}
+	listenAddrFlag = cli.StringFlag{
+		Name:  "addr",
+		Usage: "Listening address",
+	}
 	crawlTimeoutFlag = cli.DurationFlag{
 		Name:  "timeout",
 		Usage: "Time limit for the crawl.",
 		Value: 30 * time.Minute,
 	}
+	remoteEnodeFlag = cli.StringFlag{
+		Name:   "remote",
+		Usage:  "Enode of the remote node under test",
+		EnvVar: "REMOTE_ENODE",
+	}
+	testPatternFlag = cli.StringFlag{
+		Name:  "run",
+		Usage: "Pattern of test suite(s) to run",
+	}
+	testListen1Flag = cli.StringFlag{
+		Name:  "listen1",
+		Usage: "IP address of the first tester",
+		Value: v4test.Listen1,
+	}
+	testListen2Flag = cli.StringFlag{
+		Name:  "listen2",
+		Usage: "IP address of the second tester",
+		Value: v4test.Listen2,
+	}
 )

 func discv4Ping(ctx *cli.Context) error {
@@ -172,6 +213,84 @@ func discv4Crawl(ctx *cli.Context) error {
 	return nil
 }

+func discv4Test(ctx *cli.Context) error {
+	// Configure test package globals.
+	if !ctx.IsSet(remoteEnodeFlag.Name) {
+		return fmt.Errorf("Missing -%v", remoteEnodeFlag.Name)
+	}
+	v4test.Remote = ctx.String(remoteEnodeFlag.Name)
+	v4test.Listen1 = ctx.String(testListen1Flag.Name)
+	v4test.Listen2 = ctx.String(testListen2Flag.Name)
+
+	// Filter and run test cases.
+	tests := v4test.AllTests
+	if ctx.IsSet(testPatternFlag.Name) {
+		tests = utesting.MatchTests(tests, ctx.String(testPatternFlag.Name))
+	}
+	results := utesting.RunTests(tests, os.Stdout)
+	if fails := utesting.CountFailures(results); fails > 0 {
+		return fmt.Errorf("%v/%v tests passed.", len(tests)-fails, len(tests))
+	}
+	fmt.Printf("%v/%v passed\n", len(tests), len(tests))
+	return nil
+}
+
+// startV4 starts an ephemeral discovery V4 node.
+func startV4(ctx *cli.Context) *discover.UDPv4 {
+	ln, config := makeDiscoveryConfig(ctx)
+	socket := listen(ln, ctx.String(listenAddrFlag.Name))
+	disc, err := discover.ListenV4(socket, ln, config)
+	if err != nil {
+		exit(err)
+	}
+	return disc
+}
+
+func makeDiscoveryConfig(ctx *cli.Context) (*enode.LocalNode, discover.Config) {
+	var cfg discover.Config
+
+	if ctx.IsSet(nodekeyFlag.Name) {
+		key, err := crypto.HexToECDSA(ctx.String(nodekeyFlag.Name))
+		if err != nil {
+			exit(fmt.Errorf("-%s: %v", nodekeyFlag.Name, err))
+		}
+		cfg.PrivateKey = key
+	} else {
+		cfg.PrivateKey, _ = crypto.GenerateKey()
+	}
+
+	if commandHasFlag(ctx, bootnodesFlag) {
+		bn, err := parseBootnodes(ctx)
+		if err != nil {
+			exit(err)
+		}
+		cfg.Bootnodes = bn
+	}
+
+	dbpath := ctx.String(nodedbFlag.Name)
+	db, err := enode.OpenDB(dbpath)
+	if err != nil {
+		exit(err)
+	}
+	ln := enode.NewLocalNode(db, cfg.PrivateKey)
+	return ln, cfg
+}
+
+func listen(ln *enode.LocalNode, addr string) *net.UDPConn {
+	if addr == "" {
+		addr = "0.0.0.0:0"
+	}
+	socket, err := net.ListenPacket("udp4", addr)
+	if err != nil {
+		exit(err)
+	}
+	usocket := socket.(*net.UDPConn)
+	uaddr := socket.LocalAddr().(*net.UDPAddr)
+	ln.SetFallbackIP(net.IP{127, 0, 0, 1})
+	ln.SetFallbackUDP(uaddr.Port)
+	return usocket
+}
+
 func parseBootnodes(ctx *cli.Context) ([]*enode.Node, error) {
 	s := params.RinkebyBootnodes
 	if ctx.IsSet(bootnodesFlag.Name) {
@@ -187,40 +306,3 @@ func parseBootnodes(ctx *cli.Context) ([]*enode.Node, error) {
 	}
 	return nodes, nil
 }
-
-// startV4 starts an ephemeral discovery V4 node.
-func startV4(ctx *cli.Context) *discover.UDPv4 {
-	socket, ln, cfg, err := listen()
-	if err != nil {
-		exit(err)
-	}
-	if commandHasFlag(ctx, bootnodesFlag) {
-		bn, err := parseBootnodes(ctx)
-		if err != nil {
-			exit(err)
-		}
-		cfg.Bootnodes = bn
-	}
-	disc, err := discover.ListenV4(socket, ln, cfg)
-	if err != nil {
-		exit(err)
-	}
-	return disc
-}
-
-func listen() (*net.UDPConn, *enode.LocalNode, discover.Config, error) {
-	var cfg discover.Config
-	cfg.PrivateKey, _ = crypto.GenerateKey()
-	db, _ := enode.OpenDB("")
-	ln := enode.NewLocalNode(db, cfg.PrivateKey)
-
-	socket, err := net.ListenUDP("udp4", &net.UDPAddr{IP: net.IP{0, 0, 0, 0}})
-	if err != nil {
-		db.Close()
-		return nil, nil, cfg, err
-	}
-	addr := socket.LocalAddr().(*net.UDPAddr)
-	ln.SetFallbackIP(net.IP{127, 0, 0, 1})
-	ln.SetFallbackUDP(addr.Port)
-	return socket, ln, cfg, nil
-}
--- a/cmd/devp2p/discv5cmd.go
+++ b/cmd/devp2p/discv5cmd.go
@@ -0,0 +1,123 @@
+// Copyright 2019 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/p2p/discover"
+	"gopkg.in/urfave/cli.v1"
+)
+
+var (
+	discv5Command = cli.Command{
+		Name:  "discv5",
+		Usage: "Node Discovery v5 tools",
+		Subcommands: []cli.Command{
+			discv5PingCommand,
+			discv5ResolveCommand,
+			discv5CrawlCommand,
+			discv5ListenCommand,
+		},
+	}
+	discv5PingCommand = cli.Command{
+		Name:   "ping",
+		Usage:  "Sends ping to a node",
+		Action: discv5Ping,
+	}
+	discv5ResolveCommand = cli.Command{
+		Name:   "resolve",
+		Usage:  "Finds a node in the DHT",
+		Action: discv5Resolve,
+		Flags:  []cli.Flag{bootnodesFlag},
+	}
+	discv5CrawlCommand = cli.Command{
+		Name:   "crawl",
+		Usage:  "Updates a nodes.json file with random nodes found in the DHT",
+		Action: discv5Crawl,
+		Flags:  []cli.Flag{bootnodesFlag, crawlTimeoutFlag},
+	}
+	discv5ListenCommand = cli.Command{
+		Name:   "listen",
+		Usage:  "Runs a node",
+		Action: discv5Listen,
+		Flags: []cli.Flag{
+			bootnodesFlag,
+			nodekeyFlag,
+			nodedbFlag,
+			listenAddrFlag,
+		},
+	}
+)
+
+func discv5Ping(ctx *cli.Context) error {
+	n := getNodeArg(ctx)
+	disc := startV5(ctx)
+	defer disc.Close()
+
+	fmt.Println(disc.Ping(n))
+	return nil
+}
+
+func discv5Resolve(ctx *cli.Context) error {
+	n := getNodeArg(ctx)
+	disc := startV5(ctx)
+	defer disc.Close()
+
+	fmt.Println(disc.Resolve(n))
+	return nil
+}
+
+func discv5Crawl(ctx *cli.Context) error {
+	if ctx.NArg() < 1 {
+		return fmt.Errorf("need nodes file as argument")
+	}
+	nodesFile := ctx.Args().First()
+	var inputSet nodeSet
+	if common.FileExist(nodesFile) {
+		inputSet = loadNodesJSON(nodesFile)
+	}
+
+	disc := startV5(ctx)
+	defer disc.Close()
+	c := newCrawler(inputSet, disc, disc.RandomNodes())
+	c.revalidateInterval = 10 * time.Minute
+	output := c.run(ctx.Duration(crawlTimeoutFlag.Name))
+	writeNodesJSON(nodesFile, output)
+	return nil
+}
+
+func discv5Listen(ctx *cli.Context) error {
+	disc := startV5(ctx)
+	defer disc.Close()
+
+	fmt.Println(disc.Self())
+	select {}
+}
+
+// startV5 starts an ephemeral discovery v5 node.
+func startV5(ctx *cli.Context) *discover.UDPv5 {
+	ln, config := makeDiscoveryConfig(ctx)
+	socket := listen(ln, ctx.String(listenAddrFlag.Name))
+	disc, err := discover.ListenV5(socket, ln, config)
+	if err != nil {
+		exit(err)
+	}
+	return disc
+}
--- a/cmd/devp2p/dns_cloudflare.go
+++ b/cmd/devp2p/dns_cloudflare.go
@@ -130,9 +130,9 @@ func (c *cloudflareClient) uploadRecords(name string, records map[string]string)
 		if !exists {
 			// Entry is unknown, push a new one to Cloudflare.
 			log.Info(fmt.Sprintf("Creating %s = %q", path, val))
-			ttl := 1
+			ttl := rootTTL
 			if path != name {
-				ttl = 2147483647 // Max TTL permitted by Cloudflare
+				ttl = treeNodeTTL // Max TTL permitted by Cloudflare
 			}
 			_, err = c.CreateDNSRecord(c.zoneID, cloudflare.DNSRecord{Type: "TXT", Name: path, Content: val, TTL: ttl})
 		} else if old.Content != val {
--- a/cmd/devp2p/dns_route53.go
+++ b/cmd/devp2p/dns_route53.go
@@ -0,0 +1,322 @@
+// Copyright 2019 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"errors"
+	"fmt"
+	"sort"
+	"strconv"
+	"strings"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/route53"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/p2p/dnsdisc"
+	"gopkg.in/urfave/cli.v1"
+)
+
+const (
+	// Route53 limits change sets to 32k of 'RDATA size'. Change sets are also limited to
+	// 1000 items. UPSERTs count double.
+	// https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/DNSLimitations.html#limits-api-requests-changeresourcerecordsets
+	route53ChangeSizeLimit  = 32000
+	route53ChangeCountLimit = 1000
+)
+
+var (
+	route53AccessKeyFlag = cli.StringFlag{
+		Name:   "access-key-id",
+		Usage:  "AWS Access Key ID",
+		EnvVar: "AWS_ACCESS_KEY_ID",
+	}
+	route53AccessSecretFlag = cli.StringFlag{
+		Name:   "access-key-secret",
+		Usage:  "AWS Access Key Secret",
+		EnvVar: "AWS_SECRET_ACCESS_KEY",
+	}
+	route53ZoneIDFlag = cli.StringFlag{
+		Name:  "zone-id",
+		Usage: "Route53 Zone ID",
+	}
+)
+
+type route53Client struct {
+	api    *route53.Route53
+	zoneID string
+}
+
+type recordSet struct {
+	values []string
+	ttl    int64
+}
+
+// newRoute53Client sets up a Route53 API client from command line flags.
+func newRoute53Client(ctx *cli.Context) *route53Client {
+	akey := ctx.String(route53AccessKeyFlag.Name)
+	asec := ctx.String(route53AccessSecretFlag.Name)
+	if akey == "" || asec == "" {
+		exit(fmt.Errorf("need Route53 Access Key ID and secret proceed"))
+	}
+	config := &aws.Config{Credentials: credentials.NewStaticCredentials(akey, asec, "")}
+	session, err := session.NewSession(config)
+	if err != nil {
+		exit(fmt.Errorf("can't create AWS session: %v", err))
+	}
+	return &route53Client{
+		api:    route53.New(session),
+		zoneID: ctx.String(route53ZoneIDFlag.Name),
+	}
+}
+
+// deploy uploads the given tree to Route53.
+func (c *route53Client) deploy(name string, t *dnsdisc.Tree) error {
+	if err := c.checkZone(name); err != nil {
+		return err
+	}
+
+	// Compute DNS changes.
+	existing, err := c.collectRecords(name)
+	if err != nil {
+		return err
+	}
+	log.Info(fmt.Sprintf("Found %d TXT records", len(existing)))
+
+	records := t.ToTXT(name)
+	changes := c.computeChanges(name, records, existing)
+	if len(changes) == 0 {
+		log.Info("No DNS changes needed")
+		return nil
+	}
+
+	// Submit change batches.
+	batches := splitChanges(changes, route53ChangeSizeLimit, route53ChangeCountLimit)
+	for i, changes := range batches {
+		log.Info(fmt.Sprintf("Submitting %d changes to Route53", len(changes)))
+		batch := new(route53.ChangeBatch)
+		batch.SetChanges(changes)
+		batch.SetComment(fmt.Sprintf("enrtree update %d/%d of %s at seq %d", i+1, len(batches), name, t.Seq()))
+		req := &route53.ChangeResourceRecordSetsInput{HostedZoneId: &c.zoneID, ChangeBatch: batch}
+		resp, err := c.api.ChangeResourceRecordSets(req)
+		if err != nil {
+			return err
+		}
+
+		log.Info(fmt.Sprintf("Waiting for change request %s", *resp.ChangeInfo.Id))
+		wreq := &route53.GetChangeInput{Id: resp.ChangeInfo.Id}
+		if err := c.api.WaitUntilResourceRecordSetsChanged(wreq); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// checkZone verifies zone information for the given domain.
+func (c *route53Client) checkZone(name string) (err error) {
+	if c.zoneID == "" {
+		c.zoneID, err = c.findZoneID(name)
+	}
+	return err
+}
+
+// findZoneID searches for the Zone ID containing the given domain.
+func (c *route53Client) findZoneID(name string) (string, error) {
+	log.Info(fmt.Sprintf("Finding Route53 Zone ID for %s", name))
+	var req route53.ListHostedZonesByNameInput
+	for {
+		resp, err := c.api.ListHostedZonesByName(&req)
+		if err != nil {
+			return "", err
+		}
+		for _, zone := range resp.HostedZones {
+			if isSubdomain(name, *zone.Name) {
+				return *zone.Id, nil
+			}
+		}
+		if !*resp.IsTruncated {
+			break
+		}
+		req.DNSName = resp.NextDNSName
+		req.HostedZoneId = resp.NextHostedZoneId
+	}
+	return "", errors.New("can't find zone ID for " + name)
+}
+
+// computeChanges creates DNS changes for the given record.
+func (c *route53Client) computeChanges(name string, records map[string]string, existing map[string]recordSet) []*route53.Change {
+	// Convert all names to lowercase.
+	lrecords := make(map[string]string, len(records))
+	for name, r := range records {
+		lrecords[strings.ToLower(name)] = r
+	}
+	records = lrecords
+
+	var changes []*route53.Change
+	for path, val := range records {
+		ttl := int64(rootTTL)
+		if path != name {
+			ttl = int64(treeNodeTTL)
+		}
+
+		prevRecords, exists := existing[path]
+		prevValue := strings.Join(prevRecords.values, "")
+		if !exists {
+			// Entry is unknown, push a new one
+			log.Info(fmt.Sprintf("Creating %s = %q", path, val))
+			changes = append(changes, newTXTChange("CREATE", path, ttl, splitTXT(val)))
+		} else if prevValue != val || prevRecords.ttl != ttl {
+			// Entry already exists, only change its content.
+			log.Info(fmt.Sprintf("Updating %s from %q to %q", path, prevValue, val))
+			changes = append(changes, newTXTChange("UPSERT", path, ttl, splitTXT(val)))
+		} else {
+			log.Info(fmt.Sprintf("Skipping %s = %q", path, val))
+		}
+	}
+
+	// Iterate over the old records and delete anything stale.
+	for path, set := range existing {
+		if _, ok := records[path]; ok {
+			continue
+		}
+		// Stale entry, nuke it.
+		log.Info(fmt.Sprintf("Deleting %s = %q", path, strings.Join(set.values, "")))
+		changes = append(changes, newTXTChange("DELETE", path, set.ttl, set.values...))
+	}
+
+	sortChanges(changes)
+	return changes
+}
+
+// sortChanges ensures DNS changes are in leaf-added -> root-changed -> leaf-deleted order.
+func sortChanges(changes []*route53.Change) {
+	score := map[string]int{"CREATE": 1, "UPSERT": 2, "DELETE": 3}
+	sort.Slice(changes, func(i, j int) bool {
+		if *changes[i].Action == *changes[j].Action {
+			return *changes[i].ResourceRecordSet.Name < *changes[j].ResourceRecordSet.Name
+		}
+		return score[*changes[i].Action] < score[*changes[j].Action]
+	})
+}
+
+// splitChanges splits up DNS changes such that each change batch
+// is smaller than the given RDATA limit.
+func splitChanges(changes []*route53.Change, sizeLimit, countLimit int) [][]*route53.Change {
+	var (
+		batches    [][]*route53.Change
+		batchSize  int
+		batchCount int
+	)
+	for _, ch := range changes {
+		// Start new batch if this change pushes the current one over the limit.
+		count := changeCount(ch)
+		size := changeSize(ch) * count
+		overSize := batchSize+size > sizeLimit
+		overCount := batchCount+count > countLimit
+		if len(batches) == 0 || overSize || overCount {
+			batches = append(batches, nil)
+			batchSize = 0
+			batchCount = 0
+		}
+		batches[len(batches)-1] = append(batches[len(batches)-1], ch)
+		batchSize += size
+		batchCount += count
+	}
+	return batches
+}
+
+// changeSize returns the RDATA size of a DNS change.
+func changeSize(ch *route53.Change) int {
+	size := 0
+	for _, rr := range ch.ResourceRecordSet.ResourceRecords {
+		if rr.Value != nil {
+			size += len(*rr.Value)
+		}
+	}
+	return size
+}
+
+func changeCount(ch *route53.Change) int {
+	if *ch.Action == "UPSERT" {
+		return 2
+	}
+	return 1
+}
+
+// collectRecords collects all TXT records below the given name.
+func (c *route53Client) collectRecords(name string) (map[string]recordSet, error) {
+	log.Info(fmt.Sprintf("Retrieving existing TXT records on %s (%s)", name, c.zoneID))
+	var req route53.ListResourceRecordSetsInput
+	req.SetHostedZoneId(c.zoneID)
+	existing := make(map[string]recordSet)
+	err := c.api.ListResourceRecordSetsPages(&req, func(resp *route53.ListResourceRecordSetsOutput, last bool) bool {
+		for _, set := range resp.ResourceRecordSets {
+			if !isSubdomain(*set.Name, name) || *set.Type != "TXT" {
+				continue
+			}
+			s := recordSet{ttl: *set.TTL}
+			for _, rec := range set.ResourceRecords {
+				s.values = append(s.values, *rec.Value)
+			}
+			name := strings.TrimSuffix(*set.Name, ".")
+			existing[name] = s
+		}
+		return true
+	})
+	return existing, err
+}
+
+// newTXTChange creates a change to a TXT record.
+func newTXTChange(action, name string, ttl int64, values ...string) *route53.Change {
+	var c route53.Change
+	var r route53.ResourceRecordSet
+	var rrs []*route53.ResourceRecord
+	for _, val := range values {
+		rr := new(route53.ResourceRecord)
+		rr.SetValue(val)
+		rrs = append(rrs, rr)
+	}
+	r.SetType("TXT")
+	r.SetName(name)
+	r.SetTTL(ttl)
+	r.SetResourceRecords(rrs)
+	c.SetAction(action)
+	c.SetResourceRecordSet(&r)
+	return &c
+}
+
+// isSubdomain returns true if name is a subdomain of domain.
+func isSubdomain(name, domain string) bool {
+	domain = strings.TrimSuffix(domain, ".")
+	name = strings.TrimSuffix(name, ".")
+	return strings.HasSuffix("."+name, "."+domain)
+}
+
+// splitTXT splits value into a list of quoted 255-character strings.
+func splitTXT(value string) string {
+	var result strings.Builder
+	for len(value) > 0 {
+		rlen := len(value)
+		if rlen > 253 {
+			rlen = 253
+		}
+		result.WriteString(strconv.Quote(value[:rlen]))
+		value = value[rlen:]
+	}
+	return result.String()
+}
--- a/cmd/devp2p/dns_route53_test.go
+++ b/cmd/devp2p/dns_route53_test.go
@@ -0,0 +1,166 @@
+// Copyright 2020 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/aws/aws-sdk-go/service/route53"
+)
+
+// This test checks that computeChanges/splitChanges create DNS changes in
+// leaf-added -> root-changed -> leaf-deleted order.
+func TestRoute53ChangeSort(t *testing.T) {
+	testTree0 := map[string]recordSet{
+		"2kfjogvxdqtxxugbh7gs7naaai.n": {ttl: 3333, values: []string{
+			`"enr:-HW4QO1ml1DdXLeZLsUxewnthhUy8eROqkDyoMTyavfks9JlYQIlMFEUoM78PovJDPQrAkrb3LRJ-""vtrymDguKCOIAWAgmlkgnY0iXNlY3AyNTZrMaEDffaGfJzgGhUif1JqFruZlYmA31HzathLSWxfbq_QoQ4"`,
+		}},
+		"fdxn3sn67na5dka4j2gok7bvqi.n": {ttl: treeNodeTTL, values: []string{`"enrtree-branch:"`}},
+		"n":                            {ttl: rootTTL, values: []string{`"enrtree-root:v1 e=2KFJOGVXDQTXXUGBH7GS7NAAAI l=FDXN3SN67NA5DKA4J2GOK7BVQI seq=0 sig=v_-J_q_9ICQg5ztExFvLQhDBGMb0lZPJLhe3ts9LAcgqhOhtT3YFJsl8BWNDSwGtamUdR-9xl88_w-X42SVpjwE"`}},
+	}
+
+	testTree1 := map[string]string{
+		"n":                            "enrtree-root:v1 e=JWXYDBPXYWG6FX3GMDIBFA6CJ4 l=C7HRFPF3BLGF3YR4DY5KX3SMBE seq=1 sig=o908WmNp7LibOfPsr4btQwatZJ5URBr2ZAuxvK4UWHlsB9sUOTJQaGAlLPVAhM__XJesCHxLISo94z5Z2a463gA",
+		"C7HRFPF3BLGF3YR4DY5KX3SMBE.n": "enrtree://AM5FCQLWIZX2QFPNJAP7VUERCCRNGRHWZG3YYHIUV7BVDQ5FDPRT2@morenodes.example.org",
+		"JWXYDBPXYWG6FX3GMDIBFA6CJ4.n": "enrtree-branch:2XS2367YHAXJFGLZHVAWLQD4ZY,H4FHT4B454P6UXFD7JCYQ5PWDY,MHTDO6TMUBRIA2XWG5LUDACK24",
+		"2XS2367YHAXJFGLZHVAWLQD4ZY.n": "enr:-HW4QOFzoVLaFJnNhbgMoDXPnOvcdVuj7pDpqRvh6BRDO68aVi5ZcjB3vzQRZH2IcLBGHzo8uUN3snqmgTiE56CH3AMBgmlkgnY0iXNlY3AyNTZrMaECC2_24YYkYHEgdzxlSNKQEnHhuNAbNlMlWJxrJxbAFvA",
+		"H4FHT4B454P6UXFD7JCYQ5PWDY.n": "enr:-HW4QAggRauloj2SDLtIHN1XBkvhFZ1vtf1raYQp9TBW2RD5EEawDzbtSmlXUfnaHcvwOizhVYLtr7e6vw7NAf6mTuoCgmlkgnY0iXNlY3AyNTZrMaECjrXI8TLNXU0f8cthpAMxEshUyQlK-AM0PW2wfrnacNI",
+		"MHTDO6TMUBRIA2XWG5LUDACK24.n": "enr:-HW4QLAYqmrwllBEnzWWs7I5Ev2IAs7x_dZlbYdRdMUx5EyKHDXp7AV5CkuPGUPdvbv1_Ms1CPfhcGCvSElSosZmyoqAgmlkgnY0iXNlY3AyNTZrMaECriawHKWdDRk2xeZkrOXBQ0dfMFLHY4eENZwdufn1S1o",
+	}
+
+	wantChanges := []*route53.Change{
+		{
+			Action: sp("CREATE"),
+			ResourceRecordSet: &route53.ResourceRecordSet{
+				Name: sp("2xs2367yhaxjfglzhvawlqd4zy.n"),
+				ResourceRecords: []*route53.ResourceRecord{{
+					Value: sp(`"enr:-HW4QOFzoVLaFJnNhbgMoDXPnOvcdVuj7pDpqRvh6BRDO68aVi5ZcjB3vzQRZH2IcLBGHzo8uUN3snqmgTiE56CH3AMBgmlkgnY0iXNlY3AyNTZrMaECC2_24YYkYHEgdzxlSNKQEnHhuNAbNlMlWJxrJxbAFvA"`),
+				}},
+				TTL:  ip(treeNodeTTL),
+				Type: sp("TXT"),
+			},
+		},
+		{
+			Action: sp("CREATE"),
+			ResourceRecordSet: &route53.ResourceRecordSet{
+				Name: sp("c7hrfpf3blgf3yr4dy5kx3smbe.n"),
+				ResourceRecords: []*route53.ResourceRecord{{
+					Value: sp(`"enrtree://AM5FCQLWIZX2QFPNJAP7VUERCCRNGRHWZG3YYHIUV7BVDQ5FDPRT2@morenodes.example.org"`),
+				}},
+				TTL:  ip(treeNodeTTL),
+				Type: sp("TXT"),
+			},
+		},
+		{
+			Action: sp("CREATE"),
+			ResourceRecordSet: &route53.ResourceRecordSet{
+				Name: sp("h4fht4b454p6uxfd7jcyq5pwdy.n"),
+				ResourceRecords: []*route53.ResourceRecord{{
+					Value: sp(`"enr:-HW4QAggRauloj2SDLtIHN1XBkvhFZ1vtf1raYQp9TBW2RD5EEawDzbtSmlXUfnaHcvwOizhVYLtr7e6vw7NAf6mTuoCgmlkgnY0iXNlY3AyNTZrMaECjrXI8TLNXU0f8cthpAMxEshUyQlK-AM0PW2wfrnacNI"`),
+				}},
+				TTL:  ip(treeNodeTTL),
+				Type: sp("TXT"),
+			},
+		},
+		{
+			Action: sp("CREATE"),
+			ResourceRecordSet: &route53.ResourceRecordSet{
+				Name: sp("jwxydbpxywg6fx3gmdibfa6cj4.n"),
+				ResourceRecords: []*route53.ResourceRecord{{
+					Value: sp(`"enrtree-branch:2XS2367YHAXJFGLZHVAWLQD4ZY,H4FHT4B454P6UXFD7JCYQ5PWDY,MHTDO6TMUBRIA2XWG5LUDACK24"`),
+				}},
+				TTL:  ip(treeNodeTTL),
+				Type: sp("TXT"),
+			},
+		},
+		{
+			Action: sp("CREATE"),
+			ResourceRecordSet: &route53.ResourceRecordSet{
+				Name: sp("mhtdo6tmubria2xwg5ludack24.n"),
+				ResourceRecords: []*route53.ResourceRecord{{
+					Value: sp(`"enr:-HW4QLAYqmrwllBEnzWWs7I5Ev2IAs7x_dZlbYdRdMUx5EyKHDXp7AV5CkuPGUPdvbv1_Ms1CPfhcGCvSElSosZmyoqAgmlkgnY0iXNlY3AyNTZrMaECriawHKWdDRk2xeZkrOXBQ0dfMFLHY4eENZwdufn1S1o"`),
+				}},
+				TTL:  ip(treeNodeTTL),
+				Type: sp("TXT"),
+			},
+		},
+		{
+			Action: sp("UPSERT"),
+			ResourceRecordSet: &route53.ResourceRecordSet{
+				Name: sp("n"),
+				ResourceRecords: []*route53.ResourceRecord{{
+					Value: sp(`"enrtree-root:v1 e=JWXYDBPXYWG6FX3GMDIBFA6CJ4 l=C7HRFPF3BLGF3YR4DY5KX3SMBE seq=1 sig=o908WmNp7LibOfPsr4btQwatZJ5URBr2ZAuxvK4UWHlsB9sUOTJQaGAlLPVAhM__XJesCHxLISo94z5Z2a463gA"`),
+				}},
+				TTL:  ip(rootTTL),
+				Type: sp("TXT"),
+			},
+		},
+		{
+			Action: sp("DELETE"),
+			ResourceRecordSet: &route53.ResourceRecordSet{
+				Name: sp("2kfjogvxdqtxxugbh7gs7naaai.n"),
+				ResourceRecords: []*route53.ResourceRecord{
+					{Value: sp(`"enr:-HW4QO1ml1DdXLeZLsUxewnthhUy8eROqkDyoMTyavfks9JlYQIlMFEUoM78PovJDPQrAkrb3LRJ-""vtrymDguKCOIAWAgmlkgnY0iXNlY3AyNTZrMaEDffaGfJzgGhUif1JqFruZlYmA31HzathLSWxfbq_QoQ4"`)},
+				},
+				TTL:  ip(3333),
+				Type: sp("TXT"),
+			},
+		},
+		{
+			Action: sp("DELETE"),
+			ResourceRecordSet: &route53.ResourceRecordSet{
+				Name: sp("fdxn3sn67na5dka4j2gok7bvqi.n"),
+				ResourceRecords: []*route53.ResourceRecord{{
+					Value: sp(`"enrtree-branch:"`),
+				}},
+				TTL:  ip(treeNodeTTL),
+				Type: sp("TXT"),
+			},
+		},
+	}
+
+	var client route53Client
+	changes := client.computeChanges("n", testTree1, testTree0)
+	if !reflect.DeepEqual(changes, wantChanges) {
+		t.Fatalf("wrong changes (got %d, want %d)", len(changes), len(wantChanges))
+	}
+
+	// Check splitting according to size.
+	wantSplit := [][]*route53.Change{
+		wantChanges[:4],
+		wantChanges[4:6],
+		wantChanges[6:],
+	}
+	split := splitChanges(changes, 600, 4000)
+	if !reflect.DeepEqual(split, wantSplit) {
+		t.Fatalf("wrong split batches: got %d, want %d", len(split), len(wantSplit))
+	}
+
+	// Check splitting according to count.
+	wantSplit = [][]*route53.Change{
+		wantChanges[:5],
+		wantChanges[5:],
+	}
+	split = splitChanges(changes, 10000, 6)
+	if !reflect.DeepEqual(split, wantSplit) {
+		t.Fatalf("wrong split batches: got %d, want %d", len(split), len(wantSplit))
+	}
+}
+
+func sp(s string) *string { return &s }
+func ip(i int64) *int64   { return &i }
--- a/cmd/devp2p/dnscmd.go
+++ b/cmd/devp2p/dnscmd.go
@@ -27,7 +27,7 @@ import (

 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/console"
+	"github.com/ethereum/go-ethereum/console/prompt"
 	"github.com/ethereum/go-ethereum/p2p/dnsdisc"
 	"github.com/ethereum/go-ethereum/p2p/enode"
 	cli "gopkg.in/urfave/cli.v1"
@@ -42,6 +42,7 @@ var (
 			dnsSignCommand,
 			dnsTXTCommand,
 			dnsCloudflareCommand,
+			dnsRoute53Command,
 		},
 	}
 	dnsSyncCommand = cli.Command{
@@ -66,11 +67,18 @@ var (
 	}
 	dnsCloudflareCommand = cli.Command{
 		Name:      "to-cloudflare",
-		Usage:     "Deploy DNS TXT records to cloudflare",
+		Usage:     "Deploy DNS TXT records to CloudFlare",
 		ArgsUsage: "<tree-directory>",
 		Action:    dnsToCloudflare,
 		Flags:     []cli.Flag{cloudflareTokenFlag, cloudflareZoneIDFlag},
 	}
+	dnsRoute53Command = cli.Command{
+		Name:      "to-route53",
+		Usage:     "Deploy DNS TXT records to Amazon Route53",
+		ArgsUsage: "<tree-directory>",
+		Action:    dnsToRoute53,
+		Flags:     []cli.Flag{route53AccessKeyFlag, route53AccessSecretFlag, route53ZoneIDFlag},
+	}
 )

 var (
@@ -88,6 +96,11 @@ var (
 	}
 )

+const (
+	rootTTL     = 30 * 60              // 30 min
+	treeNodeTTL = 4 * 7 * 24 * 60 * 60 // 4 weeks
+)
+
 // dnsSync performs dnsSyncCommand.
 func dnsSync(ctx *cli.Context) error {
 	var (
@@ -194,13 +207,26 @@ func dnsToCloudflare(ctx *cli.Context) error {
 	return client.deploy(domain, t)
 }

+// dnsToRoute53 peforms dnsRoute53Command.
+func dnsToRoute53(ctx *cli.Context) error {
+	if ctx.NArg() < 1 {
+		return fmt.Errorf("need tree definition directory as argument")
+	}
+	domain, t, err := loadTreeDefinitionForExport(ctx.Args().Get(0))
+	if err != nil {
+		return err
+	}
+	client := newRoute53Client(ctx)
+	return client.deploy(domain, t)
+}
+
 // loadSigningKey loads a private key in Ethereum keystore format.
 func loadSigningKey(keyfile string) *ecdsa.PrivateKey {
 	keyjson, err := ioutil.ReadFile(keyfile)
 	if err != nil {
 		exit(fmt.Errorf("failed to read the keyfile at '%s': %v", keyfile, err))
 	}
-	password, _ := console.Stdin.PromptPassword("Please enter the password for '" + keyfile + "': ")
+	password, _ := prompt.Stdin.PromptPassword("Please enter the password for '" + keyfile + "': ")
 	key, err := keystore.DecryptKey(keyjson, password)
 	if err != nil {
 		exit(fmt.Errorf("error decrypting key: %v", err))
@@ -214,8 +240,7 @@ func dnsClient(ctx *cli.Context) *dnsdisc.Client {
 	if commandHasFlag(ctx, dnsTimeoutFlag) {
 		cfg.Timeout = ctx.Duration(dnsTimeoutFlag.Name)
 	}
-	c, _ := dnsdisc.NewClient(cfg) // cannot fail because no URLs given
-	return c
+	return dnsdisc.NewClient(cfg)
 }

 // There are two file formats for DNS node trees on disk:
--- a/cmd/devp2p/internal/v4test/discv4tests.go
+++ b/cmd/devp2p/internal/v4test/discv4tests.go
@@ -0,0 +1,467 @@
+// Copyright 2020 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package v4test
+
+import (
+	"bytes"
+	"crypto/rand"
+	"fmt"
+	"net"
+	"reflect"
+	"time"
+
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/internal/utesting"
+	"github.com/ethereum/go-ethereum/p2p/discover/v4wire"
+)
+
+const (
+	expiration  = 20 * time.Second
+	wrongPacket = 66
+	macSize     = 256 / 8
+)
+
+var (
+	// Remote node under test
+	Remote string
+	// IP where the first tester is listening, port will be assigned
+	Listen1 string = "127.0.0.1"
+	// IP where the second tester is listening, port will be assigned
+	// Before running the test, you may have to `sudo ifconfig lo0 add 127.0.0.2` (on MacOS at least)
+	Listen2 string = "127.0.0.2"
+)
+
+type pingWithJunk struct {
+	Version    uint
+	From, To   v4wire.Endpoint
+	Expiration uint64
+	JunkData1  uint
+	JunkData2  []byte
+}
+
+func (req *pingWithJunk) Name() string { return "PING/v4" }
+func (req *pingWithJunk) Kind() byte   { return v4wire.PingPacket }
+
+type pingWrongType struct {
+	Version    uint
+	From, To   v4wire.Endpoint
+	Expiration uint64
+}
+
+func (req *pingWrongType) Name() string { return "WRONG/v4" }
+func (req *pingWrongType) Kind() byte   { return wrongPacket }
+
+func futureExpiration() uint64 {
+	return uint64(time.Now().Add(expiration).Unix())
+}
+
+// This test just sends a PING packet and expects a response.
+func BasicPing(t *utesting.T) {
+	te := newTestEnv(Remote, Listen1, Listen2)
+	defer te.close()
+
+	pingHash := te.send(te.l1, &v4wire.Ping{
+		Version:    4,
+		From:       te.localEndpoint(te.l1),
+		To:         te.remoteEndpoint(),
+		Expiration: futureExpiration(),
+	})
+
+	reply, _, _ := te.read(te.l1)
+	if err := te.checkPong(reply, pingHash); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// checkPong verifies that reply is a valid PONG matching the given ping hash.
+func (te *testenv) checkPong(reply v4wire.Packet, pingHash []byte) error {
+	if reply == nil || reply.Kind() != v4wire.PongPacket {
+		return fmt.Errorf("expected PONG reply, got %v", reply)
+	}
+	pong := reply.(*v4wire.Pong)
+	if !bytes.Equal(pong.ReplyTok, pingHash) {
+		return fmt.Errorf("PONG reply token mismatch: got %x, want %x", pong.ReplyTok, pingHash)
+	}
+	wantEndpoint := te.localEndpoint(te.l1)
+	if !reflect.DeepEqual(pong.To, wantEndpoint) {
+		return fmt.Errorf("PONG 'to' endpoint mismatch: got %+v, want %+v", pong.To, wantEndpoint)
+	}
+	if v4wire.Expired(pong.Expiration) {
+		return fmt.Errorf("PONG is expired (%v)", pong.Expiration)
+	}
+	return nil
+}
+
+// This test sends a PING packet with wrong 'to' field and expects a PONG response.
+func PingWrongTo(t *utesting.T) {
+	te := newTestEnv(Remote, Listen1, Listen2)
+	defer te.close()
+
+	wrongEndpoint := v4wire.Endpoint{IP: net.ParseIP("192.0.2.0")}
+	pingHash := te.send(te.l1, &v4wire.Ping{
+		Version:    4,
+		From:       te.localEndpoint(te.l1),
+		To:         wrongEndpoint,
+		Expiration: futureExpiration(),
+	})
+
+	reply, _, _ := te.read(te.l1)
+	if err := te.checkPong(reply, pingHash); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// This test sends a PING packet with wrong 'from' field and expects a PONG response.
+func PingWrongFrom(t *utesting.T) {
+	te := newTestEnv(Remote, Listen1, Listen2)
+	defer te.close()
+
+	wrongEndpoint := v4wire.Endpoint{IP: net.ParseIP("192.0.2.0")}
+	pingHash := te.send(te.l1, &v4wire.Ping{
+		Version:    4,
+		From:       wrongEndpoint,
+		To:         te.remoteEndpoint(),
+		Expiration: futureExpiration(),
+	})
+
+	reply, _, _ := te.read(te.l1)
+	if err := te.checkPong(reply, pingHash); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// This test sends a PING packet with additional data at the end and expects a PONG
+// response. The remote node should respond because EIP-8 mandates ignoring additional
+// trailing data.
+func PingExtraData(t *utesting.T) {
+	te := newTestEnv(Remote, Listen1, Listen2)
+	defer te.close()
+
+	pingHash := te.send(te.l1, &pingWithJunk{
+		Version:    4,
+		From:       te.localEndpoint(te.l1),
+		To:         te.remoteEndpoint(),
+		Expiration: futureExpiration(),
+		JunkData1:  42,
+		JunkData2:  []byte{9, 8, 7, 6, 5, 4, 3, 2, 1},
+	})
+
+	reply, _, _ := te.read(te.l1)
+	if err := te.checkPong(reply, pingHash); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// This test sends a PING packet with additional data and wrong 'from' field
+// and expects a PONG response.
+func PingExtraDataWrongFrom(t *utesting.T) {
+	te := newTestEnv(Remote, Listen1, Listen2)
+	defer te.close()
+
+	wrongEndpoint := v4wire.Endpoint{IP: net.ParseIP("192.0.2.0")}
+	req := pingWithJunk{
+		Version:    4,
+		From:       wrongEndpoint,
+		To:         te.remoteEndpoint(),
+		Expiration: futureExpiration(),
+		JunkData1:  42,
+		JunkData2:  []byte{9, 8, 7, 6, 5, 4, 3, 2, 1},
+	}
+	pingHash := te.send(te.l1, &req)
+	reply, _, _ := te.read(te.l1)
+	if err := te.checkPong(reply, pingHash); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// This test sends a PING packet with an expiration in the past.
+// The remote node should not respond.
+func PingPastExpiration(t *utesting.T) {
+	te := newTestEnv(Remote, Listen1, Listen2)
+	defer te.close()
+
+	te.send(te.l1, &v4wire.Ping{
+		Version:    4,
+		From:       te.localEndpoint(te.l1),
+		To:         te.remoteEndpoint(),
+		Expiration: -futureExpiration(),
+	})
+
+	reply, _, _ := te.read(te.l1)
+	if reply != nil {
+		t.Fatal("Expected no reply, got", reply)
+	}
+}
+
+// This test sends an invalid packet. The remote node should not respond.
+func WrongPacketType(t *utesting.T) {
+	te := newTestEnv(Remote, Listen1, Listen2)
+	defer te.close()
+
+	te.send(te.l1, &pingWrongType{
+		Version:    4,
+		From:       te.localEndpoint(te.l1),
+		To:         te.remoteEndpoint(),
+		Expiration: futureExpiration(),
+	})
+
+	reply, _, _ := te.read(te.l1)
+	if reply != nil {
+		t.Fatal("Expected no reply, got", reply)
+	}
+}
+
+// This test verifies that the default behaviour of ignoring 'from' fields is unaffected by
+// the bonding process. After bonding, it pings the target with a different from endpoint.
+func BondThenPingWithWrongFrom(t *utesting.T) {
+	te := newTestEnv(Remote, Listen1, Listen2)
+	defer te.close()
+	bond(t, te)
+
+	wrongEndpoint := v4wire.Endpoint{IP: net.ParseIP("192.0.2.0")}
+	pingHash := te.send(te.l1, &v4wire.Ping{
+		Version:    4,
+		From:       wrongEndpoint,
+		To:         te.remoteEndpoint(),
+		Expiration: futureExpiration(),
+	})
+
+	reply, _, _ := te.read(te.l1)
+	if err := te.checkPong(reply, pingHash); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// This test just sends FINDNODE. The remote node should not reply
+// because the endpoint proof has not completed.
+func FindnodeWithoutEndpointProof(t *utesting.T) {
+	te := newTestEnv(Remote, Listen1, Listen2)
+	defer te.close()
+
+	req := v4wire.Findnode{Expiration: futureExpiration()}
+	rand.Read(req.Target[:])
+	te.send(te.l1, &req)
+
+	reply, _, _ := te.read(te.l1)
+	if reply != nil {
+		t.Fatal("Expected no response, got", reply)
+	}
+}
+
+// BasicFindnode sends a FINDNODE request after performing the endpoint
+// proof. The remote node should respond.
+func BasicFindnode(t *utesting.T) {
+	te := newTestEnv(Remote, Listen1, Listen2)
+	defer te.close()
+	bond(t, te)
+
+	findnode := v4wire.Findnode{Expiration: futureExpiration()}
+	rand.Read(findnode.Target[:])
+	te.send(te.l1, &findnode)
+
+	reply, _, err := te.read(te.l1)
+	if err != nil {
+		t.Fatal("read find nodes", err)
+	}
+	if reply.Kind() != v4wire.NeighborsPacket {
+		t.Fatal("Expected neighbors, got", reply.Name())
+	}
+}
+
+// This test sends an unsolicited NEIGHBORS packet after the endpoint proof, then sends
+// FINDNODE to read the remote table. The remote node should not return the node contained
+// in the unsolicited NEIGHBORS packet.
+func UnsolicitedNeighbors(t *utesting.T) {
+	te := newTestEnv(Remote, Listen1, Listen2)
+	defer te.close()
+	bond(t, te)
+
+	// Send unsolicited NEIGHBORS response.
+	fakeKey, _ := crypto.GenerateKey()
+	encFakeKey := v4wire.EncodePubkey(&fakeKey.PublicKey)
+	neighbors := v4wire.Neighbors{
+		Expiration: futureExpiration(),
+		Nodes: []v4wire.Node{{
+			ID:  encFakeKey,
+			IP:  net.IP{1, 2, 3, 4},
+			UDP: 30303,
+			TCP: 30303,
+		}},
+	}
+	te.send(te.l1, &neighbors)
+
+	// Check if the remote node included the fake node.
+	te.send(te.l1, &v4wire.Findnode{
+		Expiration: futureExpiration(),
+		Target:     encFakeKey,
+	})
+
+	reply, _, err := te.read(te.l1)
+	if err != nil {
+		t.Fatal("read find nodes", err)
+	}
+	if reply.Kind() != v4wire.NeighborsPacket {
+		t.Fatal("Expected neighbors, got", reply.Name())
+	}
+	nodes := reply.(*v4wire.Neighbors).Nodes
+	if contains(nodes, encFakeKey) {
+		t.Fatal("neighbors response contains node from earlier unsolicited neighbors response")
+	}
+}
+
+// This test sends FINDNODE with an expiration timestamp in the past.
+// The remote node should not respond.
+func FindnodePastExpiration(t *utesting.T) {
+	te := newTestEnv(Remote, Listen1, Listen2)
+	defer te.close()
+	bond(t, te)
+
+	findnode := v4wire.Findnode{Expiration: -futureExpiration()}
+	rand.Read(findnode.Target[:])
+	te.send(te.l1, &findnode)
+
+	for {
+		reply, _, _ := te.read(te.l1)
+		if reply == nil {
+			return
+		} else if reply.Kind() == v4wire.NeighborsPacket {
+			t.Fatal("Unexpected NEIGHBORS response for expired FINDNODE request")
+		}
+	}
+}
+
+// bond performs the endpoint proof with the remote node.
+func bond(t *utesting.T, te *testenv) {
+	te.send(te.l1, &v4wire.Ping{
+		Version:    4,
+		From:       te.localEndpoint(te.l1),
+		To:         te.remoteEndpoint(),
+		Expiration: futureExpiration(),
+	})
+
+	var gotPing, gotPong bool
+	for !gotPing || !gotPong {
+		req, hash, err := te.read(te.l1)
+		if err != nil {
+			t.Fatal(err)
+		}
+		switch req.(type) {
+		case *v4wire.Ping:
+			te.send(te.l1, &v4wire.Pong{
+				To:         te.remoteEndpoint(),
+				ReplyTok:   hash,
+				Expiration: futureExpiration(),
+			})
+			gotPing = true
+		case *v4wire.Pong:
+			// TODO: maybe verify pong data here
+			gotPong = true
+		}
+	}
+}
+
+// This test attempts to perform a traffic amplification attack against a
+// 'victim' endpoint using FINDNODE. In this attack scenario, the attacker
+// attempts to complete the endpoint proof non-interactively by sending a PONG
+// with mismatching reply token from the 'victim' endpoint. The attack works if
+// the remote node does not verify the PONG reply token field correctly. The
+// attacker could then perform traffic amplification by sending many FINDNODE
+// requests to the discovery node, which would reply to the 'victim' address.
+func FindnodeAmplificationInvalidPongHash(t *utesting.T) {
+	te := newTestEnv(Remote, Listen1, Listen2)
+	defer te.close()
+
+	// Send PING to start endpoint verification.
+	te.send(te.l1, &v4wire.Ping{
+		Version:    4,
+		From:       te.localEndpoint(te.l1),
+		To:         te.remoteEndpoint(),
+		Expiration: futureExpiration(),
+	})
+
+	var gotPing, gotPong bool
+	for !gotPing || !gotPong {
+		req, _, err := te.read(te.l1)
+		if err != nil {
+			t.Fatal(err)
+		}
+		switch req.(type) {
+		case *v4wire.Ping:
+			// Send PONG from this node ID, but with invalid ReplyTok.
+			te.send(te.l1, &v4wire.Pong{
+				To:         te.remoteEndpoint(),
+				ReplyTok:   make([]byte, macSize),
+				Expiration: futureExpiration(),
+			})
+			gotPing = true
+		case *v4wire.Pong:
+			gotPong = true
+		}
+	}
+
+	// Now send FINDNODE. The remote node should not respond because our
+	// PONG did not reference the PING hash.
+	findnode := v4wire.Findnode{Expiration: futureExpiration()}
+	rand.Read(findnode.Target[:])
+	te.send(te.l1, &findnode)
+
+	// If we receive a NEIGHBORS response, the attack worked and the test fails.
+	reply, _, _ := te.read(te.l1)
+	if reply != nil && reply.Kind() == v4wire.NeighborsPacket {
+		t.Error("Got neighbors")
+	}
+}
+
+// This test attempts to perform a traffic amplification attack using FINDNODE.
+// The attack works if the remote node does not verify the IP address of FINDNODE
+// against the endpoint verification proof done by PING/PONG.
+func FindnodeAmplificationWrongIP(t *utesting.T) {
+	te := newTestEnv(Remote, Listen1, Listen2)
+	defer te.close()
+
+	// Do the endpoint proof from the l1 IP.
+	bond(t, te)
+
+	// Now send FINDNODE from the same node ID, but different IP address.
+	// The remote node should not respond.
+	findnode := v4wire.Findnode{Expiration: futureExpiration()}
+	rand.Read(findnode.Target[:])
+	te.send(te.l2, &findnode)
+
+	// If we receive a NEIGHBORS response, the attack worked and the test fails.
+	reply, _, _ := te.read(te.l2)
+	if reply != nil {
+		t.Error("Got NEIGHORS response for FINDNODE from wrong IP")
+	}
+}
+
+var AllTests = []utesting.Test{
+	{Name: "Ping/Basic", Fn: BasicPing},
+	{Name: "Ping/WrongTo", Fn: PingWrongTo},
+	{Name: "Ping/WrongFrom", Fn: PingWrongFrom},
+	{Name: "Ping/ExtraData", Fn: PingExtraData},
+	{Name: "Ping/ExtraDataWrongFrom", Fn: PingExtraDataWrongFrom},
+	{Name: "Ping/PastExpiration", Fn: PingPastExpiration},
+	{Name: "Ping/WrongPacketType", Fn: WrongPacketType},
+	{Name: "Ping/BondThenPingWithWrongFrom", Fn: BondThenPingWithWrongFrom},
+	{Name: "Findnode/WithoutEndpointProof", Fn: FindnodeWithoutEndpointProof},
+	{Name: "Findnode/BasicFindnode", Fn: BasicFindnode},
+	{Name: "Findnode/UnsolicitedNeighbors", Fn: UnsolicitedNeighbors},
+	{Name: "Findnode/PastExpiration", Fn: FindnodePastExpiration},
+	{Name: "Amplification/InvalidPongHash", Fn: FindnodeAmplificationInvalidPongHash},
+	{Name: "Amplification/WrongIP", Fn: FindnodeAmplificationWrongIP},
+}
--- a/cmd/devp2p/internal/v4test/framework.go
+++ b/cmd/devp2p/internal/v4test/framework.go
@@ -0,0 +1,123 @@
+// Copyright 2020 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package v4test
+
+import (
+	"crypto/ecdsa"
+	"fmt"
+	"net"
+	"time"
+
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/p2p/discover/v4wire"
+	"github.com/ethereum/go-ethereum/p2p/enode"
+)
+
+const waitTime = 300 * time.Millisecond
+
+type testenv struct {
+	l1, l2     net.PacketConn
+	key        *ecdsa.PrivateKey
+	remote     *enode.Node
+	remoteAddr *net.UDPAddr
+}
+
+func newTestEnv(remote string, listen1, listen2 string) *testenv {
+	l1, err := net.ListenPacket("udp", fmt.Sprintf("%v:0", listen1))
+	if err != nil {
+		panic(err)
+	}
+	l2, err := net.ListenPacket("udp", fmt.Sprintf("%v:0", listen2))
+	if err != nil {
+		panic(err)
+	}
+	key, err := crypto.GenerateKey()
+	if err != nil {
+		panic(err)
+	}
+	node, err := enode.Parse(enode.ValidSchemes, remote)
+	if err != nil {
+		panic(err)
+	}
+	if node.IP() == nil || node.UDP() == 0 {
+		var ip net.IP
+		var tcpPort, udpPort int
+		if ip = node.IP(); ip == nil {
+			ip = net.ParseIP("127.0.0.1")
+		}
+		if tcpPort = node.TCP(); tcpPort == 0 {
+			tcpPort = 30303
+		}
+		if udpPort = node.TCP(); udpPort == 0 {
+			udpPort = 30303
+		}
+		node = enode.NewV4(node.Pubkey(), ip, tcpPort, udpPort)
+	}
+	addr := &net.UDPAddr{IP: node.IP(), Port: node.UDP()}
+	return &testenv{l1, l2, key, node, addr}
+}
+
+func (te *testenv) close() {
+	te.l1.Close()
+	te.l2.Close()
+}
+
+func (te *testenv) send(c net.PacketConn, req v4wire.Packet) []byte {
+	packet, hash, err := v4wire.Encode(te.key, req)
+	if err != nil {
+		panic(fmt.Errorf("can't encode %v packet: %v", req.Name(), err))
+	}
+	if _, err := c.WriteTo(packet, te.remoteAddr); err != nil {
+		panic(fmt.Errorf("can't send %v: %v", req.Name(), err))
+	}
+	return hash
+}
+
+func (te *testenv) read(c net.PacketConn) (v4wire.Packet, []byte, error) {
+	buf := make([]byte, 2048)
+	if err := c.SetReadDeadline(time.Now().Add(waitTime)); err != nil {
+		return nil, nil, err
+	}
+	n, _, err := c.ReadFrom(buf)
+	if err != nil {
+		return nil, nil, err
+	}
+	p, _, hash, err := v4wire.Decode(buf[:n])
+	return p, hash, err
+}
+
+func (te *testenv) localEndpoint(c net.PacketConn) v4wire.Endpoint {
+	addr := c.LocalAddr().(*net.UDPAddr)
+	return v4wire.Endpoint{
+		IP:  addr.IP.To4(),
+		UDP: uint16(addr.Port),
+		TCP: 0,
+	}
+}
+
+func (te *testenv) remoteEndpoint() v4wire.Endpoint {
+	return v4wire.NewEndpoint(te.remoteAddr, 0)
+}
+
+func contains(ns []v4wire.Node, key v4wire.Pubkey) bool {
+	for _, n := range ns {
+		if n.ID == key {
+			return true
+		}
+	}
+	return false
+}
--- a/cmd/devp2p/keycmd.go
+++ b/cmd/devp2p/keycmd.go
@@ -0,0 +1,105 @@
+// Copyright 2020 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/p2p/enode"
+	"gopkg.in/urfave/cli.v1"
+)
+
+var (
+	keyCommand = cli.Command{
+		Name:  "key",
+		Usage: "Operations on node keys",
+		Subcommands: []cli.Command{
+			keyGenerateCommand,
+			keyToNodeCommand,
+		},
+	}
+	keyGenerateCommand = cli.Command{
+		Name:      "generate",
+		Usage:     "Generates node key files",
+		ArgsUsage: "keyfile",
+		Action:    genkey,
+	}
+	keyToNodeCommand = cli.Command{
+		Name:      "to-enode",
+		Usage:     "Creates an enode URL from a node key file",
+		ArgsUsage: "keyfile",
+		Action:    keyToURL,
+		Flags:     []cli.Flag{hostFlag, tcpPortFlag, udpPortFlag},
+	}
+)
+
+var (
+	hostFlag = cli.StringFlag{
+		Name:  "ip",
+		Usage: "IP address of the node",
+		Value: "127.0.0.1",
+	}
+	tcpPortFlag = cli.IntFlag{
+		Name:  "tcp",
+		Usage: "TCP port of the node",
+		Value: 30303,
+	}
+	udpPortFlag = cli.IntFlag{
+		Name:  "udp",
+		Usage: "UDP port of the node",
+		Value: 30303,
+	}
+)
+
+func genkey(ctx *cli.Context) error {
+	if ctx.NArg() != 1 {
+		return fmt.Errorf("need key file as argument")
+	}
+	file := ctx.Args().Get(0)
+
+	key, err := crypto.GenerateKey()
+	if err != nil {
+		return fmt.Errorf("could not generate key: %v", err)
+	}
+	return crypto.SaveECDSA(file, key)
+}
+
+func keyToURL(ctx *cli.Context) error {
+	if ctx.NArg() != 1 {
+		return fmt.Errorf("need key file as argument")
+	}
+
+	var (
+		file = ctx.Args().Get(0)
+		host = ctx.String(hostFlag.Name)
+		tcp  = ctx.Int(tcpPortFlag.Name)
+		udp  = ctx.Int(udpPortFlag.Name)
+	)
+	key, err := crypto.LoadECDSA(file)
+	if err != nil {
+		return err
+	}
+	ip := net.ParseIP(host)
+	if ip == nil {
+		return fmt.Errorf("invalid IP address %q", host)
+	}
+	node := enode.NewV4(&key.PublicKey, ip, tcp, udp)
+	fmt.Println(node.URLv4())
+	return nil
+}
--- a/cmd/devp2p/main.go
+++ b/cmd/devp2p/main.go
@@ -45,7 +45,7 @@ func init() {
 	// Set up the CLI app.
 	app.Flags = append(app.Flags, debug.Flags...)
 	app.Before = func(ctx *cli.Context) error {
-		return debug.Setup(ctx, "")
+		return debug.Setup(ctx)
 	}
 	app.After = func(ctx *cli.Context) error {
 		debug.Exit()
@@ -58,7 +58,9 @@ func init() {
 	// Add subcommands.
 	app.Commands = []cli.Command{
 		enrdumpCommand,
+		keyCommand,
 		discv4Command,
+		discv5Command,
 		dnsCommand,
 		nodesetCommand,
 	}
--- a/cmd/devp2p/nodesetcmd.go
+++ b/cmd/devp2p/nodesetcmd.go
@@ -164,7 +164,7 @@ func ethFilter(args []string) (nodeFilter, error) {
 	case "goerli":
 		filter = forkid.NewStaticFilter(params.GoerliChainConfig, params.GoerliGenesisHash)
 	case "ropsten":
-		filter = forkid.NewStaticFilter(params.TestnetChainConfig, params.TestnetGenesisHash)
+		filter = forkid.NewStaticFilter(params.RopstenChainConfig, params.RopstenGenesisHash)
 	default:
 		return nil, fmt.Errorf("unknown network %q", args[0])
 	}
--- a/cmd/ethkey/changepassword.go
+++ b/cmd/ethkey/changepassword.go
@@ -51,7 +51,7 @@ Change the password of a keyfile.`,
 		}

 		// Decrypt key with passphrase.
-		passphrase := getPassphrase(ctx)
+		passphrase := getPassphrase(ctx, false)
 		key, err := keystore.DecryptKey(keyjson, passphrase)
 		if err != nil {
 			utils.Fatalf("Error decrypting key: %v", err)
@@ -67,7 +67,7 @@ Change the password of a keyfile.`,
 			}
 			newPhrase = strings.TrimRight(string(content), "\r\n")
 		} else {
-			newPhrase = promptPassphrase(true)
+			newPhrase = utils.GetPassPhrase("", true)
 		}

 		// Encrypt the key with the new passphrase.
--- a/cmd/ethkey/generate.go
+++ b/cmd/ethkey/generate.go
@@ -52,6 +52,10 @@ If you want to encrypt an existing private key, it can be specified by setting
 			Name:  "privatekey",
 			Usage: "file containing a raw private key to encrypt",
 		},
+		cli.BoolFlag{
+			Name:  "lightkdf",
+			Usage: "use less secure scrypt parameters",
+		},
 	},
 	Action: func(ctx *cli.Context) error {
 		// Check if keyfile path given and make sure it doesn't already exist.
@@ -90,8 +94,12 @@ If you want to encrypt an existing private key, it can be specified by setting
 		}

 		// Encrypt key with passphrase.
-		passphrase := promptPassphrase(true)
-		keyjson, err := keystore.EncryptKey(key, passphrase, keystore.StandardScryptN, keystore.StandardScryptP)
+		passphrase := getPassphrase(ctx, true)
+		scryptN, scryptP := keystore.StandardScryptN, keystore.StandardScryptP
+		if ctx.Bool("lightkdf") {
+			scryptN, scryptP = keystore.LightScryptN, keystore.LightScryptP
+		}
+		keyjson, err := keystore.EncryptKey(key, passphrase, scryptN, scryptP)
 		if err != nil {
 			utils.Fatalf("Error encrypting key: %v", err)
 		}
--- a/cmd/ethkey/inspect.go
+++ b/cmd/ethkey/inspect.go
@@ -60,7 +60,7 @@ make sure to use this feature with great caution!`,
 		}

 		// Decrypt key with passphrase.
-		passphrase := getPassphrase(ctx)
+		passphrase := getPassphrase(ctx, false)
 		key, err := keystore.DecryptKey(keyjson, passphrase)
 		if err != nil {
 			utils.Fatalf("Error decrypting key: %v", err)
--- a/cmd/ethkey/main.go
+++ b/cmd/ethkey/main.go
@@ -20,7 +20,7 @@ import (
 	"fmt"
 	"os"

-	"github.com/ethereum/go-ethereum/cmd/utils"
+	"github.com/ethereum/go-ethereum/internal/flags"
 	"gopkg.in/urfave/cli.v1"
 )

@@ -35,7 +35,7 @@ var gitDate = ""
 var app *cli.App

 func init() {
-	app = utils.NewApp(gitCommit, gitDate, "an Ethereum key manager")
+	app = flags.NewApp(gitCommit, gitDate, "an Ethereum key manager")
 	app.Commands = []cli.Command{
 		commandGenerate,
 		commandInspect,
@@ -43,6 +43,7 @@ func init() {
 		commandSignMessage,
 		commandVerifyMessage,
 	}
+	cli.CommandHelpTemplate = flags.OriginCommandHelpTemplate
 }

 // Commonly used command line flags.
--- a/cmd/ethkey/message.go
+++ b/cmd/ethkey/message.go
@@ -62,7 +62,7 @@ To sign a message contained in a file, use the --msgfile flag.
 		}

 		// Decrypt key with passphrase.
-		passphrase := getPassphrase(ctx)
+		passphrase := getPassphrase(ctx, false)
 		key, err := keystore.DecryptKey(keyjson, passphrase)
 		if err != nil {
 			utils.Fatalf("Error decrypting key: %v", err)
--- a/cmd/ethkey/message_test.go
+++ b/cmd/ethkey/message_test.go
@@ -34,7 +34,7 @@ func TestMessageSignVerify(t *testing.T) {
 	message := "test message"

 	// Create the key.
-	generate := runEthkey(t, "generate", keyfile)
+	generate := runEthkey(t, "generate", "--lightkdf", keyfile)
 	generate.Expect(`
 !! Unsupported terminal, password will be echoed.
 Password: {{.InputLine "foobar"}}
--- a/cmd/ethkey/utils.go
+++ b/cmd/ethkey/utils.go
@@ -23,36 +23,14 @@ import (
 	"strings"

 	"github.com/ethereum/go-ethereum/cmd/utils"
-	"github.com/ethereum/go-ethereum/console"
 	"github.com/ethereum/go-ethereum/crypto"
 	"gopkg.in/urfave/cli.v1"
 )

-// promptPassphrase prompts the user for a passphrase.  Set confirmation to true
-// to require the user to confirm the passphrase.
-func promptPassphrase(confirmation bool) string {
-	passphrase, err := console.Stdin.PromptPassword("Password: ")
-	if err != nil {
-		utils.Fatalf("Failed to read password: %v", err)
-	}
-
-	if confirmation {
-		confirm, err := console.Stdin.PromptPassword("Repeat password: ")
-		if err != nil {
-			utils.Fatalf("Failed to read password confirmation: %v", err)
-		}
-		if passphrase != confirm {
-			utils.Fatalf("Passwords do not match")
-		}
-	}
-
-	return passphrase
-}
-
 // getPassphrase obtains a passphrase given by the user.  It first checks the
 // --passfile command line flag and ultimately prompts the user for a
 // passphrase.
-func getPassphrase(ctx *cli.Context) string {
+func getPassphrase(ctx *cli.Context, confirmation bool) string {
 	// Look for the --passwordfile flag.
 	passphraseFile := ctx.String(passphraseFlag.Name)
 	if passphraseFile != "" {
@@ -65,7 +43,7 @@ func getPassphrase(ctx *cli.Context) string {
 	}

 	// Otherwise prompt the user for the passphrase.
-	return promptPassphrase(false)
+	return utils.GetPassPhrase("", confirmation)
 }

 // signHash is a helper function that calculates a hash for the given message
--- a/cmd/evm/README.md
+++ b/cmd/evm/README.md
@@ -0,0 +1,268 @@
+## EVM state transition tool
+
+The `evm t8n` tool is a stateless state transition utility. It is a utility
+which can
+
+1. Take a prestate, including
+  - Accounts,
+  - Block context information,
+  - Previous blockshashes (*optional)
+2. Apply a set of transactions,
+3. Apply a mining-reward (*optional),
+4. And generate a post-state, including
+  - State root, transaction root, receipt root,
+  - Information about rejected transactions,
+  - Optionally: a full or partial post-state dump
+
+## Specification
+
+The idea is to specify the behaviour of this binary very _strict_, so that other
+node implementors can build replicas based on their own state-machines, and the
+state generators can swap between a `geth`-based implementation and a `parityvm`-based
+implementation.
+
+### Command line params
+
+Command line params that has to be supported are
+```
+
+   --trace                            Output full trace logs to files <txhash>.jsonl
+   --trace.nomemory                   Disable full memory dump in traces
+   --trace.nostack                    Disable stack output in traces
+   --output.alloc alloc               Determines where to put the alloc of the post-state.
+                                      `stdout` - into the stdout output
+                                      `stderr` - into the stderr output
+   --output.result result             Determines where to put the result (stateroot, txroot etc) of the post-state.
+                                      `stdout` - into the stdout output
+                                      `stderr` - into the stderr output
+   --state.fork value                 Name of ruleset to use.
+   --state.chainid value              ChainID to use (default: 1)
+   --state.reward value               Mining reward. Set to -1 to disable (default: 0)
+
+```
+
+### Error codes and output
+
+All logging should happen against the `stderr`.
+There are a few (not many) errors that can occur, those are defined below.
+
+#### EVM-based errors (`2` to `9`)
+
+- Other EVM error. Exit code `2`
+- Failed configuration: when a non-supported or invalid fork was specified. Exit code `3`.
+- Block history is not supplied, but needed for a `BLOCKHASH` operation. If `BLOCKHASH`
+  is invoked targeting a block which history has not been provided for, the program will
+  exit with code `4`.
+
+#### IO errors (`10`-`20`)
+
+- Invalid input json: the supplied data could not be marshalled.
+  The program will exit with code `10`
+- IO problems: failure to load or save files, the program will exit with code `11`
+
+## Examples
+### Basic usage
+
+Invoking it with the provided example files
+```
+./evm t8n --input.alloc=./testdata/1/alloc.json --input.txs=./testdata/1/txs.json --input.env=./testdata/1/env.json
+```
+Two resulting files:
+
+`alloc.json`:
+```json
+{
+ "0x8a8eafb1cf62bfbeb1741769dae1a9dd47996192": {
+  "balance": "0xfeed1a9d",
+  "nonce": "0x1"
+ },
+ "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b": {
+  "balance": "0x5ffd4878be161d74",
+  "nonce": "0xac"
+ },
+ "0xc94f5374fce5edbc8e2a8697c15331677e6ebf0b": {
+  "balance": "0xa410"
+ }
+}
+```
+`result.json`:
+```json
+{
+ "stateRoot": "0x84208a19bc2b46ada7445180c1db162be5b39b9abc8c0a54b05d32943eae4e13",
+ "txRoot": "0xc4761fd7b87ff2364c7c60b6c5c8d02e522e815328aaea3f20e3b7b7ef52c42d",
+ "receiptRoot": "0x056b23fbba480696b65fe5a59b8f2148a1299103c4f57df839233af2cf4ca2d2",
+ "logsHash": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+ "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+ "receipts": [
+  {
+   "root": "0x",
+   "status": "0x1",
+   "cumulativeGasUsed": "0x5208",
+   "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+   "logs": null,
+   "transactionHash": "0x0557bacce3375c98d806609b8d5043072f0b6a8bae45ae5a67a00d3a1a18d673",
+   "contractAddress": "0x0000000000000000000000000000000000000000",
+   "gasUsed": "0x5208",
+   "blockHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
+   "transactionIndex": "0x0"
+  }
+ ],
+ "rejected": [
+  1
+ ]
+}
+```
+
+We can make them spit out the data to e.g. `stdout` like this:
+```
+./evm t8n --input.alloc=./testdata/1/alloc.json --input.txs=./testdata/1/txs.json --input.env=./testdata/1/env.json --output.result=stdout --output.alloc=stdout
+```
+Output:
+```json
+{
+ "alloc": {
+  "0x8a8eafb1cf62bfbeb1741769dae1a9dd47996192": {
+   "balance": "0xfeed1a9d",
+   "nonce": "0x1"
+  },
+  "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b": {
+   "balance": "0x5ffd4878be161d74",
+   "nonce": "0xac"
+  },
+  "0xc94f5374fce5edbc8e2a8697c15331677e6ebf0b": {
+   "balance": "0xa410"
+  }
+ },
+ "result": {
+  "stateRoot": "0x84208a19bc2b46ada7445180c1db162be5b39b9abc8c0a54b05d32943eae4e13",
+  "txRoot": "0xc4761fd7b87ff2364c7c60b6c5c8d02e522e815328aaea3f20e3b7b7ef52c42d",
+  "receiptRoot": "0x056b23fbba480696b65fe5a59b8f2148a1299103c4f57df839233af2cf4ca2d2",
+  "logsHash": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+  "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+  "receipts": [
+   {
+    "root": "0x",
+    "status": "0x1",
+    "cumulativeGasUsed": "0x5208",
+    "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+    "logs": null,
+    "transactionHash": "0x0557bacce3375c98d806609b8d5043072f0b6a8bae45ae5a67a00d3a1a18d673",
+    "contractAddress": "0x0000000000000000000000000000000000000000",
+    "gasUsed": "0x5208",
+    "blockHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
+    "transactionIndex": "0x0"
+   }
+  ],
+  "rejected": [
+   1
+  ]
+ }
+}
+```
+
+## About Ommers
+
+Mining rewards and ommer rewards might need to be added. This is how those are applied:
+
+- `block_reward` is the block mining reward for the miner (`0xaa`), of a block at height `N`.
+- For each ommer (mined by `0xbb`), with blocknumber `N-delta`
+   - (where `delta` is the difference between the current block and the ommer)
+   - The account `0xbb` (ommer miner) is awarded `(8-delta)/ 8 * block_reward`
+   - The account `0xaa` (block miner) is awarded `block_reward / 32`
+
+To make `state_t8n` apply these, the following inputs are required:
+
+- `state.reward`
+  - For ethash, it is `5000000000000000000` `wei`,
+  - If this is not defined, mining rewards are not applied,
+  - A value of `0` is valid, and causes accounts to be 'touched'.
+- For each ommer, the tool needs to be given an `address` and a `delta`. This
+  is done via the `env`.
+
+Note: the tool does not verify that e.g. the normal uncle rules apply,
+and allows e.g two uncles at the same height, or the uncle-distance. This means that
+the tool allows for negative uncle reward (distance > 8)
+
+Example:
+`./testdata/5/env.json`:
+```json
+{
+  "currentCoinbase": "0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+  "currentDifficulty": "0x20000",
+  "currentGasLimit": "0x750a163df65e8a",
+  "currentNumber": "1",
+  "currentTimestamp": "1000",
+  "ommers": [
+    {"delta":  1, "address": "0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb" },
+    {"delta":  2, "address": "0xcccccccccccccccccccccccccccccccccccccccc" }
+  ]
+}
+```
+When applying this, using a reward of `0x08`
+Output:
+```json
+{
+ "alloc": {
+  "0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa": {
+   "balance": "0x88"
+  },
+  "0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb": {
+   "balance": "0x70"
+  },
+  "0xcccccccccccccccccccccccccccccccccccccccc": {
+   "balance": "0x60"
+  }
+ }
+}
+```
+### Future EIPS
+
+It is also possible to experiment with future eips that are not yet defined in a hard fork.
+Example, putting EIP-1344 into Frontier: 
+```
+./evm t8n --state.fork=Frontier+1344 --input.pre=./testdata/1/pre.json --input.txs=./testdata/1/txs.json --input.env=/testdata/1/env.json
+```
+
+### Block history
+
+The `BLOCKHASH` opcode requires blockhashes to be provided by the caller, inside the `env`.
+If a required blockhash is not provided, the exit code should be `4`:
+Example where blockhashes are provided: 
+```
+./evm t8n --input.alloc=./testdata/3/alloc.json --input.txs=./testdata/3/txs.json --input.env=./testdata/3/env.json --trace
+```
+```
+cat trace-0.jsonl | grep BLOCKHASH -C2
+```
+```
+{"pc":0,"op":96,"gas":"0x5f58ef8","gasCost":"0x3","memory":"0x","memSize":0,"stack":[],"returnStack":[],"depth":1,"refund":0,"opName":"PUSH1","error":""}
+{"pc":2,"op":64,"gas":"0x5f58ef5","gasCost":"0x14","memory":"0x","memSize":0,"stack":["0x1"],"returnStack":[],"depth":1,"refund":0,"opName":"BLOCKHASH","error":""}
+{"pc":3,"op":0,"gas":"0x5f58ee1","gasCost":"0x0","memory":"0x","memSize":0,"stack":["0xdac58aa524e50956d0c0bae7f3f8bb9d35381365d07804dd5b48a5a297c06af4"],"returnStack":[],"depth":1,"refund":0,"opName":"STOP","error":""}
+{"output":"","gasUsed":"0x17","time":155861}
+```
+
+In this example, the caller has not provided the required blockhash:
+```
+./evm t8n --input.alloc=./testdata/4/alloc.json --input.txs=./testdata/4/txs.json --input.env=./testdata/4/env.json --trace
+```
+```
+ERROR(4): getHash(3) invoked, blockhash for that block not provided
+```
+Error code: 4
+### Chaining
+
+Another thing that can be done, is to chain invocations:
+```
+./evm t8n --input.alloc=./testdata/1/alloc.json --input.txs=./testdata/1/txs.json --input.env=./testdata/1/env.json --output.alloc=stdout | ./evm t8n --input.alloc=stdin --input.env=./testdata/1/env.json --input.txs=./testdata/1/txs.json
+INFO [06-29|11:52:04.934] rejected tx                              index=1 hash="0557ba…18d673" from=0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192 error="nonce too low"
+INFO [06-29|11:52:04.936] rejected tx                              index=0 hash="0557ba…18d673" from=0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192 error="nonce too low"
+INFO [06-29|11:52:04.936] rejected tx                              index=1 hash="0557ba…18d673" from=0x8A8eAFb1cf62BfBeb1741769DAE1a9dd47996192 error="nonce too low"
+
+```
+What happened here, is that we first applied two identical transactions, so the second one was rejected. 
+Then, taking the poststate alloc as the input for the next state, we tried again to include
+the same two transactions: this time, both failed due to too low nonce.
+
+In order to meaningfully chain invocations, one would need to provide meaningful new `env`, otherwise the
+actual blocknumber (exposed to the EVM) would not increase.
+
--- a/cmd/evm/disasm.go
+++ b/cmd/evm/disasm.go
@@ -34,17 +34,22 @@ var disasmCommand = cli.Command{
 }

 func disasmCmd(ctx *cli.Context) error {
-	if len(ctx.Args().First()) == 0 {
-		return errors.New("filename required")
+	var in string
+	switch {
+	case len(ctx.Args().First()) > 0:
+		fn := ctx.Args().First()
+		input, err := ioutil.ReadFile(fn)
+		if err != nil {
+			return err
+		}
+		in = string(input)
+	case ctx.GlobalIsSet(InputFlag.Name):
+		in = ctx.GlobalString(InputFlag.Name)
+	default:
+		return errors.New("Missing filename or --input value")
 	}

-	fn := ctx.Args().First()
-	in, err := ioutil.ReadFile(fn)
-	if err != nil {
-		return err
-	}
-
-	code := strings.TrimSpace(string(in))
+	code := strings.TrimSpace(in)
 	fmt.Printf("%v\n", code)
 	return asm.PrintDisassembled(code)
 }
--- a/cmd/evm/internal/t8ntool/execution.go
+++ b/cmd/evm/internal/t8ntool/execution.go
@@ -0,0 +1,255 @@
+// Copyright 2020 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package t8ntool
+
+import (
+	"fmt"
+	"math/big"
+	"os"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/math"
+	"github.com/ethereum/go-ethereum/consensus/misc"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/rawdb"
+	"github.com/ethereum/go-ethereum/core/state"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/core/vm"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/rlp"
+	"golang.org/x/crypto/sha3"
+)
+
+type Prestate struct {
+	Env stEnv             `json:"env"`
+	Pre core.GenesisAlloc `json:"pre"`
+}
+
+// ExecutionResult contains the execution status after running a state test, any
+// error that might have occurred and a dump of the final state if requested.
+type ExecutionResult struct {
+	StateRoot   common.Hash    `json:"stateRoot"`
+	TxRoot      common.Hash    `json:"txRoot"`
+	ReceiptRoot common.Hash    `json:"receiptRoot"`
+	LogsHash    common.Hash    `json:"logsHash"`
+	Bloom       types.Bloom    `json:"logsBloom"        gencodec:"required"`
+	Receipts    types.Receipts `json:"receipts"`
+	Rejected    []int          `json:"rejected,omitempty"`
+}
+
+type ommer struct {
+	Delta   uint64         `json:"delta"`
+	Address common.Address `json:"address"`
+}
+
+//go:generate gencodec -type stEnv -field-override stEnvMarshaling -out gen_stenv.go
+type stEnv struct {
+	Coinbase    common.Address                      `json:"currentCoinbase"   gencodec:"required"`
+	Difficulty  *big.Int                            `json:"currentDifficulty" gencodec:"required"`
+	GasLimit    uint64                              `json:"currentGasLimit"   gencodec:"required"`
+	Number      uint64                              `json:"currentNumber"     gencodec:"required"`
+	Timestamp   uint64                              `json:"currentTimestamp"  gencodec:"required"`
+	BlockHashes map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
+	Ommers      []ommer                             `json:"ommers,omitempty"`
+}
+
+type stEnvMarshaling struct {
+	Coinbase   common.UnprefixedAddress
+	Difficulty *math.HexOrDecimal256
+	GasLimit   math.HexOrDecimal64
+	Number     math.HexOrDecimal64
+	Timestamp  math.HexOrDecimal64
+}
+
+// Apply applies a set of transactions to a pre-state
+func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
+	txs types.Transactions, miningReward int64,
+	getTracerFn func(txIndex int) (tracer vm.Tracer, err error)) (*state.StateDB, *ExecutionResult, error) {
+
+	// Capture errors for BLOCKHASH operation, if we haven't been supplied the
+	// required blockhashes
+	var hashError error
+	getHash := func(num uint64) common.Hash {
+		if pre.Env.BlockHashes == nil {
+			hashError = fmt.Errorf("getHash(%d) invoked, no blockhashes provided", num)
+			return common.Hash{}
+		}
+		h, ok := pre.Env.BlockHashes[math.HexOrDecimal64(num)]
+		if !ok {
+			hashError = fmt.Errorf("getHash(%d) invoked, blockhash for that block not provided", num)
+		}
+		return h
+	}
+	var (
+		statedb     = MakePreState(rawdb.NewMemoryDatabase(), pre.Pre)
+		signer      = types.MakeSigner(chainConfig, new(big.Int).SetUint64(pre.Env.Number))
+		gaspool     = new(core.GasPool)
+		blockHash   = common.Hash{0x13, 0x37}
+		rejectedTxs []int
+		includedTxs types.Transactions
+		gasUsed     = uint64(0)
+		receipts    = make(types.Receipts, 0)
+		txIndex     = 0
+	)
+	gaspool.AddGas(pre.Env.GasLimit)
+	vmContext := vm.Context{
+		CanTransfer: core.CanTransfer,
+		Transfer:    core.Transfer,
+		Coinbase:    pre.Env.Coinbase,
+		BlockNumber: new(big.Int).SetUint64(pre.Env.Number),
+		Time:        new(big.Int).SetUint64(pre.Env.Timestamp),
+		Difficulty:  pre.Env.Difficulty,
+		GasLimit:    pre.Env.GasLimit,
+		GetHash:     getHash,
+		// GasPrice and Origin needs to be set per transaction
+	}
+	// If DAO is supported/enabled, we need to handle it here. In geth 'proper', it's
+	// done in StateProcessor.Process(block, ...), right before transactions are applied.
+	if chainConfig.DAOForkSupport &&
+		chainConfig.DAOForkBlock != nil &&
+		chainConfig.DAOForkBlock.Cmp(new(big.Int).SetUint64(pre.Env.Number)) == 0 {
+		misc.ApplyDAOHardFork(statedb)
+	}
+
+	for i, tx := range txs {
+		msg, err := tx.AsMessage(signer)
+		if err != nil {
+			log.Info("rejected tx", "index", i, "hash", tx.Hash(), "error", err)
+			rejectedTxs = append(rejectedTxs, i)
+			continue
+		}
+		tracer, err := getTracerFn(txIndex)
+		if err != nil {
+			return nil, nil, err
+		}
+		vmConfig.Tracer = tracer
+		vmConfig.Debug = (tracer != nil)
+		statedb.Prepare(tx.Hash(), blockHash, txIndex)
+		vmContext.GasPrice = msg.GasPrice()
+		vmContext.Origin = msg.From()
+
+		evm := vm.NewEVM(vmContext, statedb, chainConfig, vmConfig)
+		snapshot := statedb.Snapshot()
+		// (ret []byte, usedGas uint64, failed bool, err error)
+		msgResult, err := core.ApplyMessage(evm, msg, gaspool)
+		if err != nil {
+			statedb.RevertToSnapshot(snapshot)
+			log.Info("rejected tx", "index", i, "hash", tx.Hash(), "from", msg.From(), "error", err)
+			rejectedTxs = append(rejectedTxs, i)
+			continue
+		}
+		includedTxs = append(includedTxs, tx)
+		if hashError != nil {
+			return nil, nil, NewError(ErrorMissingBlockhash, hashError)
+		}
+		gasUsed += msgResult.UsedGas
+		// Create a new receipt for the transaction, storing the intermediate root and gas used by the tx
+		{
+			var root []byte
+			if chainConfig.IsByzantium(vmContext.BlockNumber) {
+				statedb.Finalise(true)
+			} else {
+				root = statedb.IntermediateRoot(chainConfig.IsEIP158(vmContext.BlockNumber)).Bytes()
+			}
+
+			receipt := types.NewReceipt(root, msgResult.Failed(), gasUsed)
+			receipt.TxHash = tx.Hash()
+			receipt.GasUsed = msgResult.UsedGas
+			// if the transaction created a contract, store the creation address in the receipt.
+			if msg.To() == nil {
+				receipt.ContractAddress = crypto.CreateAddress(evm.Context.Origin, tx.Nonce())
+			}
+			// Set the receipt logs and create a bloom for filtering
+			receipt.Logs = statedb.GetLogs(tx.Hash())
+			receipt.Bloom = types.CreateBloom(types.Receipts{receipt})
+			// These three are non-consensus fields
+			//receipt.BlockHash
+			//receipt.BlockNumber =
+			receipt.TransactionIndex = uint(txIndex)
+			receipts = append(receipts, receipt)
+		}
+		txIndex++
+	}
+	statedb.IntermediateRoot(chainConfig.IsEIP158(vmContext.BlockNumber))
+	// Add mining reward?
+	if miningReward > 0 {
+		// Add mining reward. The mining reward may be `0`, which only makes a difference in the cases
+		// where
+		// - the coinbase suicided, or
+		// - there are only 'bad' transactions, which aren't executed. In those cases,
+		//   the coinbase gets no txfee, so isn't created, and thus needs to be touched
+		var (
+			blockReward = big.NewInt(miningReward)
+			minerReward = new(big.Int).Set(blockReward)
+			perOmmer    = new(big.Int).Div(blockReward, big.NewInt(32))
+		)
+		for _, ommer := range pre.Env.Ommers {
+			// Add 1/32th for each ommer included
+			minerReward.Add(minerReward, perOmmer)
+			// Add (8-delta)/8
+			reward := big.NewInt(8)
+			reward.Sub(reward, big.NewInt(0).SetUint64(ommer.Delta))
+			reward.Mul(reward, blockReward)
+			reward.Div(reward, big.NewInt(8))
+			statedb.AddBalance(ommer.Address, reward)
+		}
+		statedb.AddBalance(pre.Env.Coinbase, minerReward)
+	}
+	// Commit block
+	root, err := statedb.Commit(chainConfig.IsEIP158(vmContext.BlockNumber))
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Could not commit state: %v", err)
+		return nil, nil, NewError(ErrorEVM, fmt.Errorf("could not commit state: %v", err))
+	}
+	execRs := &ExecutionResult{
+		StateRoot:   root,
+		TxRoot:      types.DeriveSha(includedTxs),
+		ReceiptRoot: types.DeriveSha(receipts),
+		Bloom:       types.CreateBloom(receipts),
+		LogsHash:    rlpHash(statedb.Logs()),
+		Receipts:    receipts,
+		Rejected:    rejectedTxs,
+	}
+	return statedb, execRs, nil
+}
+
+func MakePreState(db ethdb.Database, accounts core.GenesisAlloc) *state.StateDB {
+	sdb := state.NewDatabase(db)
+	statedb, _ := state.New(common.Hash{}, sdb, nil)
+	for addr, a := range accounts {
+		statedb.SetCode(addr, a.Code)
+		statedb.SetNonce(addr, a.Nonce)
+		statedb.SetBalance(addr, a.Balance)
+		for k, v := range a.Storage {
+			statedb.SetState(addr, k, v)
+		}
+	}
+	// Commit and re-open to start with a clean state.
+	root, _ := statedb.Commit(false)
+	statedb, _ = state.New(root, sdb, nil)
+	return statedb
+}
+
+func rlpHash(x interface{}) (h common.Hash) {
+	hw := sha3.NewLegacyKeccak256()
+	rlp.Encode(hw, x)
+	hw.Sum(h[:0])
+	return h
+}
--- a/cmd/evm/internal/t8ntool/flags.go
+++ b/cmd/evm/internal/t8ntool/flags.go
@@ -0,0 +1,103 @@
+// Copyright 2020 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package t8ntool
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/core/vm"
+	"github.com/ethereum/go-ethereum/tests"
+	"gopkg.in/urfave/cli.v1"
+)
+
+var (
+	TraceFlag = cli.BoolFlag{
+		Name:  "trace",
+		Usage: "Output full trace logs to files <txhash>.jsonl",
+	}
+	TraceDisableMemoryFlag = cli.BoolFlag{
+		Name:  "trace.nomemory",
+		Usage: "Disable full memory dump in traces",
+	}
+	TraceDisableStackFlag = cli.BoolFlag{
+		Name:  "trace.nostack",
+		Usage: "Disable stack output in traces",
+	}
+	TraceDisableReturnDataFlag = cli.BoolFlag{
+		Name:  "trace.noreturndata",
+		Usage: "Disable return data output in traces",
+	}
+	OutputAllocFlag = cli.StringFlag{
+		Name: "output.alloc",
+		Usage: "Determines where to put the `alloc` of the post-state.\n" +
+			"\t`stdout` - into the stdout output\n" +
+			"\t`stderr` - into the stderr output\n" +
+			"\t<file> - into the file <file> ",
+		Value: "alloc.json",
+	}
+	OutputResultFlag = cli.StringFlag{
+		Name: "output.result",
+		Usage: "Determines where to put the `result` (stateroot, txroot etc) of the post-state.\n" +
+			"\t`stdout` - into the stdout output\n" +
+			"\t`stderr` - into the stderr output\n" +
+			"\t<file> - into the file <file> ",
+		Value: "result.json",
+	}
+	InputAllocFlag = cli.StringFlag{
+		Name:  "input.alloc",
+		Usage: "`stdin` or file name of where to find the prestate alloc to use.",
+		Value: "alloc.json",
+	}
+	InputEnvFlag = cli.StringFlag{
+		Name:  "input.env",
+		Usage: "`stdin` or file name of where to find the prestate env to use.",
+		Value: "env.json",
+	}
+	InputTxsFlag = cli.StringFlag{
+		Name:  "input.txs",
+		Usage: "`stdin` or file name of where to find the transactions to apply.",
+		Value: "txs.json",
+	}
+	RewardFlag = cli.Int64Flag{
+		Name:  "state.reward",
+		Usage: "Mining reward. Set to -1 to disable",
+		Value: 0,
+	}
+	ChainIDFlag = cli.Int64Flag{
+		Name:  "state.chainid",
+		Usage: "ChainID to use",
+		Value: 1,
+	}
+	ForknameFlag = cli.StringFlag{
+		Name: "state.fork",
+		Usage: fmt.Sprintf("Name of ruleset to use."+
+			"\n\tAvailable forknames:"+
+			"\n\t    %v"+
+			"\n\tAvailable extra eips:"+
+			"\n\t    %v"+
+			"\n\tSyntax <forkname>(+ExtraEip)",
+			strings.Join(tests.AvailableForks(), "\n\t    "),
+			strings.Join(vm.ActivateableEips(), ", ")),
+		Value: "Istanbul",
+	}
+	VerbosityFlag = cli.IntFlag{
+		Name:  "verbosity",
+		Usage: "sets the verbosity level",
+		Value: 3,
+	}
+)
--- a/cmd/evm/internal/t8ntool/gen_stenv.go
+++ b/cmd/evm/internal/t8ntool/gen_stenv.go
@@ -0,0 +1,80 @@
+// Code generated by github.com/fjl/gencodec. DO NOT EDIT.
+
+package t8ntool
+
+import (
+	"encoding/json"
+	"errors"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/math"
+)
+
+var _ = (*stEnvMarshaling)(nil)
+
+// MarshalJSON marshals as JSON.
+func (s stEnv) MarshalJSON() ([]byte, error) {
+	type stEnv struct {
+		Coinbase    common.UnprefixedAddress            `json:"currentCoinbase"   gencodec:"required"`
+		Difficulty  *math.HexOrDecimal256               `json:"currentDifficulty" gencodec:"required"`
+		GasLimit    math.HexOrDecimal64                 `json:"currentGasLimit"   gencodec:"required"`
+		Number      math.HexOrDecimal64                 `json:"currentNumber"     gencodec:"required"`
+		Timestamp   math.HexOrDecimal64                 `json:"currentTimestamp"  gencodec:"required"`
+		BlockHashes map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
+		Ommers      []ommer                             `json:"ommers,omitempty"`
+	}
+	var enc stEnv
+	enc.Coinbase = common.UnprefixedAddress(s.Coinbase)
+	enc.Difficulty = (*math.HexOrDecimal256)(s.Difficulty)
+	enc.GasLimit = math.HexOrDecimal64(s.GasLimit)
+	enc.Number = math.HexOrDecimal64(s.Number)
+	enc.Timestamp = math.HexOrDecimal64(s.Timestamp)
+	enc.BlockHashes = s.BlockHashes
+	enc.Ommers = s.Ommers
+	return json.Marshal(&enc)
+}
+
+// UnmarshalJSON unmarshals from JSON.
+func (s *stEnv) UnmarshalJSON(input []byte) error {
+	type stEnv struct {
+		Coinbase    *common.UnprefixedAddress           `json:"currentCoinbase"   gencodec:"required"`
+		Difficulty  *math.HexOrDecimal256               `json:"currentDifficulty" gencodec:"required"`
+		GasLimit    *math.HexOrDecimal64                `json:"currentGasLimit"   gencodec:"required"`
+		Number      *math.HexOrDecimal64                `json:"currentNumber"     gencodec:"required"`
+		Timestamp   *math.HexOrDecimal64                `json:"currentTimestamp"  gencodec:"required"`
+		BlockHashes map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
+		Ommers      []ommer                             `json:"ommers,omitempty"`
+	}
+	var dec stEnv
+	if err := json.Unmarshal(input, &dec); err != nil {
+		return err
+	}
+	if dec.Coinbase == nil {
+		return errors.New("missing required field 'currentCoinbase' for stEnv")
+	}
+	s.Coinbase = common.Address(*dec.Coinbase)
+	if dec.Difficulty == nil {
+		return errors.New("missing required field 'currentDifficulty' for stEnv")
+	}
+	s.Difficulty = (*big.Int)(dec.Difficulty)
+	if dec.GasLimit == nil {
+		return errors.New("missing required field 'currentGasLimit' for stEnv")
+	}
+	s.GasLimit = uint64(*dec.GasLimit)
+	if dec.Number == nil {
+		return errors.New("missing required field 'currentNumber' for stEnv")
+	}
+	s.Number = uint64(*dec.Number)
+	if dec.Timestamp == nil {
+		return errors.New("missing required field 'currentTimestamp' for stEnv")
+	}
+	s.Timestamp = uint64(*dec.Timestamp)
+	if dec.BlockHashes != nil {
+		s.BlockHashes = dec.BlockHashes
+	}
+	if dec.Ommers != nil {
+		s.Ommers = dec.Ommers
+	}
+	return nil
+}
--- a/cmd/evm/internal/t8ntool/transition.go
+++ b/cmd/evm/internal/t8ntool/transition.go
@@ -0,0 +1,277 @@
+// Copyright 2020 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package t8ntool
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"math/big"
+	"os"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/state"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/core/vm"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/tests"
+	"gopkg.in/urfave/cli.v1"
+)
+
+const (
+	ErrorEVM              = 2
+	ErrorVMConfig         = 3
+	ErrorMissingBlockhash = 4
+
+	ErrorJson = 10
+	ErrorIO   = 11
+
+	stdinSelector = "stdin"
+)
+
+type NumberedError struct {
+	errorCode int
+	err       error
+}
+
+func NewError(errorCode int, err error) *NumberedError {
+	return &NumberedError{errorCode, err}
+}
+
+func (n *NumberedError) Error() string {
+	return fmt.Sprintf("ERROR(%d): %v", n.errorCode, n.err.Error())
+}
+
+func (n *NumberedError) Code() int {
+	return n.errorCode
+}
+
+type input struct {
+	Alloc core.GenesisAlloc  `json:"alloc,omitempty"`
+	Env   *stEnv             `json:"env,omitempty"`
+	Txs   types.Transactions `json:"txs,omitempty"`
+}
+
+func Main(ctx *cli.Context) error {
+	// Configure the go-ethereum logger
+	glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
+	glogger.Verbosity(log.Lvl(ctx.Int(VerbosityFlag.Name)))
+	log.Root().SetHandler(glogger)
+
+	var (
+		err    error
+		tracer vm.Tracer
+	)
+	var getTracer func(txIndex int) (vm.Tracer, error)
+
+	if ctx.Bool(TraceFlag.Name) {
+		// Configure the EVM logger
+		logConfig := &vm.LogConfig{
+			DisableStack:      ctx.Bool(TraceDisableStackFlag.Name),
+			DisableMemory:     ctx.Bool(TraceDisableMemoryFlag.Name),
+			DisableReturnData: ctx.Bool(TraceDisableReturnDataFlag.Name),
+			Debug:             true,
+		}
+		var prevFile *os.File
+		// This one closes the last file
+		defer func() {
+			if prevFile != nil {
+				prevFile.Close()
+			}
+		}()
+		getTracer = func(txIndex int) (vm.Tracer, error) {
+			if prevFile != nil {
+				prevFile.Close()
+			}
+			traceFile, err := os.Create(fmt.Sprintf("trace-%d.jsonl", txIndex))
+			if err != nil {
+				return nil, NewError(ErrorIO, fmt.Errorf("failed creating trace-file: %v", err))
+			}
+			prevFile = traceFile
+			return vm.NewJSONLogger(logConfig, traceFile), nil
+		}
+	} else {
+		getTracer = func(txIndex int) (tracer vm.Tracer, err error) {
+			return nil, nil
+		}
+	}
+	// We need to load three things: alloc, env and transactions. May be either in
+	// stdin input or in files.
+	// Check if anything needs to be read from stdin
+	var (
+		prestate Prestate
+		txs      types.Transactions // txs to apply
+		allocStr = ctx.String(InputAllocFlag.Name)
+
+		envStr    = ctx.String(InputEnvFlag.Name)
+		txStr     = ctx.String(InputTxsFlag.Name)
+		inputData = &input{}
+	)
+
+	if allocStr == stdinSelector || envStr == stdinSelector || txStr == stdinSelector {
+		decoder := json.NewDecoder(os.Stdin)
+		decoder.Decode(inputData)
+	}
+	if allocStr != stdinSelector {
+		inFile, err := os.Open(allocStr)
+		if err != nil {
+			return NewError(ErrorIO, fmt.Errorf("failed reading alloc file: %v", err))
+		}
+		defer inFile.Close()
+		decoder := json.NewDecoder(inFile)
+		if err := decoder.Decode(&inputData.Alloc); err != nil {
+			return NewError(ErrorJson, fmt.Errorf("Failed unmarshaling alloc-file: %v", err))
+		}
+	}
+
+	if envStr != stdinSelector {
+		inFile, err := os.Open(envStr)
+		if err != nil {
+			return NewError(ErrorIO, fmt.Errorf("failed reading env file: %v", err))
+		}
+		defer inFile.Close()
+		decoder := json.NewDecoder(inFile)
+		var env stEnv
+		if err := decoder.Decode(&env); err != nil {
+			return NewError(ErrorJson, fmt.Errorf("Failed unmarshaling env-file: %v", err))
+		}
+		inputData.Env = &env
+	}
+
+	if txStr != stdinSelector {
+		inFile, err := os.Open(txStr)
+		if err != nil {
+			return NewError(ErrorIO, fmt.Errorf("failed reading txs file: %v", err))
+		}
+		defer inFile.Close()
+		decoder := json.NewDecoder(inFile)
+		var txs types.Transactions
+		if err := decoder.Decode(&txs); err != nil {
+			return NewError(ErrorJson, fmt.Errorf("Failed unmarshaling txs-file: %v", err))
+		}
+		inputData.Txs = txs
+	}
+
+	prestate.Pre = inputData.Alloc
+	prestate.Env = *inputData.Env
+	txs = inputData.Txs
+
+	// Iterate over all the tests, run them and aggregate the results
+	vmConfig := vm.Config{
+		Tracer: tracer,
+		Debug:  (tracer != nil),
+	}
+	// Construct the chainconfig
+	var chainConfig *params.ChainConfig
+	if cConf, extraEips, err := tests.GetChainConfig(ctx.String(ForknameFlag.Name)); err != nil {
+		return NewError(ErrorVMConfig, fmt.Errorf("Failed constructing chain configuration: %v", err))
+	} else {
+		chainConfig = cConf
+		vmConfig.ExtraEips = extraEips
+	}
+	// Set the chain id
+	chainConfig.ChainID = big.NewInt(ctx.Int64(ChainIDFlag.Name))
+
+	// Run the test and aggregate the result
+	state, result, err := prestate.Apply(vmConfig, chainConfig, txs, ctx.Int64(RewardFlag.Name), getTracer)
+	if err != nil {
+		return err
+	}
+	// Dump the excution result
+	//postAlloc := state.DumpGenesisFormat(false, false, false)
+	collector := make(Alloc)
+	state.DumpToCollector(collector, false, false, false, nil, -1)
+	return dispatchOutput(ctx, result, collector)
+
+}
+
+type Alloc map[common.Address]core.GenesisAccount
+
+func (g Alloc) OnRoot(common.Hash) {}
+
+func (g Alloc) OnAccount(addr common.Address, dumpAccount state.DumpAccount) {
+	balance, _ := new(big.Int).SetString(dumpAccount.Balance, 10)
+	var storage map[common.Hash]common.Hash
+	if dumpAccount.Storage != nil {
+		storage = make(map[common.Hash]common.Hash)
+		for k, v := range dumpAccount.Storage {
+			storage[k] = common.HexToHash(v)
+		}
+	}
+	genesisAccount := core.GenesisAccount{
+		Code:    common.FromHex(dumpAccount.Code),
+		Storage: storage,
+		Balance: balance,
+		Nonce:   dumpAccount.Nonce,
+	}
+	g[addr] = genesisAccount
+}
+
+// saveFile marshalls the object to the given file
+func saveFile(filename string, data interface{}) error {
+	b, err := json.MarshalIndent(data, "", " ")
+	if err != nil {
+		return NewError(ErrorJson, fmt.Errorf("failed marshalling output: %v", err))
+	}
+	if err = ioutil.WriteFile(filename, b, 0644); err != nil {
+		return NewError(ErrorIO, fmt.Errorf("failed writing output: %v", err))
+	}
+	return nil
+}
+
+// dispatchOutput writes the output data to either stderr or stdout, or to the specified
+// files
+func dispatchOutput(ctx *cli.Context, result *ExecutionResult, alloc Alloc) error {
+	stdOutObject := make(map[string]interface{})
+	stdErrObject := make(map[string]interface{})
+	dispatch := func(fName, name string, obj interface{}) error {
+		switch fName {
+		case "stdout":
+			stdOutObject[name] = obj
+		case "stderr":
+			stdErrObject[name] = obj
+		default: // save to file
+			if err := saveFile(fName, obj); err != nil {
+				return err
+			}
+		}
+		return nil
+	}
+	if err := dispatch(ctx.String(OutputAllocFlag.Name), "alloc", alloc); err != nil {
+		return err
+	}
+	if err := dispatch(ctx.String(OutputResultFlag.Name), "result", result); err != nil {
+		return err
+	}
+	if len(stdOutObject) > 0 {
+		b, err := json.MarshalIndent(stdOutObject, "", " ")
+		if err != nil {
+			return NewError(ErrorJson, fmt.Errorf("failed marshalling output: %v", err))
+		}
+		os.Stdout.Write(b)
+	}
+	if len(stdErrObject) > 0 {
+		b, err := json.MarshalIndent(stdErrObject, "", " ")
+		if err != nil {
+			return NewError(ErrorJson, fmt.Errorf("failed marshalling output: %v", err))
+		}
+		os.Stderr.Write(b)
+	}
+	return nil
+}
--- a/cmd/evm/main.go
+++ b/cmd/evm/main.go
@@ -22,7 +22,9 @@ import (
 	"math/big"
 	"os"

+	"github.com/ethereum/go-ethereum/cmd/evm/internal/t8ntool"
 	"github.com/ethereum/go-ethereum/cmd/utils"
+	"github.com/ethereum/go-ethereum/internal/flags"
 	"gopkg.in/urfave/cli.v1"
 )

@@ -30,7 +32,7 @@ var gitCommit = "" // Git SHA1 commit hash of the release (set via linker flags)
 var gitDate = ""

 var (
-	app = utils.NewApp(gitCommit, gitDate, "the evm command line interface")
+	app = flags.NewApp(gitCommit, gitDate, "the evm command line interface")

 	DebugFlag = cli.BoolFlag{
 		Name:  "debug",
@@ -87,6 +89,10 @@ var (
 		Name:  "verbosity",
 		Usage: "sets the verbosity level",
 	}
+	BenchFlag = cli.BoolFlag{
+		Name:  "bench",
+		Usage: "benchmark the execution",
+	}
 	CreateFlag = cli.BoolFlag{
 		Name:  "create",
 		Usage: "indicates the action should be create rather than call",
@@ -115,6 +121,14 @@ var (
 		Name:  "nostack",
 		Usage: "disable stack output",
 	}
+	DisableStorageFlag = cli.BoolFlag{
+		Name:  "nostorage",
+		Usage: "disable storage output",
+	}
+	DisableReturnDataFlag = cli.BoolFlag{
+		Name:  "noreturndata",
+		Usage: "disable return data output",
+	}
 	EVMInterpreterFlag = cli.StringFlag{
 		Name:  "vm.evm",
 		Usage: "External EVM configuration (default = built-in interpreter)",
@@ -122,8 +136,31 @@ var (
 	}
 )

+var stateTransitionCommand = cli.Command{
+	Name:    "transition",
+	Aliases: []string{"t8n"},
+	Usage:   "executes a full state transition",
+	Action:  t8ntool.Main,
+	Flags: []cli.Flag{
+		t8ntool.TraceFlag,
+		t8ntool.TraceDisableMemoryFlag,
+		t8ntool.TraceDisableStackFlag,
+		t8ntool.TraceDisableReturnDataFlag,
+		t8ntool.OutputAllocFlag,
+		t8ntool.OutputResultFlag,
+		t8ntool.InputAllocFlag,
+		t8ntool.InputEnvFlag,
+		t8ntool.InputTxsFlag,
+		t8ntool.ForknameFlag,
+		t8ntool.ChainIDFlag,
+		t8ntool.RewardFlag,
+		t8ntool.VerbosityFlag,
+	},
+}
+
 func init() {
 	app.Flags = []cli.Flag{
+		BenchFlag,
 		CreateFlag,
 		DebugFlag,
 		VerbosityFlag,
@@ -144,6 +181,8 @@ func init() {
 		ReceiverFlag,
 		DisableMemoryFlag,
 		DisableStackFlag,
+		DisableStorageFlag,
+		DisableReturnDataFlag,
 		EVMInterpreterFlag,
 	}
 	app.Commands = []cli.Command{
@@ -151,12 +190,18 @@ func init() {
 		disasmCommand,
 		runCommand,
 		stateTestCommand,
+		stateTransitionCommand,
 	}
+	cli.CommandHelpTemplate = flags.OriginCommandHelpTemplate
 }

 func main() {
 	if err := app.Run(os.Args); err != nil {
+		code := 1
+		if ec, ok := err.(*t8ntool.NumberedError); ok {
+			code = ec.Code()
+		}
 		fmt.Fprintln(os.Stderr, err)
-		os.Exit(1)
+		os.Exit(code)
 	}
 }
--- a/cmd/evm/poststate.json
+++ b/cmd/evm/poststate.json
@@ -0,0 +1,23 @@
+{
+    "root": "f4157bb27bcb1d1a63001434a249a80948f2e9fe1f53d551244c1dae826b5b23",
+    "accounts": {
+        "0x8a8eafb1cf62bfbeb1741769dae1a9dd47996192": {
+            "balance": "4276951709",
+            "nonce": 1,
+            "root": "56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "codeHash": "c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"
+        },
+        "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b": {
+            "balance": "6916764286133345652",
+            "nonce": 172,
+            "root": "56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "codeHash": "c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"
+        },
+        "0xc94f5374fce5edbc8e2a8697c15331677e6ebf0b": {
+            "balance": "42500",
+            "nonce": 0,
+            "root": "56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+            "codeHash": "c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"
+        }
+    }
+}
--- a/cmd/evm/runner.go
+++ b/cmd/evm/runner.go
@@ -25,6 +25,7 @@ import (
 	"os"
 	goruntime "runtime"
 	"runtime/pprof"
+	"testing"
 	"time"

 	"github.com/ethereum/go-ethereum/cmd/evm/internal/compiler"
@@ -69,14 +70,49 @@ func readGenesis(genesisPath string) *core.Genesis {
 	return genesis
 }

+type execStats struct {
+	time           time.Duration // The execution time.
+	allocs         int64         // The number of heap allocations during execution.
+	bytesAllocated int64         // The cumulative number of bytes allocated during execution.
+}
+
+func timedExec(bench bool, execFunc func() ([]byte, uint64, error)) (output []byte, gasLeft uint64, stats execStats, err error) {
+	if bench {
+		result := testing.Benchmark(func(b *testing.B) {
+			for i := 0; i < b.N; i++ {
+				output, gasLeft, err = execFunc()
+			}
+		})
+
+		// Get the average execution time from the benchmarking result.
+		// There are other useful stats here that could be reported.
+		stats.time = time.Duration(result.NsPerOp())
+		stats.allocs = result.AllocsPerOp()
+		stats.bytesAllocated = result.AllocedBytesPerOp()
+	} else {
+		var memStatsBefore, memStatsAfter goruntime.MemStats
+		goruntime.ReadMemStats(&memStatsBefore)
+		startTime := time.Now()
+		output, gasLeft, err = execFunc()
+		stats.time = time.Since(startTime)
+		goruntime.ReadMemStats(&memStatsAfter)
+		stats.allocs = int64(memStatsAfter.Mallocs - memStatsBefore.Mallocs)
+		stats.bytesAllocated = int64(memStatsAfter.TotalAlloc - memStatsBefore.TotalAlloc)
+	}
+
+	return output, gasLeft, stats, err
+}
+
 func runCmd(ctx *cli.Context) error {
 	glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
 	glogger.Verbosity(log.Lvl(ctx.GlobalInt(VerbosityFlag.Name)))
 	log.Root().SetHandler(glogger)
 	logconfig := &vm.LogConfig{
-		DisableMemory: ctx.GlobalBool(DisableMemoryFlag.Name),
-		DisableStack:  ctx.GlobalBool(DisableStackFlag.Name),
-		Debug:         ctx.GlobalBool(DebugFlag.Name),
+		DisableMemory:     ctx.GlobalBool(DisableMemoryFlag.Name),
+		DisableStack:      ctx.GlobalBool(DisableStackFlag.Name),
+		DisableStorage:    ctx.GlobalBool(DisableStorageFlag.Name),
+		DisableReturnData: ctx.GlobalBool(DisableReturnDataFlag.Name),
+		Debug:             ctx.GlobalBool(DebugFlag.Name),
 	}

 	var (
@@ -101,10 +137,10 @@ func runCmd(ctx *cli.Context) error {
 		genesisConfig = gen
 		db := rawdb.NewMemoryDatabase()
 		genesis := gen.ToBlock(db)
-		statedb, _ = state.New(genesis.Root(), state.NewDatabase(db))
+		statedb, _ = state.New(genesis.Root(), state.NewDatabase(db), nil)
 		chainConfig = gen.Config
 	} else {
-		statedb, _ = state.New(common.Hash{}, state.NewDatabase(rawdb.NewMemoryDatabase()))
+		statedb, _ = state.New(common.Hash{}, state.NewDatabase(rawdb.NewMemoryDatabase()), nil)
 		genesisConfig = new(core.Genesis)
 	}
 	if ctx.GlobalString(SenderFlag.Name) != "" {
@@ -116,11 +152,7 @@ func runCmd(ctx *cli.Context) error {
 		receiver = common.HexToAddress(ctx.GlobalString(ReceiverFlag.Name))
 	}

-	var (
-		code []byte
-		ret  []byte
-		err  error
-	)
+	var code []byte
 	codeFileFlag := ctx.GlobalString(CodeFileFlag.Name)
 	codeFlag := ctx.GlobalString(CodeFlag.Name)

@@ -203,10 +235,10 @@ func runCmd(ctx *cli.Context) error {
 	} else {
 		runtimeConfig.ChainConfig = params.AllEthashProtocolChanges
 	}
-	tstart := time.Now()
-	var leftOverGas uint64
+
 	var hexInput []byte
 	if inputFileFlag := ctx.GlobalString(InputFileFlag.Name); inputFileFlag != "" {
+		var err error
 		if hexInput, err = ioutil.ReadFile(inputFileFlag); err != nil {
 			fmt.Printf("could not load input from file: %v\n", err)
 			os.Exit(1)
@@ -215,16 +247,25 @@ func runCmd(ctx *cli.Context) error {
 		hexInput = []byte(ctx.GlobalString(InputFlag.Name))
 	}
 	input := common.FromHex(string(bytes.TrimSpace(hexInput)))
+
+	var execFunc func() ([]byte, uint64, error)
 	if ctx.GlobalBool(CreateFlag.Name) {
 		input = append(code, input...)
-		ret, _, leftOverGas, err = runtime.Create(input, &runtimeConfig)
+		execFunc = func() ([]byte, uint64, error) {
+			output, _, gasLeft, err := runtime.Create(input, &runtimeConfig)
+			return output, gasLeft, err
+		}
 	} else {
 		if len(code) > 0 {
 			statedb.SetCode(receiver, code)
 		}
-		ret, leftOverGas, err = runtime.Call(receiver, input, &runtimeConfig)
+		execFunc = func() ([]byte, uint64, error) {
+			return runtime.Call(receiver, input, &runtimeConfig)
+		}
 	}
-	execTime := time.Since(tstart)
+
+	bench := ctx.GlobalBool(BenchFlag.Name)
+	output, leftOverGas, stats, err := timedExec(bench, execFunc)

 	if ctx.GlobalBool(DumpFlag.Name) {
 		statedb.Commit(true)
@@ -254,20 +295,15 @@ func runCmd(ctx *cli.Context) error {
 		vm.WriteLogs(os.Stderr, statedb.Logs())
 	}

-	if ctx.GlobalBool(StatDumpFlag.Name) {
-		var mem goruntime.MemStats
-		goruntime.ReadMemStats(&mem)
-		fmt.Fprintf(os.Stderr, `evm execution time: %v
-heap objects:       %d
-allocations:        %d
-total allocations:  %d
-GC calls:           %d
-Gas used:           %d
-
-`, execTime, mem.HeapObjects, mem.Alloc, mem.TotalAlloc, mem.NumGC, initialGas-leftOverGas)
+	if bench || ctx.GlobalBool(StatDumpFlag.Name) {
+		fmt.Fprintf(os.Stderr, `EVM gas used:    %d
+execution time:  %v
+allocations:     %d
+allocated bytes: %d
+`, initialGas-leftOverGas, stats.time, stats.allocs, stats.bytesAllocated)
 	}
 	if tracer == nil {
-		fmt.Printf("0x%x\n", ret)
+		fmt.Printf("0x%x\n", output)
 		if err != nil {
 			fmt.Printf(" error: %v\n", err)
 		}
--- a/cmd/evm/staterunner.go
+++ b/cmd/evm/staterunner.go
@@ -59,8 +59,10 @@ func stateTestCmd(ctx *cli.Context) error {

 	// Configure the EVM logger
 	config := &vm.LogConfig{
-		DisableMemory: ctx.GlobalBool(DisableMemoryFlag.Name),
-		DisableStack:  ctx.GlobalBool(DisableStackFlag.Name),
+		DisableMemory:     ctx.GlobalBool(DisableMemoryFlag.Name),
+		DisableStack:      ctx.GlobalBool(DisableStackFlag.Name),
+		DisableStorage:    ctx.GlobalBool(DisableStorageFlag.Name),
+		DisableReturnData: ctx.GlobalBool(DisableReturnDataFlag.Name),
 	}
 	var (
 		tracer   vm.Tracer
@@ -96,7 +98,7 @@ func stateTestCmd(ctx *cli.Context) error {
 		for _, st := range test.Subtests() {
 			// Run the test and aggregate the result
 			result := &StatetestResult{Name: key, Fork: st.Fork, Pass: true}
-			state, err := test.Run(st, cfg)
+			_, state, err := test.Run(st, cfg, false)
 			// print state root for evmlab tracing
 			if ctx.GlobalBool(MachineFlag.Name) && state != nil {
 				fmt.Fprintf(os.Stderr, "{\"stateRoot\": \"%x\"}\n", state.IntermediateRoot(false))
--- a/cmd/evm/testdata/1/alloc.json
+++ b/cmd/evm/testdata/1/alloc.json
@@ -0,0 +1,12 @@
+{
+  "a94f5374fce5edbc8e2a8697c15331677e6ebf0b": {
+    "balance": "0x5ffd4878be161d74",
+    "code": "0x",
+    "nonce": "0xac",
+    "storage": {}
+  },
+  "0x8a8eafb1cf62bfbeb1741769dae1a9dd47996192":{
+    "balance": "0xfeedbead",
+    "nonce" : "0x00"
+  }
+}
--- a/cmd/evm/testdata/1/env.json
+++ b/cmd/evm/testdata/1/env.json
@@ -0,0 +1,7 @@
+{
+  "currentCoinbase": "0xc94f5374fce5edbc8e2a8697c15331677e6ebf0b",
+  "currentDifficulty": "0x20000",
+  "currentGasLimit": "0x750a163df65e8a",
+  "currentNumber": "1",
+  "currentTimestamp": "1000"
+}
--- a/cmd/evm/testdata/1/txs.json
+++ b/cmd/evm/testdata/1/txs.json
@@ -0,0 +1,26 @@
+[
+  {
+    "gas": "0x5208",
+    "gasPrice": "0x2",
+    "hash": "0x0557bacce3375c98d806609b8d5043072f0b6a8bae45ae5a67a00d3a1a18d673",
+    "input": "0x",
+    "nonce": "0x0",
+    "r": "0x9500e8ba27d3c33ca7764e107410f44cbd8c19794bde214d694683a7aa998cdb",
+    "s": "0x7235ae07e4bd6e0206d102b1f8979d6adab280466b6a82d2208ee08951f1f600",
+    "to": "0x8a8eafb1cf62bfbeb1741769dae1a9dd47996192",
+    "v": "0x1b",
+    "value": "0x1"
+  },
+  {
+    "gas": "0x5208",
+    "gasPrice": "0x2",
+    "hash": "0x0557bacce3375c98d806609b8d5043072f0b6a8bae45ae5a67a00d3a1a18d673",
+    "input": "0x",
+    "nonce": "0x0",
+    "r": "0x9500e8ba27d3c33ca7764e107410f44cbd8c19794bde214d694683a7aa998cdb",
+    "s": "0x7235ae07e4bd6e0206d102b1f8979d6adab280466b6a82d2208ee08951f1f600",
+    "to": "0x8a8eafb1cf62bfbeb1741769dae1a9dd47996192",
+    "v": "0x1b",
+    "value": "0x1"
+  }
+]
--- a/cmd/evm/testdata/2/alloc.json
+++ b/cmd/evm/testdata/2/alloc.json
@@ -0,0 +1,16 @@
+{
+  "0x095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+    "balance" : "0x0de0b6b3a7640000",
+    "code" : "0x6001600053600160006001f0ff00",
+    "nonce" : "0x00",
+    "storage" : {
+    }
+  },
+  "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b" : {
+    "balance" : "0x0de0b6b3a7640000",
+    "code" : "0x",
+    "nonce" : "0x00",
+    "storage" : {
+    }
+  }
+}
--- a/cmd/evm/testdata/2/env.json
+++ b/cmd/evm/testdata/2/env.json
@@ -0,0 +1,7 @@
+{
+  "currentCoinbase" : "0x2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+  "currentDifficulty" : "0x020000",
+  "currentGasLimit" : "0x3b9aca00",
+  "currentNumber" : "0x01",
+  "currentTimestamp" : "0x03e8"
+}
--- a/cmd/evm/testdata/2/readme.md
+++ b/cmd/evm/testdata/2/readme.md
@@ -0,0 +1 @@
+These files examplify a selfdestruct to the `0`-address. 
--- a/cmd/evm/testdata/2/txs.json
+++ b/cmd/evm/testdata/2/txs.json
@@ -0,0 +1,14 @@
+[
+  {
+    "input" : "0x",
+    "gas" : "0x5f5e100",
+    "gasPrice" : "0x1",
+    "nonce" : "0x0",
+    "to" : "0x095e7baea6a6c7c4c2dfeb977efac326af552d87",
+    "value" : "0x186a0",
+    "v" : "0x1b",
+    "r" : "0x88544c93a564b4c28d2ffac2074a0c55fdd4658fe0d215596ed2e32e3ef7f56b",
+    "s" : "0x7fb4075d54190f825d7c47bb820284757b34fd6293904a93cddb1d3aa961ac28",
+    "hash" : "0x72fadbef39cd251a437eea619cfeda752271a5faaaa2147df012e112159ffb81"
+  }
+]
--- a/cmd/evm/testdata/3/alloc.json
+++ b/cmd/evm/testdata/3/alloc.json
@@ -0,0 +1,16 @@
+{
+  "0x095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+    "balance" : "0x0de0b6b3a7640000",
+    "code" : "0x600140",
+    "nonce" : "0x00",
+    "storage" : {
+    }
+  },
+  "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b" : {
+    "balance" : "0x0de0b6b3a7640000",
+    "code" : "0x",
+    "nonce" : "0x00",
+    "storage" : {
+    }
+  }
+}
--- a/Show More
+++ b/Show More
				`@@ -0,0 +1 @@`
				These files examplify a selfdestruct to the `0`-address.