Introducing ethash

pow/block.go

@@ -1,12 +1,20 @@
 package pow
 
-import "math/big"
+import (
+	"github.com/ethereum/go-ethereum/core/types"
+	"math/big"
+)
 
 type Block interface {
 	Difficulty() *big.Int
 	HashNoNonce() []byte
 	Nonce() []byte
-	Number() *big.Int
 	MixDigest() []byte
 	SeedHash() []byte
+	NumberU64() uint64
+}
+
+type ChainManager interface {
+	GetBlockByNumber(uint64) *types.Block
+	CurrentBlock() *types.Block
 }