replace sha256 with pedersen_hash in get_key (#46)

* replace sha256 with pedersen_hash

* fix: prevent an OOB

* workaround timeout in unit test

* update go-ipa and reduce the timeout

* fix for unit tests: do not call NewAccessWitness in NewEVMTxContext (#49)

* potential fix: do not call NewAccessWitness in NewEVMTxContext

* more fixes: check for the existence of Accesses

* fix absence of witness in copy

* fix another witness issue

* workaround: ensure the prefetcher is off in verkle mode

* fix the remaining issues in tests

* review feedback

* fix witness allocation in stateless test

consensus/ethash/consensus.go

@@ -671,9 +671,8 @@ func accumulateRewards(config *params.ChainConfig, state *state.StateDB, header
 		r.Div(blockReward, big32)
 		reward.Add(reward, r)
 	}
-	coinbase := utils.GetTreeKeyBalance(header.Coinbase.Bytes())
-
-	if state.Witness() != nil {
+	if config.IsCancun(header.Number) {
+		coinbase := utils.GetTreeKeyBalance(header.Coinbase.Bytes())
 		state.Witness().TouchAddress(coinbase, state.GetBalance(header.Coinbase).Bytes())
 	}
 	state.AddBalance(header.Coinbase, reward)