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// Copyright 2017 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
// 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 <>.
package misc
import (
// VerifyForkHashes verifies that blocks conforming to network hard-forks do have
// the correct hashes, to avoid clients going off on different chains. This is an
// optional feature.
func VerifyForkHashes(config *params.ChainConfig, header *types.Header, uncle bool) error {
// We don't care about uncles
if uncle {
return nil
// If the homestead reprice hash is set, validate it
if config.EIP150Block != nil && config.EIP150Block.Cmp(header.Number) == 0 {
if config.EIP150Hash != (common.Hash{}) && config.EIP150Hash != header.Hash() {
return fmt.Errorf("homestead gas reprice fork: have 0x%x, want 0x%x", header.Hash(), config.EIP150Hash)
// All ok, return
return nil
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