4 files changed, 19 insertions, 0 deletions
diff --git a/consensus/clique/clique.go b/consensus/clique/clique.go
index c97e198..d3ad1d9 100644
--- a/consensus/clique/clique.go
+++ b/consensus/clique/clique.go
@@ -736,3 +736,7 @@ func encodeSigHeader(w io.Writer, header *types.Header) {
 		panic("can't encode: " + err.Error())
 	}
 }
+
+func (c *Clique) ExtraStateChange(_ *types.Block, _ *state.StateDB) error {
+	return nil
+}
diff --git a/consensus/consensus.go b/consensus/consensus.go
index 93fc9dc..603a3e9 100644
--- a/consensus/consensus.go
+++ b/consensus/consensus.go
@@ -114,6 +114,8 @@ type Engine interface {
 
 	// Close terminates any background threads maintained by the consensus engine.
 	Close() error
+
+	ExtraStateChange(block *types.Block, statedb *state.StateDB) error
 }
 
 // PoW is a consensus engine based on proof-of-work.
diff --git a/consensus/dummy/consensus.go b/consensus/dummy/consensus.go
index adc85fe..9d8db1e 100644
--- a/consensus/dummy/consensus.go
+++ b/consensus/dummy/consensus.go
@@ -21,6 +21,7 @@ import (
 type OnFinalizeCallbackType = func(chain consensus.ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction, uncles []*types.Header)
 type OnFinalizeAndAssembleCallbackType = func(chain consensus.ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction, uncles []*types.Header, receipts []*types.Receipt)
 type OnAPIsCallbackType = func(consensus.ChainReader) []rpc.API
+type OnExtraStateChangeType = func(block *types.Block, statedb *state.StateDB) error
 
 type ConsensusCallbacks struct {
 	OnSeal                func(*types.Block) error
@@ -28,6 +29,7 @@ type ConsensusCallbacks struct {
 	OnAPIs                OnAPIsCallbackType
 	OnFinalize            OnFinalizeCallbackType
 	OnFinalizeAndAssemble OnFinalizeAndAssembleCallbackType
+	OnExtraStateChange    OnExtraStateChangeType
 }
 
 type DummyEngine struct {
@@ -322,3 +324,10 @@ func (self *DummyEngine) APIs(chain consensus.ChainReader) (res []rpc.API) {
 func (self *DummyEngine) Close() error {
 	return nil
 }
+
+func (self *DummyEngine) ExtraStateChange(block *types.Block, statedb *state.StateDB) error {
+	if self.cb.OnExtraStateChange != nil {
+		return self.cb.OnExtraStateChange(block, statedb)
+	}
+	return nil
+}
diff --git a/consensus/ethash/consensus.go b/consensus/ethash/consensus.go
index d9130ec..c325eea 100644
--- a/consensus/ethash/consensus.go
+++ b/consensus/ethash/consensus.go
@@ -635,3 +635,7 @@ func accumulateRewards(config *params.ChainConfig, state *state.StateDB, header
 	}
 	state.AddBalance(header.Coinbase, reward)
 }
+
+func (ethash *Ethash) ExtraStateChange(_ *types.Block, _ *state.StateDB) error {
+	return nil
+}