diff --git a/pkg/core/blockchainer/blockchainer.go b/pkg/core/blockchainer/blockchainer.go
index 1e368f90f..0393a4059 100644
--- a/pkg/core/blockchainer/blockchainer.go
+++ b/pkg/core/blockchainer/blockchainer.go
@@ -37,6 +37,7 @@ type Blockchainer interface {
 	GetNEP5TransferLog(util.Uint160) *state.NEP5TransferLog
 	GetNEP5Balances(util.Uint160) *state.NEP5Balances
 	GetValidators(txes ...*transaction.Transaction) ([]*keys.PublicKey, error)
+	GetStandByValidators() (keys.PublicKeys, error)
 	GetScriptHashesForVerifying(*transaction.Transaction) ([]util.Uint160, error)
 	GetStorageItem(scripthash util.Uint160, key []byte) *state.StorageItem
 	GetStorageItems(hash util.Uint160) (map[string]*state.StorageItem, error)
diff --git a/pkg/network/helper_test.go b/pkg/network/helper_test.go
index 25e1fed7d..48db395a7 100644
--- a/pkg/network/helper_test.go
+++ b/pkg/network/helper_test.go
@@ -99,6 +99,9 @@ func (chain testChain) GetNEP5Balances(util.Uint160) *state.NEP5Balances {
 func (chain testChain) GetValidators(...*transaction.Transaction) ([]*keys.PublicKey, error) {
 	panic("TODO")
 }
+func (chain testChain) GetStandByValidators() (keys.PublicKeys, error) {
+	panic("TODO")
+}
 func (chain testChain) GetEnrollments() ([]*state.Validator, error) {
 	panic("TODO")
 }