diff --git a/pkg/core/blockchainer.go b/pkg/core/blockchainer.go
index 7038617b1..deb295fba 100644
--- a/pkg/core/blockchainer.go
+++ b/pkg/core/blockchainer.go
@@ -15,6 +15,7 @@ type Blockchainer interface {
 	BlockHeight() uint32
 	HeaderHeight() uint32
 	GetBlock(hash util.Uint256) (*Block, error)
+	GetContractState(hash util.Uint160) *ContractState
 	GetHeaderHash(int) util.Uint256
 	GetHeader(hash util.Uint256) (*Header, error)
 	CurrentHeaderHash() util.Uint256
@@ -23,6 +24,7 @@ type Blockchainer interface {
 	HasTransaction(util.Uint256) bool
 	GetAssetState(util.Uint256) *AssetState
 	GetAccountState(util.Uint160) *AccountState
+	GetScriptHashesForVerifying(*transaction.Transaction) ([]util.Uint160, error)
 	GetStorageItem(scripthash util.Uint160, key []byte) *StorageItem
 	GetStorageItems(hash util.Uint160) (map[string]*StorageItem, error)
 	GetTransaction(util.Uint256) (*transaction.Transaction, uint32, error)
diff --git a/pkg/network/helper_test.go b/pkg/network/helper_test.go
index 1b851b226..f42cb597c 100644
--- a/pkg/network/helper_test.go
+++ b/pkg/network/helper_test.go
@@ -56,6 +56,9 @@ func (chain testChain) HeaderHeight() uint32 {
 func (chain testChain) GetBlock(hash util.Uint256) (*core.Block, error) {
 	panic("TODO")
 }
+func (chain testChain) GetContractState(hash util.Uint160) *core.ContractState {
+	panic("TODO")
+}
 func (chain testChain) GetHeaderHash(int) util.Uint256 {
 	return util.Uint256{}
 }
@@ -69,6 +72,9 @@ func (chain testChain) GetAssetState(util.Uint256) *core.AssetState {
 func (chain testChain) GetAccountState(util.Uint160) *core.AccountState {
 	panic("TODO")
 }
+func (chain testChain) GetScriptHashesForVerifying(*transaction.Transaction) ([]util.Uint160, error) {
+	panic("TODO")
+}
 func (chain testChain) GetStorageItem(scripthash util.Uint160, key []byte) *core.StorageItem {
 	panic("TODO")
 }