diff --git a/core/block_processor.go b/core/block_processor.go
index 7eaeb5be0..efad35bf4 100644
--- a/core/block_processor.go
+++ b/core/block_processor.go
@@ -105,6 +105,9 @@ func (self *BlockProcessor) ApplyTransaction(coinbase *state.StateObject, stated
 
 	return receipt, txGas, err
 }
+func (self *BlockProcessor) ChainManager() *ChainManager {
+	return self.bc
+}
 
 func (self *BlockProcessor) ApplyTransactions(coinbase *state.StateObject, statedb *state.StateDB, block *types.Block, txs types.Transactions, transientProcess bool) (types.Receipts, types.Transactions, types.Transactions, types.Transactions, error) {
 	var (
diff --git a/core/chain_manager_test.go b/core/chain_manager_test.go
index b76ac187c..e6614212f 100644
--- a/core/chain_manager_test.go
+++ b/core/chain_manager_test.go
@@ -14,9 +14,7 @@ import (
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/event"
-	"github.com/ethereum/go-ethereum/pow"
 	"github.com/ethereum/go-ethereum/rlp"
-	"github.com/ethereum/go-ethereum/state"
 )
 
 func init() {
diff --git a/pow/block.go b/pow/block.go
index 86a6aa1b0..129f96fd3 100644
--- a/pow/block.go
+++ b/pow/block.go
@@ -7,4 +7,6 @@ type Block interface {
 	HashNoNonce() []byte
 	Nonce() []byte
 	Number() *big.Int
+	MixDigest() []byte
+	SeedHash() []byte
 }