diff --git a/eth/backend.go b/eth/backend.go
index 9f7ba79094..bb5f364624 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -205,15 +205,15 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 				endBlockNumber := startBlockNumber + rCheckpoint - 1
 				signers := make(map[common.Address]*rewardLog)
 				totalSigner := uint64(0)
+				// Get signers in blockSigner smartcontract.
+				client, err := contracts.GetEthClient(ctx)
+				if err != nil {
+					log.Error("Fail to connect IPC from blockSigner", "error", err)
+					return err
+				}
 
 				for i := startBlockNumber; i <= endBlockNumber; i++ {
-					// Get signers in blockSigner smartcontract.
-					client, err := contracts.GetEthClient(ctx)
-					if err != nil {
-						log.Error("Fail to connect IPC from blockSigner", "error", err)
-						return err
-					}
-					addrs, err := contracts.GetSignersFromContract(client, i					
+					addrs, err := contracts.GetSignersFromContract(client, i)
 					if err != nil {
 						log.Error("Fail to get signers from smartcontract.", "error", err, "blockNumber", i)
 						return err
@@ -420,7 +420,7 @@ func (self *Ethereum) SetEtherbase(etherbase common.Address) {
 }
 
 // ValidateMiner checks if node's address is in set of validators
-func (s *Ethereum) ValidateMiner() (bool, error) {
+func (s *Ethereum) ValidateStaker() (bool, error) {
 	eb, err := s.Etherbase()
 	if err != nil {
 		return false, err
@@ -442,7 +442,7 @@ func (s *Ethereum) ValidateMiner() (bool, error) {
 	return true, nil
 }
 
-func (s *Ethereum) StartMining(local bool) error {
+func (s *Ethereum) StartStaking(local bool) error {
 	eb, err := s.Etherbase()
 	if err != nil {
 		log.Error("Cannot start mining without etherbase", "err", err)