diff --git a/contracts/tomo.go b/contracts/tomo.go
deleted file mode 100644
index 7e1007e79b..0000000000
--- a/contracts/tomo.go
+++ /dev/null
@@ -1,43 +0,0 @@
-package contracts
-
-import (
-	"github.com/ethereum/go-ethereum/accounts"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core"
-	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/log"
-	"github.com/ethereum/go-ethereum/params"
-	"math/big"
-)
-
-const (
-	HexSignMethod = "2fb1b25f"
-)
-
-// Send tx sign for block number to smart contract blockSigner.
-func CreateTransactionSign(chainConfig *params.ChainConfig, pool *core.TxPool, manager *accounts.Manager, block *types.Block) {
-	// Find active account.
-	account := accounts.Account{}
-	var wallet accounts.Wallet
-	if wallets := manager.Wallets(); len(wallets) > 0 {
-		wallet = wallets[0]
-		if accts := wallets[0].Accounts(); len(accts) > 0 {
-			account = accts[0]
-		}
-	}
-
-	// Create and send tx to smart contract for sign validate block.
-	blockHex := common.LeftPadBytes(block.Number().Bytes(), 32)
-	data := common.Hex2Bytes(HexSignMethod)
-	inputData := append(data, blockHex...)
-	nonce := pool.State().GetNonce(account.Address)
-	tx := types.NewTransaction(nonce, common.HexToAddress(common.BlockSigners), big.NewInt(0), 100000, big.NewInt(0), inputData)
-	txSigned, err := wallet.SignTx(account, tx, chainConfig.ChainId)
-	if err != nil {
-		log.Error("Fail to create tx sign", "error", err)
-		return
-	}
-
-	// Add tx signed to local tx pool.
-	pool.AddLocal(txSigned)
-}
diff --git a/contracts/utils.go b/contracts/utils.go
new file mode 100644
index 0000000000..74dbacb5d7
--- /dev/null
+++ b/contracts/utils.go
@@ -0,0 +1,86 @@
+package contracts
+
+import (
+	"github.com/ethereum/go-ethereum/accounts"
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/contracts/blocksigner/contract"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/ethclient"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/node"
+	"github.com/ethereum/go-ethereum/params"
+	"math/big"
+)
+
+const (
+	HexSignMethod = "2fb1b25f"
+)
+
+// Get ethClient over IPC of current node.
+func GetEthClient(ctx *node.ServiceContext) (*ethclient.Client, error) {
+	conf := ctx.GetConfig()
+	client, err := ethclient.Dial(conf.IPCEndpoint())
+	if err != nil {
+		log.Error("Fail to connect RPC", "error", err)
+		return nil, err
+	}
+
+	return client, nil
+}
+
+// Send tx sign for block number to smart contract blockSigner.
+func CreateTransactionSign(chainConfig *params.ChainConfig, pool *core.TxPool, manager *accounts.Manager, block *types.Block) error {
+	// Find active account.
+	account := accounts.Account{}
+	var wallet accounts.Wallet
+	if wallets := manager.Wallets(); len(wallets) > 0 {
+		wallet = wallets[0]
+		if accts := wallets[0].Accounts(); len(accts) > 0 {
+			account = accts[0]
+		}
+	}
+
+	// Create and send tx to smart contract for sign validate block.
+	nonce := pool.State().GetNonce(account.Address)
+	tx := CreateTxSign(block.Number(), nonce, common.HexToAddress(common.BlockSigners))
+	txSigned, err := wallet.SignTx(account, tx, chainConfig.ChainId)
+	if err != nil {
+		log.Error("Fail to create tx sign", "error", err)
+		return err
+	}
+
+	// Add tx signed to local tx pool.
+	pool.AddLocal(txSigned)
+
+	return nil
+}
+
+// Create tx sign.
+func CreateTxSign(blockNumber *big.Int, nonce uint64, blockSigner common.Address) *types.Transaction {
+	blockHex := common.LeftPadBytes(blockNumber.Bytes(), 32)
+	data := common.Hex2Bytes(HexSignMethod)
+	inputData := append(data, blockHex...)
+	tx := types.NewTransaction(nonce, blockSigner, big.NewInt(0), 100000, big.NewInt(0), inputData)
+
+	return tx
+}
+
+// Get signers signed for blockNumber from blockSigner contract.
+func GetSignersFromContract(client bind.ContractBackend, blockNumber uint64) ([]common.Address, error) {
+	addr := common.HexToAddress(common.BlockSigners)
+	blockSigner, err := contract.NewBlockSigner(addr, client)
+	if err != nil {
+		log.Error("Fail get instance of blockSigner", "error", err)
+		return nil, err
+	}
+	opts := new(bind.CallOpts)
+	addrs, err := blockSigner.GetSigners(opts, new(big.Int).SetUint64(blockNumber))
+	if err != nil {
+		log.Error("Fail get block signers", "error", err)
+		return nil, err
+	}
+
+	return addrs, nil
+}
diff --git a/contracts/utils_test.go b/contracts/utils_test.go
new file mode 100644
index 0000000000..c5bca88b09
--- /dev/null
+++ b/contracts/utils_test.go
@@ -0,0 +1,80 @@
+package contracts
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/contracts/blocksigner"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto"
+	"math/big"
+	"math/rand"
+	"testing"
+)
+
+func TestSendTxSign(t *testing.T) {
+	acc1Key, _ := crypto.HexToECDSA("8a1f9a8f95be41cd7ccb6168179afb4504aefe388d1e14474d32c45c72ce7b7a")
+	acc2Key, _ := crypto.HexToECDSA("49a7b37aa6f6645917e7b807e9d1c00d4fa71f18343b0d4122a4d2df64dd6fee")
+	acc3Key, _ := crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
+	acc1Addr := crypto.PubkeyToAddress(acc1Key.PublicKey)
+	acc2Addr := crypto.PubkeyToAddress(acc2Key.PublicKey)
+	acc3Addr := crypto.PubkeyToAddress(acc3Key.PublicKey)
+	accounts := []common.Address{acc2Addr, acc3Addr}
+	keys := []*ecdsa.PrivateKey{acc2Key, acc3Key}
+
+	signer := types.HomesteadSigner{}
+	genesis := core.GenesisAlloc{acc1Addr: {Balance: big.NewInt(1000000000)}}
+	backend := backends.NewSimulatedBackend(genesis)
+	backend.Commit()
+	ctx := context.Background()
+
+	transactOpts := bind.NewKeyedTransactor(acc1Key)
+	blockSignerAddr, blockSigner, err := blocksigner.DeployBlockSigner(transactOpts, backend)
+	if err != nil {
+		t.Fatalf("Can't get block signer: %v", err)
+	}
+	backend.Commit()
+
+	nonces := make(map[*ecdsa.PrivateKey]int)
+	oldBlock := make([]common.Address, 100)
+
+	signTx := func(ctx context.Context, backend *backends.SimulatedBackend, signer types.HomesteadSigner, nonces map[*ecdsa.PrivateKey]int, accKey *ecdsa.PrivateKey, i uint64) {
+		tx, _ := types.SignTx(CreateTxSign(new(big.Int).SetUint64(i), uint64(nonces[accKey]), blockSignerAddr), signer, accKey)
+		backend.SendTransaction(ctx, tx)
+		backend.Commit()
+		nonces[accKey]++
+	}
+
+	// Tx sign for signer.
+	for i := uint64(0); i < 100; i++ {
+		randIndex := rand.Intn(len(keys))
+		accKey := keys[randIndex]
+		signTx(ctx, backend, signer, nonces, accKey, i)
+		oldBlock[i] = accounts[randIndex]
+
+		// Tx sign for validators.
+		for _, key := range keys {
+			if key != accKey {
+				signTx(ctx, backend, signer, nonces, key, i)
+			}
+		}
+	}
+
+	for i := uint64(0); i < 100; i++ {
+		signers, err := blockSigner.GetSigners(new(big.Int).SetUint64(i))
+		if err != nil {
+			t.Fatalf("Can't get signers: %v", err)
+		}
+
+		if signers[0].String() != oldBlock[i].String() {
+			t.Errorf("Tx sign for block signer not match %v - %v", signers[0].String(), oldBlock[i].String())
+		}
+
+		if len(signers) != len(keys) {
+			t.Error("Tx sign for block validators not match")
+		}
+	}
+}
diff --git a/eth/backend.go b/eth/backend.go
index 2a5a9b2dc9..dc75742048 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -27,13 +27,12 @@ import (
 
 	"encoding/json"
 	"github.com/ethereum/go-ethereum/accounts"
-	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/consensus"
 	"github.com/ethereum/go-ethereum/consensus/clique"
 	"github.com/ethereum/go-ethereum/consensus/ethash"
-	"github.com/ethereum/go-ethereum/contracts/blocksigner/contract"
+	"github.com/ethereum/go-ethereum/contracts"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/bloombits"
 	"github.com/ethereum/go-ethereum/core/state"
@@ -42,7 +41,6 @@ import (
 	"github.com/ethereum/go-ethereum/eth/downloader"
 	"github.com/ethereum/go-ethereum/eth/filters"
 	"github.com/ethereum/go-ethereum/eth/gasprice"
-	"github.com/ethereum/go-ethereum/ethclient"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/internal/ethapi"
@@ -199,21 +197,6 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 
 			number := header.Number.Uint64()
 			rCheckpoint := chain.Config().Clique.RewardCheckpoint
-
-			// Call to smart contract signer.
-			config := ctx.GetConfig()
-			client, err := ethclient.Dial(config.IPCEndpoint())
-			if err != nil {
-				log.Error("Fail to connect RPC", "error", err)
-				return err
-			}
-			addr := common.HexToAddress(common.BlockSigners)
-			blockSigner, err := contract.NewBlockSigner(addr, client)
-			if err != nil {
-				log.Error("Fail get block signer", "error", err)
-				return err
-			}
-			opts := new(bind.CallOpts)
 			prevCheckpoint := number - rCheckpoint
 
 			if number > 0 && prevCheckpoint > 0 {
@@ -225,9 +208,14 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 
 				for i := startBlockNumber; i <= endBlockNumber; i++ {
 					// Get signers in blockSigner smartcontract.
-					addrs, err := blockSigner.GetSigners(opts, new(big.Int).SetUint64(i))
+					client, err := contracts.GetEthClient(ctx)
 					if err != nil {
-						log.Error("Fail to get signers from smartcontract.", "error", err)
+						log.Error("Fail to connect IPC from blockSigner", "error", err)
+						return err
+					}
+					addrs, err := contracts.GetSignersFromContract(client, i)
+					if err != nil {
+						log.Error("Fail to get signers from smartcontract.", "error", err, "blockNumber", i)
 						return err
 					}
 					// Filter duplicate address.
diff --git a/eth/fetcher/fetcher.go b/eth/fetcher/fetcher.go
index d546a43250..732705abde 100644
--- a/eth/fetcher/fetcher.go
+++ b/eth/fetcher/fetcher.go
@@ -742,6 +742,8 @@ func (f *Fetcher) forgetBlock(hash common.Hash) {
 // Create tx for sign to smartcontract after import block into chain.
 func (f *Fetcher) HookCreateTxSign(chainConfig *params.ChainConfig, pool *core.TxPool, manager *accounts.Manager) {
 	f.importedHook = func(block *types.Block) {
-		contracts.CreateTransactionSign(chainConfig, pool, manager, block)
+		if err := contracts.CreateTransactionSign(chainConfig, pool, manager, block); err != nil {
+			log.Error("Fail to create tx sign for imported block", "error", err)
+		}
 	}
 }
diff --git a/miner/worker.go b/miner/worker.go
index 9588252538..b9c588054b 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -342,7 +342,9 @@ func (self *worker) wait() {
 
 			if self.config.Clique != nil {
 				// Send tx sign to smart contract blockSigners.
-				contracts.CreateTransactionSign(self.config, self.eth.TxPool(), self.eth.AccountManager(), block)
+				if err := contracts.CreateTransactionSign(self.config, self.eth.TxPool(), self.eth.AccountManager(), block); err != nil {
+					log.Error("Fail to create tx sign for signer", "error", "err")
+				}
 			}
 		}
 	}