diff --git a/common/common.go b/common/common.go
index 1371d18d4..155bb5c2a 100644
--- a/common/common.go
+++ b/common/common.go
@@ -65,6 +65,15 @@ func DefaultDataDir() string {
 	}
 }
 
+func ToHex(b []byte) string {
+	hex := Bytes2Hex(b)
+	// Prefer output of "0x0" instead of "0x"
+	if len(hex) == 0 {
+		hex = "0"
+	}
+	return "0x" + hex
+}
+
 func FromHex(s string) []byte {
 	if len(s) > 1 {
 		if s[0:2] == "0x" {
diff --git a/rpc/api.go b/rpc/api.go
index 1846e7db5..7ce360f86 100644
--- a/rpc/api.go
+++ b/rpc/api.go
@@ -9,11 +9,11 @@ import (
 	"sync"
 	"time"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethdb"
-	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/event/filter"
 	"github.com/ethereum/go-ethereum/state"
@@ -251,7 +251,7 @@ func (p *EthereumApi) Transact(args *NewTxArgs, reply *interface{}) (err error)
 
 			result, _ := account.Transact(common.FromHex(args.To), common.FromHex(args.Value), common.FromHex(args.Gas), common.FromHex(args.GasPrice), common.FromHex(args.Data))
 			if len(result) > 0 {
-				*reply = toHex(result)
+				*reply = common.ToHex(result)
 			}
 		} else if _, exists := p.register[args.From]; exists {
 			p.register[ags.From] = append(p.register[args.From], args)
@@ -291,7 +291,7 @@ func (p *EthereumApi) GetBalance(args *GetBalanceArgs, reply *interface{}) error
 		return err
 	}
 	state := p.getStateWithNum(args.BlockNumber).SafeGet(args.Address)
-	*reply = toHex(state.Balance().Bytes())
+	*reply = common.ToHex(state.Balance().Bytes())
 	return nil
 }
 
@@ -384,7 +384,7 @@ func (p *EthereumApi) NewWhisperFilter(args *WhisperFilterArgs, reply *interface
 	}
 	id = p.xeth().Whisper().Watch(opts)
 	p.messages[id] = &whisperFilter{timeout: time.Now()}
-	*reply = toHex(big.NewInt(int64(id)).Bytes())
+	*reply = common.ToHex(big.NewInt(int64(id)).Bytes())
 	return nil
 }
 
@@ -480,7 +480,7 @@ func (p *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) error
 		if err := json.Unmarshal(req.Params, &args); err != nil {
 			return err
 		}
-		*reply = toHex(crypto.Sha3(common.FromHex(args.Data)))
+		*reply = common.ToHex(crypto.Sha3(common.FromHex(args.Data)))
 	case "web3_clientVersion":
 		*reply = p.xeth().Backend().Version()
 	case "net_version":
@@ -488,7 +488,7 @@ func (p *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) error
 	case "net_listening":
 		*reply = p.xeth().IsListening()
 	case "net_peerCount":
-		*reply = toHex(big.NewInt(int64(p.xeth().PeerCount())).Bytes())
+		*reply = common.ToHex(big.NewInt(int64(p.xeth().PeerCount())).Bytes())
 	case "eth_coinbase":
 		// TODO handling of empty coinbase due to lack of accounts
 		res := p.xeth().Coinbase()
@@ -500,11 +500,11 @@ func (p *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) error
 	case "eth_mining":
 		*reply = p.xeth().IsMining()
 	case "eth_gasPrice":
-		*reply = toHex(defaultGasPrice.Bytes())
+		*reply = common.ToHex(defaultGasPrice.Bytes())
 	case "eth_accounts":
 		*reply = p.xeth().Accounts()
 	case "eth_blockNumber":
-		*reply = toHex(p.xeth().Backend().ChainManager().CurrentBlock().Number().Bytes())
+		*reply = common.ToHex(p.xeth().Backend().ChainManager().CurrentBlock().Number().Bytes())
 	case "eth_getBalance":
 		args := new(GetBalanceArgs)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
@@ -539,7 +539,7 @@ func (p *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) error
 		if err != nil {
 			return err
 		}
-		*reply = toHex(big.NewInt(v).Bytes())
+		*reply = common.ToHex(big.NewInt(v).Bytes())
 	case "eth_getBlockTransactionCountByNumber":
 		args := new(GetBlockByNumberArgs)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
@@ -550,7 +550,7 @@ func (p *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) error
 		if err != nil {
 			return err
 		}
-		*reply = toHex(big.NewInt(v).Bytes())
+		*reply = common.ToHex(big.NewInt(v).Bytes())
 	case "eth_getUncleCountByBlockHash":
 		args := new(GetBlockByHashArgs)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
@@ -561,7 +561,7 @@ func (p *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) error
 		if err != nil {
 			return err
 		}
-		*reply = toHex(big.NewInt(v).Bytes())
+		*reply = common.ToHex(big.NewInt(v).Bytes())
 	case "eth_getUncleCountByBlockNumber":
 		args := new(GetBlockByNumberArgs)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
@@ -572,7 +572,7 @@ func (p *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) error
 		if err != nil {
 			return err
 		}
-		*reply = toHex(big.NewInt(v).Bytes())
+		*reply = common.ToHex(big.NewInt(v).Bytes())
 	case "eth_getData", "eth_getCode":
 		args := new(GetDataArgs)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
@@ -663,7 +663,7 @@ func (p *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) error
 			return NewValidationError("Index", "does not exist")
 		}
 
-		uncle, err := p.GetBlockByHash(toHex(v.Uncles[args.Index]), false)
+		uncle, err := p.GetBlockByHash(common.ToHex(v.Uncles[args.Index]), false)
 		if err != nil {
 			return err
 		}
@@ -682,7 +682,7 @@ func (p *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) error
 			return NewValidationError("Index", "does not exist")
 		}
 
-		uncle, err := p.GetBlockByHash(toHex(v.Uncles[args.Index]), false)
+		uncle, err := p.GetBlockByHash(common.ToHex(v.Uncles[args.Index]), false)
 		if err != nil {
 			return err
 		}
diff --git a/rpc/responses.go b/rpc/responses.go
index f41ce7b96..eec483fb7 100644
--- a/rpc/responses.go
+++ b/rpc/responses.go
@@ -5,6 +5,7 @@ import (
 	// "fmt"
 	"math/big"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 )
 
@@ -56,23 +57,23 @@ func (b *BlockRes) MarshalJSON() ([]byte, error) {
 	}
 
 	// convert strict types to hexified strings
-	ext.BlockNumber = toHex(big.NewInt(b.BlockNumber).Bytes())
-	ext.BlockHash = toHex(b.BlockHash)
-	ext.ParentHash = toHex(b.ParentHash)
-	ext.Nonce = toHex(b.Nonce)
-	ext.Sha3Uncles = toHex(b.Sha3Uncles)
-	ext.LogsBloom = toHex(b.LogsBloom)
-	ext.TransactionRoot = toHex(b.TransactionRoot)
-	ext.StateRoot = toHex(b.StateRoot)
-	ext.Miner = toHex(b.Miner)
-	ext.Difficulty = toHex(big.NewInt(b.Difficulty).Bytes())
-	ext.TotalDifficulty = toHex(big.NewInt(b.TotalDifficulty).Bytes())
-	ext.Size = toHex(big.NewInt(b.Size).Bytes())
-	// ext.ExtraData = toHex(b.ExtraData)
-	ext.GasLimit = toHex(big.NewInt(b.GasLimit).Bytes())
-	// ext.MinGasPrice = toHex(big.NewInt(b.MinGasPrice).Bytes())
-	ext.GasUsed = toHex(big.NewInt(b.GasUsed).Bytes())
-	ext.UnixTimestamp = toHex(big.NewInt(b.UnixTimestamp).Bytes())
+	ext.BlockNumber = common.ToHex(big.NewInt(b.BlockNumber).Bytes())
+	ext.BlockHash = common.ToHex(b.BlockHash)
+	ext.ParentHash = common.ToHex(b.ParentHash)
+	ext.Nonce = common.ToHex(b.Nonce)
+	ext.Sha3Uncles = common.ToHex(b.Sha3Uncles)
+	ext.LogsBloom = common.ToHex(b.LogsBloom)
+	ext.TransactionRoot = common.ToHex(b.TransactionRoot)
+	ext.StateRoot = common.ToHex(b.StateRoot)
+	ext.Miner = common.ToHex(b.Miner)
+	ext.Difficulty = common.ToHex(big.NewInt(b.Difficulty).Bytes())
+	ext.TotalDifficulty = common.ToHex(big.NewInt(b.TotalDifficulty).Bytes())
+	ext.Size = common.ToHex(big.NewInt(b.Size).Bytes())
+	// ext.ExtraData = common.ToHex(b.ExtraData)
+	ext.GasLimit = common.ToHex(big.NewInt(b.GasLimit).Bytes())
+	// ext.MinGasPrice = common.ToHex(big.NewInt(b.MinGasPrice).Bytes())
+	ext.GasUsed = common.ToHex(big.NewInt(b.GasUsed).Bytes())
+	ext.UnixTimestamp = common.ToHex(big.NewInt(b.UnixTimestamp).Bytes())
 	ext.Transactions = make([]interface{}, len(b.Transactions))
 	if b.fullTx {
 		for i, tx := range b.Transactions {
@@ -80,12 +81,12 @@ func (b *BlockRes) MarshalJSON() ([]byte, error) {
 		}
 	} else {
 		for i, tx := range b.Transactions {
-			ext.Transactions[i] = toHex(tx.Hash)
+			ext.Transactions[i] = common.ToHex(tx.Hash)
 		}
 	}
 	ext.Uncles = make([]string, len(b.Uncles))
 	for i, v := range b.Uncles {
-		ext.Uncles[i] = toHex(v)
+		ext.Uncles[i] = common.ToHex(v)
 	}
 
 	return json.Marshal(ext)
@@ -160,17 +161,17 @@ func (t *TransactionRes) MarshalJSON() ([]byte, error) {
 		Input       string `json:"input"`
 	}
 
-	ext.Hash = toHex(t.Hash)
-	ext.Nonce = toHex(big.NewInt(t.Nonce).Bytes())
-	ext.BlockHash = toHex(t.BlockHash)
-	ext.BlockNumber = toHex(big.NewInt(t.BlockNumber).Bytes())
-	ext.TxIndex = toHex(big.NewInt(t.TxIndex).Bytes())
-	ext.From = toHex(t.From)
-	ext.To = toHex(t.To)
-	ext.Value = toHex(big.NewInt(t.Value).Bytes())
-	ext.Gas = toHex(big.NewInt(t.Gas).Bytes())
-	ext.GasPrice = toHex(big.NewInt(t.GasPrice).Bytes())
-	ext.Input = toHex(t.Input)
+	ext.Hash = common.ToHex(t.Hash)
+	ext.Nonce = common.ToHex(big.NewInt(t.Nonce).Bytes())
+	ext.BlockHash = common.ToHex(t.BlockHash)
+	ext.BlockNumber = common.ToHex(big.NewInt(t.BlockNumber).Bytes())
+	ext.TxIndex = common.ToHex(big.NewInt(t.TxIndex).Bytes())
+	ext.From = common.ToHex(t.From)
+	ext.To = common.ToHex(t.To)
+	ext.Value = common.ToHex(big.NewInt(t.Value).Bytes())
+	ext.Gas = common.ToHex(big.NewInt(t.Gas).Bytes())
+	ext.GasPrice = common.ToHex(big.NewInt(t.GasPrice).Bytes())
+	ext.Input = common.ToHex(t.Input)
 
 	return json.Marshal(ext)
 }
diff --git a/rpc/util.go b/rpc/util.go
index 08f404c99..6afefbf61 100644
--- a/rpc/util.go
+++ b/rpc/util.go
@@ -119,17 +119,8 @@ func (self JsonWrapper) ParseRequestBody(req *http.Request) (RpcRequest, error)
 	return reqParsed, nil
 }
 
-func toHex(b []byte) string {
-	hex := common.Bytes2Hex(b)
-	// Prefer output of "0x0" instead of "0x"
-	if len(hex) == 0 {
-		hex = "0"
-	}
-	return "0x" + hex
-}
-
 func i2hex(n int) string {
-	return toHex(big.NewInt(int64(n)).Bytes())
+	return common.ToHex(big.NewInt(int64(n)).Bytes())
 }
 
 type RpcServer interface {
@@ -150,11 +141,11 @@ func toLogs(logs state.Logs) (ls []Log) {
 	for i, log := range logs {
 		var l Log
 		l.Topic = make([]string, len(log.Topics()))
-		l.Address = toHex(log.Address())
-		l.Data = toHex(log.Data())
+		l.Address = common.ToHex(log.Address())
+		l.Data = common.ToHex(log.Data())
 		l.Number = log.Number()
 		for j, topic := range log.Topics() {
-			l.Topic[j] = toHex(topic)
+			l.Topic[j] = common.ToHex(topic)
 		}
 		ls[i] = l
 	}
diff --git a/ui/qt/qwhisper/whisper.go b/ui/qt/qwhisper/whisper.go
index 90ec822aa..bf165bbcc 100644
--- a/ui/qt/qwhisper/whisper.go
+++ b/ui/qt/qwhisper/whisper.go
@@ -4,8 +4,8 @@ package qwhisper
 import (
 	"time"
 
-	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/whisper"
 	"github.com/obscuren/qml"
@@ -13,8 +13,6 @@ import (
 
 var qlogger = logger.NewLogger("QSHH")
 
-func toHex(b []byte) string { return "0x" + common.Bytes2Hex(b) }
-
 type Whisper struct {
 	*whisper.Whisper
 	view qml.Object
@@ -66,7 +64,7 @@ func (self *Whisper) Post(payload []string, to, from string, topics []string, pr
 func (self *Whisper) NewIdentity() string {
 	key := self.Whisper.NewIdentity()
 
-	return toHex(crypto.FromECDSAPub(&key.PublicKey))
+	return common.ToHex(crypto.FromECDSAPub(&key.PublicKey))
 }
 
 func (self *Whisper) HasIdentity(key string) bool {
diff --git a/xeth/types.go b/xeth/types.go
index e15305481..6b3b6d29f 100644
--- a/xeth/types.go
+++ b/xeth/types.go
@@ -5,19 +5,15 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
-	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/p2p"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/state"
 )
 
-func toHex(b []byte) string {
-	return "0x" + common.Bytes2Hex(b)
-}
-
 type Object struct {
 	*state.StateObject
 }
@@ -49,7 +45,7 @@ func (self *Object) Storage() (storage map[string]string) {
 	for it.Next() {
 		var data []byte
 		rlp.Decode(bytes.NewReader(it.Value), &data)
-		storage[toHex(it.Key)] = toHex(data)
+		storage[common.ToHex(it.Key)] = common.ToHex(data)
 	}
 
 	return
@@ -59,19 +55,19 @@ func (self *Object) Storage() (storage map[string]string) {
 type Block struct {
 	//Transactions string `json:"transactions"`
 	ref          *types.Block
-	Size         string        `json:"size"`
-	Number       int           `json:"number"`
-	Hash         string        `json:"hash"`
+	Size         string       `json:"size"`
+	Number       int          `json:"number"`
+	Hash         string       `json:"hash"`
 	Transactions *common.List `json:"transactions"`
 	Uncles       *common.List `json:"uncles"`
-	Time         int64         `json:"time"`
-	Coinbase     string        `json:"coinbase"`
-	Name         string        `json:"name"`
-	GasLimit     string        `json:"gasLimit"`
-	GasUsed      string        `json:"gasUsed"`
-	PrevHash     string        `json:"prevHash"`
-	Bloom        string        `json:"bloom"`
-	Raw          string        `json:"raw"`
+	Time         int64        `json:"time"`
+	Coinbase     string       `json:"coinbase"`
+	Name         string       `json:"name"`
+	GasLimit     string       `json:"gasLimit"`
+	GasUsed      string       `json:"gasUsed"`
+	PrevHash     string       `json:"prevHash"`
+	Bloom        string       `json:"bloom"`
+	Raw          string       `json:"raw"`
 }
 
 // Creates a new QML Block from a chain block
@@ -95,12 +91,12 @@ func NewBlock(block *types.Block) *Block {
 	return &Block{
 		ref: block, Size: block.Size().String(),
 		Number: int(block.NumberU64()), GasUsed: block.GasUsed().String(),
-		GasLimit: block.GasLimit().String(), Hash: toHex(block.Hash()),
+		GasLimit: block.GasLimit().String(), Hash: common.ToHex(block.Hash()),
 		Transactions: txlist, Uncles: ulist,
 		Time:     block.Time(),
-		Coinbase: toHex(block.Coinbase()),
-		PrevHash: toHex(block.ParentHash()),
-		Bloom:    toHex(block.Bloom()),
+		Coinbase: common.ToHex(block.Coinbase()),
+		PrevHash: common.ToHex(block.ParentHash()),
+		Bloom:    common.ToHex(block.Bloom()),
 		Raw:      block.String(),
 	}
 }
@@ -139,22 +135,22 @@ type Transaction struct {
 }
 
 func NewTx(tx *types.Transaction) *Transaction {
-	hash := toHex(tx.Hash())
-	receiver := toHex(tx.To())
+	hash := common.ToHex(tx.Hash())
+	receiver := common.ToHex(tx.To())
 	if len(receiver) == 0 {
-		receiver = toHex(core.AddressFromMessage(tx))
+		receiver = common.ToHex(core.AddressFromMessage(tx))
 	}
-	sender := toHex(tx.From())
+	sender := common.ToHex(tx.From())
 	createsContract := core.MessageCreatesContract(tx)
 
 	var data string
 	if createsContract {
 		data = strings.Join(core.Disassemble(tx.Data()), "\n")
 	} else {
-		data = toHex(tx.Data())
+		data = common.ToHex(tx.Data())
 	}
 
-	return &Transaction{ref: tx, Hash: hash, Value: common.CurrencyToString(tx.Value()), Address: receiver, Contract: createsContract, Gas: tx.Gas().String(), GasPrice: tx.GasPrice().String(), Data: data, Sender: sender, CreatesContract: createsContract, RawData: toHex(tx.Data())}
+	return &Transaction{ref: tx, Hash: hash, Value: common.CurrencyToString(tx.Value()), Address: receiver, Contract: createsContract, Gas: tx.Gas().String(), GasPrice: tx.GasPrice().String(), Data: data, Sender: sender, CreatesContract: createsContract, RawData: common.ToHex(tx.Data())}
 }
 
 func (self *Transaction) ToString() string {
@@ -168,7 +164,7 @@ type Key struct {
 }
 
 func NewKey(key *crypto.KeyPair) *Key {
-	return &Key{toHex(key.Address()), toHex(key.PrivateKey), toHex(key.PublicKey)}
+	return &Key{common.ToHex(key.Address()), common.ToHex(key.PrivateKey), common.ToHex(key.PublicKey)}
 }
 
 type PReceipt struct {
@@ -181,9 +177,9 @@ type PReceipt struct {
 func NewPReciept(contractCreation bool, creationAddress, hash, address []byte) *PReceipt {
 	return &PReceipt{
 		contractCreation,
-		toHex(creationAddress),
-		toHex(hash),
-		toHex(address),
+		common.ToHex(creationAddress),
+		common.ToHex(hash),
+		common.ToHex(address),
 	}
 }
 
@@ -220,8 +216,8 @@ type Receipt struct {
 func NewReciept(contractCreation bool, creationAddress, hash, address []byte) *Receipt {
 	return &Receipt{
 		contractCreation,
-		toHex(creationAddress),
-		toHex(hash),
-		toHex(address),
+		common.ToHex(creationAddress),
+		common.ToHex(hash),
+		common.ToHex(address),
 	}
 }
diff --git a/xeth/whisper.go b/xeth/whisper.go
index 76bf8012a..c43eb4388 100644
--- a/xeth/whisper.go
+++ b/xeth/whisper.go
@@ -4,8 +4,8 @@ import (
 	"errors"
 	"time"
 
-	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/whisper"
 )
@@ -56,7 +56,7 @@ func (self *Whisper) Post(payload string, to, from string, topics []string, prio
 func (self *Whisper) NewIdentity() string {
 	key := self.Whisper.NewIdentity()
 
-	return toHex(crypto.FromECDSAPub(&key.PublicKey))
+	return common.ToHex(crypto.FromECDSAPub(&key.PublicKey))
 }
 
 func (self *Whisper) HasIdentity(key string) bool {
@@ -108,9 +108,9 @@ type WhisperMessage struct {
 func NewWhisperMessage(msg *whisper.Message) WhisperMessage {
 	return WhisperMessage{
 		ref:     msg,
-		Payload: toHex(msg.Payload),
-		From:    toHex(crypto.FromECDSAPub(msg.Recover())),
-		To:      toHex(crypto.FromECDSAPub(msg.To)),
+		Payload: common.ToHex(msg.Payload),
+		From:    common.ToHex(crypto.FromECDSAPub(msg.Recover())),
+		To:      common.ToHex(crypto.FromECDSAPub(msg.To)),
 		Sent:    msg.Sent,
 	}
 }
diff --git a/xeth/xeth.go b/xeth/xeth.go
index 6c7a26c04..115bd787a 100644
--- a/xeth/xeth.go
+++ b/xeth/xeth.go
@@ -8,10 +8,10 @@ import (
 	"math/big"
 
 	"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/crypto"
-	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/p2p"
@@ -170,7 +170,7 @@ func (self *XEth) Accounts() []string {
 	accounts, _ := self.eth.AccountManager().Accounts()
 	accountAddresses := make([]string, len(accounts))
 	for i, ac := range accounts {
-		accountAddresses[i] = toHex(ac.Address)
+		accountAddresses[i] = common.ToHex(ac.Address)
 	}
 	return accountAddresses
 }
@@ -201,7 +201,7 @@ func (self *XEth) IsListening() bool {
 
 func (self *XEth) Coinbase() string {
 	cb, _ := self.eth.AccountManager().Coinbase()
-	return toHex(cb)
+	return common.ToHex(cb)
 }
 
 func (self *XEth) NumberToHuman(balance string) string {
@@ -213,7 +213,7 @@ func (self *XEth) NumberToHuman(balance string) string {
 func (self *XEth) StorageAt(addr, storageAddr string) string {
 	storage := self.State().SafeGet(addr).StorageString(storageAddr)
 
-	return toHex(storage.Bytes())
+	return common.ToHex(storage.Bytes())
 }
 
 func (self *XEth) BalanceAt(addr string) string {
@@ -225,7 +225,7 @@ func (self *XEth) TxCountAt(address string) int {
 }
 
 func (self *XEth) CodeAt(address string) string {
-	return toHex(self.State().SafeGet(address).Code())
+	return common.ToHex(self.State().SafeGet(address).Code())
 }
 
 func (self *XEth) IsContract(address string) bool {
@@ -238,7 +238,7 @@ func (self *XEth) SecretToAddress(key string) string {
 		return ""
 	}
 
-	return toHex(pair.Address())
+	return common.ToHex(pair.Address())
 }
 
 type KeyVal struct {
@@ -251,7 +251,7 @@ func (self *XEth) EachStorage(addr string) string {
 	object := self.State().SafeGet(addr)
 	it := object.Trie().Iterator()
 	for it.Next() {
-		values = append(values, KeyVal{toHex(it.Key), toHex(it.Value)})
+		values = append(values, KeyVal{common.ToHex(it.Key), common.ToHex(it.Value)})
 	}
 
 	valuesJson, err := json.Marshal(values)
@@ -265,7 +265,7 @@ func (self *XEth) EachStorage(addr string) string {
 func (self *XEth) ToAscii(str string) string {
 	padded := common.RightPadBytes([]byte(str), 32)
 
-	return "0x" + toHex(padded)
+	return "0x" + common.ToHex(padded)
 }
 
 func (self *XEth) FromAscii(str string) string {
@@ -293,9 +293,9 @@ func (self *XEth) PushTx(encodedTx string) (string, error) {
 
 	if tx.To() == nil {
 		addr := core.AddressFromMessage(tx)
-		return toHex(addr), nil
+		return common.ToHex(addr), nil
 	}
-	return toHex(tx.Hash()), nil
+	return common.ToHex(tx.Hash()), nil
 }
 
 var (
@@ -325,7 +325,7 @@ func (self *XEth) Call(fromStr, toStr, valueStr, gasStr, gasPriceStr, dataStr st
 	vmenv := core.NewEnv(statedb, self.chainManager, msg, block)
 
 	res, err := vmenv.Call(msg.from, msg.to, msg.data, msg.gas, msg.gasPrice, msg.value)
-	return toHex(res), err
+	return common.ToHex(res), err
 }
 
 func (self *XEth) Transact(fromStr, toStr, valueStr, gasStr, gasPriceStr, codeStr string) (string, error) {
@@ -371,9 +371,9 @@ func (self *XEth) Transact(fromStr, toStr, valueStr, gasStr, gasPriceStr, codeSt
 	}
 
 	if types.IsContractAddr(to) {
-		return toHex(core.AddressFromMessage(tx)), nil
+		return common.ToHex(core.AddressFromMessage(tx)), nil
 	}
-	return toHex(tx.Hash()), nil
+	return common.ToHex(tx.Hash()), nil
 }
 
 func (self *XEth) sign(tx *types.Transaction, from []byte, didUnlock bool) error {