diff --git a/cmd/ethereum/admin.go b/cmd/ethereum/admin.go
index 880a22c22..967af2553 100644
--- a/cmd/ethereum/admin.go
+++ b/cmd/ethereum/admin.go
@@ -8,8 +8,8 @@ import (
 	"time"
 
 	"github.com/ethereum/go-ethereum/cmd/utils"
-	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/ethereum/go-ethereum/state"
@@ -239,7 +239,7 @@ func (js *jsre) dumpBlock(call otto.FunctionCall) otto.Value {
 			block = js.ethereum.ChainManager().GetBlockByNumber(uint64(num))
 		} else if call.Argument(0).IsString() {
 			hash, _ := call.Argument(0).ToString()
-			block = js.ethereum.ChainManager().GetBlock(common.Hex2Bytes(hash))
+			block = js.ethereum.ChainManager().GetBlock(common.HexToHash(hash))
 		} else {
 			fmt.Println("invalid argument for dump. Either hex string or number")
 		}
diff --git a/cmd/ethereum/main.go b/cmd/ethereum/main.go
index 3b952dd79..459059e6c 100644
--- a/cmd/ethereum/main.go
+++ b/cmd/ethereum/main.go
@@ -302,7 +302,7 @@ func dump(ctx *cli.Context) {
 	for _, arg := range ctx.Args() {
 		var block *types.Block
 		if hashish(arg) {
-			block = chainmgr.GetBlock(common.Hex2Bytes(arg))
+			block = chainmgr.GetBlock(common.HexToHash(arg))
 		} else {
 			num, _ := strconv.Atoi(arg)
 			block = chainmgr.GetBlockByNumber(uint64(num))
diff --git a/core/state_transition.go b/core/state_transition.go
index 1509a5258..d0b2c5d7c 100644
--- a/core/state_transition.go
+++ b/core/state_transition.go
@@ -57,6 +57,12 @@ type Message interface {
 	Data() []byte
 }
 
+func AddressFromMessage(msg Message) common.Address {
+	from, _ := msg.From()
+
+	return crypto.CreateAddress(from, msg.Nonce())
+}
+
 func MessageCreatesContract(msg Message) bool {
 	return msg.To() == nil
 }
diff --git a/eth/backend.go b/eth/backend.go
index 18093008b..c26bdceb5 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -10,11 +10,11 @@ import (
 	"github.com/ethereum/ethash"
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/blockpool"
+	"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/logger"
 	"github.com/ethereum/go-ethereum/miner"
@@ -288,7 +288,7 @@ func (s *Ethereum) StartMining() error {
 		servlogger.Errorf("Cannot start mining without coinbase: %v\n", err)
 		return fmt.Errorf("no coinbase: %v", err)
 	}
-	s.miner.Start(cb)
+	s.miner.Start(common.BytesToAddress(cb))
 	return nil
 }
 
@@ -304,9 +304,9 @@ func (s *Ethereum) TxPool() *core.TxPool                 { return s.txPool }
 func (s *Ethereum) BlockPool() *blockpool.BlockPool      { return s.blockPool }
 func (s *Ethereum) Whisper() *whisper.Whisper            { return s.whisper }
 func (s *Ethereum) EventMux() *event.TypeMux             { return s.eventMux }
-func (s *Ethereum) BlockDb() common.Database            { return s.blockDb }
-func (s *Ethereum) StateDb() common.Database            { return s.stateDb }
-func (s *Ethereum) ExtraDb() common.Database            { return s.extraDb }
+func (s *Ethereum) BlockDb() common.Database             { return s.blockDb }
+func (s *Ethereum) StateDb() common.Database             { return s.stateDb }
+func (s *Ethereum) ExtraDb() common.Database             { return s.extraDb }
 func (s *Ethereum) IsListening() bool                    { return true } // Always listening
 func (s *Ethereum) PeerCount() int                       { return s.net.PeerCount() }
 func (s *Ethereum) PeerInfo() int                        { return s.net.PeerCount() }
diff --git a/eth/protocol.go b/eth/protocol.go
index e368bbec5..15a8e1831 100644
--- a/eth/protocol.go
+++ b/eth/protocol.go
@@ -1,13 +1,12 @@
 package eth
 
 import (
-	"bytes"
 	"fmt"
 	"math/big"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/errs"
-	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/p2p"
 	"github.com/ethereum/go-ethereum/rlp"
@@ -76,15 +75,15 @@ type txPool interface {
 }
 
 type chainManager interface {
-	GetBlockHashesFromHash(hash []byte, amount uint64) (hashes [][]byte)
-	GetBlock(hash []byte) (block *types.Block)
-	Status() (td *big.Int, currentBlock []byte, genesisBlock []byte)
+	GetBlockHashesFromHash(hash common.Hash, amount uint64) (hashes []common.Hash)
+	GetBlock(hash common.Hash) (block *types.Block)
+	Status() (td *big.Int, currentBlock common.Hash, genesisBlock common.Hash)
 }
 
 type blockPool interface {
-	AddBlockHashes(next func() ([]byte, bool), peerId string)
+	AddBlockHashes(next func() (common.Hash, bool), peerId string)
 	AddBlock(block *types.Block, peerId string)
-	AddPeer(td *big.Int, currentBlock []byte, peerId string, requestHashes func([]byte) error, requestBlocks func([][]byte) error, peerError func(*errs.Error)) (best bool)
+	AddPeer(td *big.Int, currentBlock common.Hash, peerId string, requestHashes func(common.Hash) error, requestBlocks func([]common.Hash) error, peerError func(*errs.Error)) (best bool)
 	RemovePeer(peerId string)
 }
 
@@ -95,7 +94,7 @@ type newBlockMsgData struct {
 }
 
 type getBlockHashesMsgData struct {
-	Hash   []byte
+	Hash   common.Hash
 	Amount uint64
 }
 
@@ -167,7 +166,7 @@ func (self *ethProtocol) handle() error {
 		}
 		for _, tx := range txs {
 			jsonlogger.LogJson(&logger.EthTxReceived{
-				TxHash:   common.Bytes2Hex(tx.Hash()),
+				TxHash:   tx.Hash().Hex(),
 				RemoteId: self.peer.ID().String(),
 			})
 		}
@@ -183,7 +182,7 @@ func (self *ethProtocol) handle() error {
 			request.Amount = maxHashes
 		}
 		hashes := self.chainManager.GetBlockHashesFromHash(request.Hash, request.Amount)
-		return p2p.EncodeMsg(self.rw, BlockHashesMsg, common.ByteSliceToInterface(hashes)...)
+		return p2p.EncodeMsg(self.rw, BlockHashesMsg, rlp.Flat(hashes))
 
 	case BlockHashesMsg:
 		msgStream := rlp.NewStream(msg.Payload)
@@ -192,14 +191,16 @@ func (self *ethProtocol) handle() error {
 		}
 
 		var i int
-		iter := func() (hash []byte, ok bool) {
-			hash, err := msgStream.Bytes()
+		iter := func() (hash common.Hash, ok bool) {
+			var h common.Hash
+			err := msgStream.Decode(&h)
 			if err == rlp.EOL {
-				return nil, false
+				return common.Hash{}, false
 			} else if err != nil {
 				self.protoError(ErrDecode, "msg %v: after %v hashes : %v", msg, i, err)
-				return nil, false
+				return common.Hash{}, false
 			}
+
 			i++
 			return hash, true
 		}
@@ -215,14 +216,14 @@ func (self *ethProtocol) handle() error {
 		var i int
 		for {
 			i++
-			var hash []byte
-			if err := msgStream.Decode(&hash); err != nil {
-				if err == rlp.EOL {
-					break
-				} else {
-					return self.protoError(ErrDecode, "msg %v: %v", msg, err)
-				}
+			var hash common.Hash
+			err := msgStream.Decode(&hash)
+			if err == rlp.EOL {
+				break
+			} else {
+				return self.protoError(ErrDecode, "msg %v: %v", msg, err)
 			}
+
 			block := self.chainManager.GetBlock(hash)
 			if block != nil {
 				blocks = append(blocks, block)
@@ -259,10 +260,10 @@ func (self *ethProtocol) handle() error {
 		_, chainHead, _ := self.chainManager.Status()
 
 		jsonlogger.LogJson(&logger.EthChainReceivedNewBlock{
-			BlockHash:     common.Bytes2Hex(hash),
+			BlockHash:     hash.Hex(),
 			BlockNumber:   request.Block.Number(), // this surely must be zero
-			ChainHeadHash: common.Bytes2Hex(chainHead),
-			BlockPrevHash: common.Bytes2Hex(request.Block.ParentHash()),
+			ChainHeadHash: chainHead.Hex(),
+			BlockPrevHash: request.Block.ParentHash().Hex(),
 			RemoteId:      self.peer.ID().String(),
 		})
 		// to simplify backend interface adding a new block
@@ -282,8 +283,8 @@ type statusMsgData struct {
 	ProtocolVersion uint32
 	NetworkId       uint32
 	TD              *big.Int
-	CurrentBlock    []byte
-	GenesisBlock    []byte
+	CurrentBlock    common.Hash
+	GenesisBlock    common.Hash
 }
 
 func (self *ethProtocol) statusMsg() p2p.Msg {
@@ -325,7 +326,7 @@ func (self *ethProtocol) handleStatus() error {
 
 	_, _, genesisBlock := self.chainManager.Status()
 
-	if !bytes.Equal(status.GenesisBlock, genesisBlock) {
+	if status.GenesisBlock != genesisBlock {
 		return self.protoError(ErrGenesisBlockMismatch, "%x (!= %x)", status.GenesisBlock, genesisBlock)
 	}
 
@@ -344,14 +345,14 @@ func (self *ethProtocol) handleStatus() error {
 	return nil
 }
 
-func (self *ethProtocol) requestBlockHashes(from []byte) error {
+func (self *ethProtocol) requestBlockHashes(from common.Hash) error {
 	self.peer.Debugf("fetching hashes (%d) %x...\n", maxHashes, from[0:4])
 	return p2p.EncodeMsg(self.rw, GetBlockHashesMsg, interface{}(from), uint64(maxHashes))
 }
 
-func (self *ethProtocol) requestBlocks(hashes [][]byte) error {
+func (self *ethProtocol) requestBlocks(hashes []common.Hash) error {
 	self.peer.Debugf("fetching %v blocks", len(hashes))
-	return p2p.EncodeMsg(self.rw, GetBlocksMsg, common.ByteSliceToInterface(hashes)...)
+	return p2p.EncodeMsg(self.rw, GetBlocksMsg, rlp.Flat(hashes))
 }
 
 func (self *ethProtocol) protoError(code int, format string, params ...interface{}) (err *errs.Error) {
diff --git a/miner/miner.go b/miner/miner.go
index 7bf67a6ec..ccc19c754 100644
--- a/miner/miner.go
+++ b/miner/miner.go
@@ -4,6 +4,7 @@ import (
 	"math/big"
 
 	"github.com/ethereum/ethash"
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/pow"
@@ -32,7 +33,7 @@ func (self *Miner) Mining() bool {
 	return self.mining
 }
 
-func (self *Miner) Start(coinbase []byte) {
+func (self *Miner) Start(coinbase common.Address) {
 	self.mining = true
 	self.worker = newWorker(coinbase, self.eth)
 	self.worker.register(NewCpuMiner(0, self.pow))
diff --git a/miner/worker.go b/miner/worker.go
index 10fc6f508..63d1bfa0b 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -7,9 +7,9 @@ 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/common"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/pow"
@@ -39,7 +39,7 @@ func env(block *types.Block, eth core.Backend) *environment {
 		coinbase:     state.GetOrNewStateObject(block.Coinbase()),
 	}
 	for _, ancestor := range eth.ChainManager().GetAncestors(block, 7) {
-		env.ancestors.Add(string(ancestor.Hash()))
+		env.ancestors.Add(ancestor.Hash())
 	}
 
 	return env
@@ -71,14 +71,14 @@ type worker struct {
 	eth      core.Backend
 	chain    *core.ChainManager
 	proc     *core.BlockProcessor
-	coinbase []byte
+	coinbase common.Address
 
 	current *environment
 
 	mining bool
 }
 
-func newWorker(coinbase []byte, eth core.Backend) *worker {
+func newWorker(coinbase common.Address, eth core.Backend) *worker {
 	return &worker{
 		eth:      eth,
 		mux:      eth.EventMux(),
@@ -152,13 +152,13 @@ func (self *worker) wait() {
 			block := self.current.block
 			if block.Number().Uint64() == work.Number && block.Nonce() == 0 {
 				self.current.block.SetNonce(work.Nonce)
-				self.current.block.Header().MixDigest = work.MixDigest
+				self.current.block.Header().MixDigest = common.BytesToHash(work.MixDigest)
 
 				jsonlogger.LogJson(&logger.EthMinerNewBlock{
-					BlockHash:     common.Bytes2Hex(block.Hash()),
+					BlockHash:     block.Hash().Hex(),
 					BlockNumber:   block.Number(),
-					ChainHeadHash: common.Bytes2Hex(block.ParentHeaderHash),
-					BlockPrevHash: common.Bytes2Hex(block.ParentHeaderHash),
+					ChainHeadHash: block.ParentHeaderHash.Hex(),
+					BlockPrevHash: block.ParentHeaderHash.Hex(),
 				})
 
 				if err := self.chain.InsertChain(types.Blocks{self.current.block}); err == nil {
@@ -208,9 +208,10 @@ gasLimit:
 			fallthrough
 		case core.IsInvalidTxErr(err):
 			// Remove invalid transactions
-			self.chain.TxState().RemoveNonce(tx.From(), tx.Nonce())
+			from, _ := tx.From()
+			self.chain.TxState().RemoveNonce(from, tx.Nonce())
 			remove = append(remove, tx)
-			minerlogger.Infof("TX (%x) failed. Transaction will be removed\n", tx.Hash()[:4])
+			minerlogger.Infof("TX (%x) failed. Transaction will be removed\n", tx.Hash().Bytes()[:4])
 		case state.IsGasLimitErr(err):
 			minerlogger.Infof("Gas limit reached for block. %d TXs included in this block\n", i)
 			// Break on gas limit
@@ -232,13 +233,13 @@ var (
 )
 
 func (self *worker) commitUncle(uncle *types.Header) error {
-	if self.current.uncles.Has(string(uncle.Hash())) {
+	if self.current.uncles.Has(uncle.Hash()) {
 		// Error not unique
 		return core.UncleError("Uncle not unique")
 	}
-	self.current.uncles.Add(string(uncle.Hash()))
+	self.current.uncles.Add(uncle.Hash())
 
-	if !self.current.ancestors.Has(string(uncle.ParentHash)) {
+	if !self.current.ancestors.Has(uncle.ParentHash) {
 		return core.UncleError(fmt.Sprintf("Uncle's parent unknown (%x)", uncle.ParentHash[0:4]))
 	}
 
diff --git a/rpc/api.go b/rpc/api.go
index 079347192..3c46684d1 100644
--- a/rpc/api.go
+++ b/rpc/api.go
@@ -668,7 +668,7 @@ 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(v.Uncles[args.Index].Hex(), false)
 		if err != nil {
 			return err
 		}
@@ -687,7 +687,7 @@ 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(v.Uncles[args.Index].Hex(), false)
 		if err != nil {
 			return err
 		}
@@ -832,12 +832,12 @@ func toFilterOptions(options *FilterOptions) core.FilterOptions {
 
 	// Convert optional address slice/string to byte slice
 	if str, ok := options.Address.(string); ok {
-		opts.Address = [][]byte{common.FromHex(str)}
+		opts.Address = []common.Address{common.HexToAddress(str)}
 	} else if slice, ok := options.Address.([]interface{}); ok {
-		bslice := make([][]byte, len(slice))
+		bslice := make([]common.Address, len(slice))
 		for i, addr := range slice {
 			if saddr, ok := addr.(string); ok {
-				bslice[i] = common.FromHex(saddr)
+				bslice[i] = common.HexToAddress(saddr)
 			}
 		}
 		opts.Address = bslice
@@ -846,16 +846,15 @@ func toFilterOptions(options *FilterOptions) core.FilterOptions {
 	opts.Earliest = options.Earliest
 	opts.Latest = options.Latest
 
-	topics := make([][][]byte, len(options.Topics))
+	topics := make([][]common.Hash, len(options.Topics))
 	for i, topicDat := range options.Topics {
 		if slice, ok := topicDat.([]interface{}); ok {
-			topics[i] = make([][]byte, len(slice))
+			topics[i] = make([]common.Hash, len(slice))
 			for j, topic := range slice {
-				topics[i][j] = common.FromHex(topic.(string))
+				topics[i][j] = common.HexToHash(topic.(string))
 			}
 		} else if str, ok := topicDat.(string); ok {
-			topics[i] = make([][]byte, 1)
-			topics[i][0] = common.FromHex(str)
+			topics[i] = []common.Hash{common.HexToHash(str)}
 		}
 	}
 	opts.Topics = topics
diff --git a/rpc/responses.go b/rpc/responses.go
index f41ce7b96..5b2b9d488 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"
 )
 
@@ -12,14 +13,14 @@ type BlockRes struct {
 	fullTx bool
 
 	BlockNumber     int64             `json:"number"`
-	BlockHash       []byte            `json:"hash"`
-	ParentHash      []byte            `json:"parentHash"`
-	Nonce           []byte            `json:"nonce"`
-	Sha3Uncles      []byte            `json:"sha3Uncles"`
-	LogsBloom       []byte            `json:"logsBloom"`
-	TransactionRoot []byte            `json:"transactionRoot"`
-	StateRoot       []byte            `json:"stateRoot"`
-	Miner           []byte            `json:"miner"`
+	BlockHash       common.Hash       `json:"hash"`
+	ParentHash      common.Hash       `json:"parentHash"`
+	Nonce           [8]byte           `json:"nonce"`
+	Sha3Uncles      common.Hash       `json:"sha3Uncles"`
+	LogsBloom       types.Bloom       `json:"logsBloom"`
+	TransactionRoot common.Hash       `json:"transactionRoot"`
+	StateRoot       common.Hash       `json:"stateRoot"`
+	Miner           common.Address    `json:"miner"`
 	Difficulty      int64             `json:"difficulty"`
 	TotalDifficulty int64             `json:"totalDifficulty"`
 	Size            int64             `json:"size"`
@@ -29,7 +30,7 @@ type BlockRes struct {
 	GasUsed         int64             `json:"gasUsed"`
 	UnixTimestamp   int64             `json:"timestamp"`
 	Transactions    []*TransactionRes `json:"transactions"`
-	Uncles          [][]byte          `json:"uncles"`
+	Uncles          []common.Hash     `json:"uncles"`
 }
 
 func (b *BlockRes) MarshalJSON() ([]byte, error) {
@@ -57,14 +58,14 @@ 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.BlockHash = b.BlockHash.Hex()
+	ext.ParentHash = b.ParentHash.Hex()
+	ext.Nonce = toHex(b.Nonce[:])
+	ext.Sha3Uncles = b.Sha3Uncles.Hex()
+	ext.LogsBloom = toHex(b.LogsBloom[:])
+	ext.TransactionRoot = b.TransactionRoot.Hex()
+	ext.StateRoot = b.StateRoot.Hex()
+	ext.Miner = b.Miner.Hex()
 	ext.Difficulty = toHex(big.NewInt(b.Difficulty).Bytes())
 	ext.TotalDifficulty = toHex(big.NewInt(b.TotalDifficulty).Bytes())
 	ext.Size = toHex(big.NewInt(b.Size).Bytes())
@@ -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] = tx.Hash.Hex()
 		}
 	}
 	ext.Uncles = make([]string, len(b.Uncles))
 	for i, v := range b.Uncles {
-		ext.Uncles[i] = toHex(v)
+		ext.Uncles[i] = v.Hex()
 	}
 
 	return json.Marshal(ext)
@@ -124,7 +125,7 @@ func NewBlockRes(block *types.Block) *BlockRes {
 		v.TxIndex = int64(i)
 		res.Transactions[i] = v
 	}
-	res.Uncles = make([][]byte, len(block.Uncles()))
+	res.Uncles = make([]common.Hash, len(block.Uncles()))
 	for i, uncle := range block.Uncles() {
 		res.Uncles[i] = uncle.Hash()
 	}
@@ -132,17 +133,17 @@ func NewBlockRes(block *types.Block) *BlockRes {
 }
 
 type TransactionRes struct {
-	Hash        []byte `json:"hash"`
-	Nonce       int64  `json:"nonce"`
-	BlockHash   []byte `json:"blockHash,omitempty"`
-	BlockNumber int64  `json:"blockNumber,omitempty"`
-	TxIndex     int64  `json:"transactionIndex,omitempty"`
-	From        []byte `json:"from"`
-	To          []byte `json:"to"`
-	Value       int64  `json:"value"`
-	Gas         int64  `json:"gas"`
-	GasPrice    int64  `json:"gasPrice"`
-	Input       []byte `json:"input"`
+	Hash        common.Hash     `json:"hash"`
+	Nonce       int64           `json:"nonce"`
+	BlockHash   common.Hash     `json:"blockHash,omitempty"`
+	BlockNumber int64           `json:"blockNumber,omitempty"`
+	TxIndex     int64           `json:"transactionIndex,omitempty"`
+	From        common.Address  `json:"from"`
+	To          *common.Address `json:"to"`
+	Value       int64           `json:"value"`
+	Gas         int64           `json:"gas"`
+	GasPrice    int64           `json:"gasPrice"`
+	Input       []byte          `json:"input"`
 }
 
 func (t *TransactionRes) MarshalJSON() ([]byte, error) {
@@ -160,13 +161,17 @@ func (t *TransactionRes) MarshalJSON() ([]byte, error) {
 		Input       string `json:"input"`
 	}
 
-	ext.Hash = toHex(t.Hash)
+	ext.Hash = t.Hash.Hex()
 	ext.Nonce = toHex(big.NewInt(t.Nonce).Bytes())
-	ext.BlockHash = toHex(t.BlockHash)
+	ext.BlockHash = t.BlockHash.Hex()
 	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.From = t.From.Hex()
+	if t.To == nil {
+		ext.To = "0x00"
+	} else {
+		ext.To = t.To.Hex()
+	}
 	ext.Value = toHex(big.NewInt(t.Value).Bytes())
 	ext.Gas = toHex(big.NewInt(t.Gas).Bytes())
 	ext.GasPrice = toHex(big.NewInt(t.GasPrice).Bytes())
@@ -179,7 +184,7 @@ func NewTransactionRes(tx *types.Transaction) *TransactionRes {
 	var v = new(TransactionRes)
 	v.Hash = tx.Hash()
 	v.Nonce = int64(tx.Nonce())
-	v.From = tx.From()
+	v.From, _ = tx.From()
 	v.To = tx.To()
 	v.Value = tx.Value().Int64()
 	v.Gas = tx.Gas().Int64()
diff --git a/rpc/util.go b/rpc/util.go
index e5610dc2c..b9b0fa442 100644
--- a/rpc/util.go
+++ b/rpc/util.go
@@ -155,11 +155,11 @@ 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.Address = log.Address().Hex()
 		l.Data = toHex(log.Data())
 		l.Number = log.Number()
 		for j, topic := range log.Topics() {
-			l.Topic[j] = toHex(topic)
+			l.Topic[j] = topic.Hex()
 		}
 		ls[i] = l
 	}
diff --git a/xeth/types.go b/xeth/types.go
index d6d2a11f7..d8d6ff19f 100644
--- a/xeth/types.go
+++ b/xeth/types.go
@@ -142,9 +142,9 @@ func NewTx(tx *types.Transaction) *Transaction {
 	hash := tx.Hash().Hex()
 	receiver := tx.To().Hex()
 	if len(receiver) == 0 {
-		receiver = toHex(core.AddressFromMessage(tx))
+		receiver = core.AddressFromMessage(tx).Hex()
 	}
-	sender := toHex(tx.From())
+	sender, _ := tx.From()
 	createsContract := core.MessageCreatesContract(tx)
 
 	var data string
@@ -154,7 +154,7 @@ func NewTx(tx *types.Transaction) *Transaction {
 		data = 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.Hex(), CreatesContract: createsContract, RawData: toHex(tx.Data())}
 }
 
 func (self *Transaction) ToString() string {
diff --git a/xeth/xeth.go b/xeth/xeth.go
index 6c7a26c04..672b83332 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"
@@ -116,14 +116,14 @@ func (self *XEth) State() *State { return self.state }
 func (self *XEth) Whisper() *Whisper { return self.whisper }
 
 func (self *XEth) BlockByHash(strHash string) *Block {
-	hash := common.FromHex(strHash)
+	hash := common.HexToHash(strHash)
 	block := self.chainManager.GetBlock(hash)
 
 	return NewBlock(block)
 }
 
 func (self *XEth) EthBlockByHash(strHash string) *types.Block {
-	hash := common.FromHex(strHash)
+	hash := common.HexToHash(strHash)
 	block := self.chainManager.GetBlock(hash)
 
 	return block
@@ -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 addr.Hex(), nil
 	}
-	return toHex(tx.Hash()), nil
+	return tx.Hash().Hex(), nil
 }
 
 var (
@@ -306,8 +306,8 @@ var (
 func (self *XEth) Call(fromStr, toStr, valueStr, gasStr, gasPriceStr, dataStr string) (string, error) {
 	statedb := self.State().State() //self.chainManager.TransState()
 	msg := callmsg{
-		from:     statedb.GetOrNewStateObject(common.FromHex(fromStr)),
-		to:       common.FromHex(toStr),
+		from:     statedb.GetOrNewStateObject(common.HexToAddress(fromStr)),
+		to:       common.HexToAddress(toStr),
 		gas:      common.Big(gasStr),
 		gasPrice: common.Big(gasPriceStr),
 		value:    common.Big(valueStr),
@@ -330,8 +330,8 @@ func (self *XEth) Call(fromStr, toStr, valueStr, gasStr, gasPriceStr, dataStr st
 
 func (self *XEth) Transact(fromStr, toStr, valueStr, gasStr, gasPriceStr, codeStr string) (string, error) {
 	var (
-		from             []byte
-		to               []byte
+		from             = common.HexToAddress(fromStr)
+		to               = common.HexToAddress(toStr)
 		value            = common.NewValue(valueStr)
 		gas              = common.NewValue(gasStr)
 		price            = common.NewValue(gasPriceStr)
@@ -339,10 +339,8 @@ func (self *XEth) Transact(fromStr, toStr, valueStr, gasStr, gasPriceStr, codeSt
 		contractCreation bool
 	)
 
-	from = common.FromHex(fromStr)
 	data = common.FromHex(codeStr)
-	to = common.FromHex(toStr)
-	if len(to) == 0 {
+	if len(toStr) == 0 {
 		contractCreation = true
 	}
 
@@ -368,21 +366,19 @@ func (self *XEth) Transact(fromStr, toStr, valueStr, gasStr, gasPriceStr, codeSt
 	if contractCreation {
 		addr := core.AddressFromMessage(tx)
 		pipelogger.Infof("Contract addr %x\n", addr)
-	}
 
-	if types.IsContractAddr(to) {
-		return toHex(core.AddressFromMessage(tx)), nil
+		return core.AddressFromMessage(tx).Hex(), nil
 	}
-	return toHex(tx.Hash()), nil
+	return tx.Hash().Hex(), nil
 }
 
-func (self *XEth) sign(tx *types.Transaction, from []byte, didUnlock bool) error {
-	sig, err := self.accountManager.Sign(accounts.Account{Address: from}, tx.Hash())
+func (self *XEth) sign(tx *types.Transaction, from common.Address, didUnlock bool) error {
+	sig, err := self.accountManager.Sign(accounts.Account{Address: from.Bytes()}, tx.Hash().Bytes())
 	if err == accounts.ErrLocked {
 		if didUnlock {
 			return fmt.Errorf("sender account still locked after successful unlock")
 		}
-		if !self.frontend.UnlockAccount(from) {
+		if !self.frontend.UnlockAccount(from.Bytes()) {
 			return fmt.Errorf("could not unlock sender account")
 		}
 		// retry signing, the account should now be unlocked.
@@ -397,17 +393,17 @@ func (self *XEth) sign(tx *types.Transaction, from []byte, didUnlock bool) error
 // callmsg is the message type used for call transations.
 type callmsg struct {
 	from          *state.StateObject
-	to            []byte
+	to            common.Address
 	gas, gasPrice *big.Int
 	value         *big.Int
 	data          []byte
 }
 
 // accessor boilerplate to implement core.Message
-func (m callmsg) From() []byte       { return m.from.Address() }
-func (m callmsg) Nonce() uint64      { return m.from.Nonce() }
-func (m callmsg) To() []byte         { return m.to }
-func (m callmsg) GasPrice() *big.Int { return m.gasPrice }
-func (m callmsg) Gas() *big.Int      { return m.gas }
-func (m callmsg) Value() *big.Int    { return m.value }
-func (m callmsg) Data() []byte       { return m.data }
+func (m callmsg) From() (common.Address, error) { return m.from.Address(), nil }
+func (m callmsg) Nonce() uint64                 { return m.from.Nonce() }
+func (m callmsg) To() *common.Address           { return &m.to }
+func (m callmsg) GasPrice() *big.Int            { return m.gasPrice }
+func (m callmsg) Gas() *big.Int                 { return m.gas }
+func (m callmsg) Value() *big.Int               { return m.value }
+func (m callmsg) Data() []byte                  { return m.data }