diff --git a/core/execution.go b/core/execution.go
index be45eeeb46324c50e100309dedbb5fba63e9f077..4f15fb42a91bb161aad53c2bb3d3f5af6aac201e 100644
--- a/core/execution.go
+++ b/core/execution.go
@@ -4,6 +4,7 @@ import (
 	"math/big"
 	"time"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/state"
 	"github.com/ethereum/go-ethereum/vm"
@@ -11,26 +12,23 @@ import (
 
 type Execution struct {
 	env               vm.Environment
-	address, input    []byte
+	address           *common.Address
+	input             []byte
 	Gas, price, value *big.Int
 }
 
-func NewExecution(env vm.Environment, address, input []byte, gas, gasPrice, value *big.Int) *Execution {
+func NewExecution(env vm.Environment, address *common.Address, input []byte, gas, gasPrice, value *big.Int) *Execution {
 	return &Execution{env: env, address: address, input: input, Gas: gas, price: gasPrice, value: value}
 }
 
-func (self *Execution) Addr() []byte {
-	return self.address
-}
-
-func (self *Execution) Call(codeAddr []byte, caller vm.ContextRef) ([]byte, error) {
+func (self *Execution) Call(codeAddr common.Address, caller vm.ContextRef) ([]byte, error) {
 	// Retrieve the executing code
 	code := self.env.State().GetCode(codeAddr)
 
-	return self.exec(code, codeAddr, caller)
+	return self.exec(&codeAddr, code, caller)
 }
 
-func (self *Execution) exec(code, contextAddr []byte, caller vm.ContextRef) (ret []byte, err error) {
+func (self *Execution) exec(contextAddr *common.Address, code []byte, caller vm.ContextRef) (ret []byte, err error) {
 	env := self.env
 	evm := vm.NewVm(env)
 	if env.Depth() == vm.MaxCallDepth {
@@ -40,14 +38,15 @@ func (self *Execution) exec(code, contextAddr []byte, caller vm.ContextRef) (ret
 	}
 
 	vsnapshot := env.State().Copy()
-	if len(self.address) == 0 {
+	if self.address == nil {
 		// Generate a new address
 		nonce := env.State().GetNonce(caller.Address())
-		self.address = crypto.CreateAddress(caller.Address(), nonce)
+		addr := crypto.CreateAddress(caller.Address(), nonce)
+		self.address = &addr
 		env.State().SetNonce(caller.Address(), nonce+1)
 	}
 
-	from, to := env.State().GetStateObject(caller.Address()), env.State().GetOrNewStateObject(self.address)
+	from, to := env.State().GetStateObject(caller.Address()), env.State().GetOrNewStateObject(*self.address)
 	err = env.Transfer(from, to, self.value)
 	if err != nil {
 		env.State().Set(vsnapshot)
@@ -73,8 +72,8 @@ func (self *Execution) exec(code, contextAddr []byte, caller vm.ContextRef) (ret
 }
 
 func (self *Execution) Create(caller vm.ContextRef) (ret []byte, err error, account *state.StateObject) {
-	ret, err = self.exec(self.input, nil, caller)
-	account = self.env.State().GetStateObject(self.address)
+	ret, err = self.exec(nil, self.input, caller)
+	account = self.env.State().GetStateObject(*self.address)
 
 	return
 }
diff --git a/core/filter.go b/core/filter.go
index d58aa8d7cb1968032ceac212ee2680d0c2e85476..e08aac1202ea0d2e9b8f0901cf0e0f3014810a3f 100644
--- a/core/filter.go
+++ b/core/filter.go
@@ -1,9 +1,9 @@
 package core
 
 import (
-	"bytes"
 	"math"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/state"
 )
@@ -16,8 +16,8 @@ type FilterOptions struct {
 	Earliest int64
 	Latest   int64
 
-	Address [][]byte
-	Topics  [][][]byte
+	Address []common.Address
+	Topics  [][]common.Hash
 
 	Skip int
 	Max  int
@@ -29,9 +29,9 @@ type Filter struct {
 	earliest int64
 	latest   int64
 	skip     int
-	address  [][]byte
+	address  []common.Address
 	max      int
-	topics   [][][]byte
+	topics   [][]common.Hash
 
 	BlockCallback   func(*types.Block)
 	PendingCallback func(*types.Block)
@@ -67,11 +67,11 @@ func (self *Filter) SetLatestBlock(latest int64) {
 	self.latest = latest
 }
 
-func (self *Filter) SetAddress(addr [][]byte) {
+func (self *Filter) SetAddress(addr []common.Address) {
 	self.address = addr
 }
 
-func (self *Filter) SetTopics(topics [][][]byte) {
+func (self *Filter) SetTopics(topics [][]common.Hash) {
 	self.topics = topics
 }
 
@@ -131,9 +131,9 @@ func (self *Filter) Find() state.Logs {
 	return logs[skip:]
 }
 
-func includes(addresses [][]byte, a []byte) bool {
+func includes(addresses []common.Address, a common.Address) bool {
 	for _, addr := range addresses {
-		if !bytes.Equal(addr, a) {
+		if addr != a {
 			return false
 		}
 	}
@@ -151,13 +151,13 @@ Logs:
 			continue
 		}
 
-		logTopics := make([][]byte, len(self.topics))
+		logTopics := make([]common.Hash, len(self.topics))
 		copy(logTopics, log.Topics())
 
 		for i, topics := range self.topics {
 			for _, topic := range topics {
 				var match bool
-				if bytes.Equal(log.Topics()[i], topic) {
+				if log.Topics()[i] == topic {
 					match = true
 				}
 				if !match {
@@ -176,7 +176,7 @@ func (self *Filter) bloomFilter(block *types.Block) bool {
 	if len(self.address) > 0 {
 		var included bool
 		for _, addr := range self.address {
-			if types.BloomLookup(block.Bloom(), addr) {
+			if types.BloomLookup(block.Bloom(), addr.Hash()) {
 				included = true
 				break
 			}
diff --git a/core/genesis.go b/core/genesis.go
index bfd51f196f01f428b23062edd06aba063f5aad5a..70845b502a6adca47d504f34454b39d7e885a831 100644
--- a/core/genesis.go
+++ b/core/genesis.go
@@ -6,9 +6,9 @@ import (
 	"math/big"
 	"os"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
-	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/state"
 )
 
@@ -26,12 +26,11 @@ var GenesisDiff = big.NewInt(131072)
 var GenesisGasLimit = big.NewInt(3141592)
 
 func GenesisBlock(db common.Database) *types.Block {
-	genesis := types.NewBlock(ZeroHash256, ZeroHash160, nil, GenesisDiff, 42, "")
+	genesis := types.NewBlock(common.Hash{}, common.Address{}, common.Hash{}, GenesisDiff, 42, "")
 	genesis.Header().Number = common.Big0
 	genesis.Header().GasLimit = GenesisGasLimit
 	genesis.Header().GasUsed = common.Big0
 	genesis.Header().Time = 0
-	genesis.Header().MixDigest = make([]byte, 32)
 
 	genesis.Td = common.Big0
 
@@ -49,7 +48,7 @@ func GenesisBlock(db common.Database) *types.Block {
 	statedb := state.New(genesis.Root(), db)
 	for addr, account := range accounts {
 		codedAddr := common.Hex2Bytes(addr)
-		accountState := statedb.GetAccount(codedAddr)
+		accountState := statedb.GetAccount(common.BytesToAddress(codedAddr))
 		accountState.SetBalance(common.Big(account.Balance))
 		statedb.UpdateStateObject(accountState)
 	}
diff --git a/core/state_transition.go b/core/state_transition.go
index ef822e86c764dbfe88509365d748d375e3c14f26..29de501b0a10c78f4aecdcecbaa847c11974a0a4 100644
--- a/core/state_transition.go
+++ b/core/state_transition.go
@@ -31,7 +31,7 @@ var ()
  * 6) Derive new state root
  */
 type StateTransition struct {
-	coinbase      []byte
+	coinbase      common.Address
 	msg           Message
 	gas, gasPrice *big.Int
 	initialGas    *big.Int
@@ -120,7 +120,7 @@ func (self *StateTransition) BuyGas() error {
 
 	sender := self.From()
 	if sender.Balance().Cmp(MessageGasValue(self.msg)) < 0 {
-		return fmt.Errorf("insufficient ETH for gas (%x). Req %v, has %v", sender.Address()[:4], MessageGasValue(self.msg), sender.Balance())
+		return fmt.Errorf("insufficient ETH for gas (%x). Req %v, has %v", sender.Address().Bytes()[:4], MessageGasValue(self.msg), sender.Balance())
 	}
 
 	coinbase := self.Coinbase()
@@ -196,8 +196,9 @@ func (self *StateTransition) transitionState() (ret []byte, usedGas *big.Int, er
 	vmenv := self.env
 	var ref vm.ContextRef
 	if MessageCreatesContract(msg) {
-		contract := makeContract(msg, self.state)
-		ret, err, ref = vmenv.Create(sender, contract.Address(), self.msg.Data(), self.gas, self.gasPrice, self.value)
+		//contract := makeContract(msg, self.state)
+		//addr := contract.Address()
+		ret, err, ref = vmenv.Create(sender, self.msg.Data(), self.gas, self.gasPrice, self.value)
 		if err == nil {
 			dataGas := big.NewInt(int64(len(ret)))
 			dataGas.Mul(dataGas, vm.GasCreateByte)
@@ -231,7 +232,7 @@ func (self *StateTransition) refundGas() {
 	for addr, ref := range self.state.Refunds() {
 		refund := common.BigMin(uhalf, ref)
 		self.gas.Add(self.gas, refund)
-		self.state.AddBalance([]byte(addr), refund.Mul(refund, self.msg.GasPrice()))
+		self.state.AddBalance(common.StringToAddress(addr), refund.Mul(refund, self.msg.GasPrice()))
 	}
 
 	coinbase.RefundGas(self.gas, self.msg.GasPrice())
@@ -243,10 +244,13 @@ func (self *StateTransition) gasUsed() *big.Int {
 
 // Converts an message in to a state object
 func makeContract(msg Message, state *state.StateDB) *state.StateObject {
-	addr := AddressFromMessage(msg)
+	/*
+		addr := AddressFromMessage(msg)
 
-	contract := state.GetOrNewStateObject(addr)
-	contract.SetInitCode(msg.Data())
+		contract := state.GetOrNewStateObject(addr)
+		contract.SetInitCode(msg.Data())
 
-	return contract
+		return contract
+	*/
+	return nil
 }
diff --git a/core/types/bloom9.go b/core/types/bloom9.go
index b3cab86a0b211963b1fa1446572dcb060a6add3c..55bfe2756855364fc9754a67ea868a7b52aa73d6 100644
--- a/core/types/bloom9.go
+++ b/core/types/bloom9.go
@@ -47,9 +47,9 @@ func bloom9(b []byte) *big.Int {
 	return r
 }
 
-func BloomLookup(bin, topic []byte) bool {
-	bloom := common.BigD(bin)
-	cmp := bloom9(crypto.Sha3(topic))
+func BloomLookup(bin Bloom, topic common.Hash) bool {
+	bloom := bin.Big()
+	cmp := bloom9(crypto.Sha3(topic[:]))
 
 	return bloom.And(bloom, cmp).Cmp(cmp) == 0
 }
diff --git a/core/types/common.go b/core/types/common.go
index dd5dc00c8f0e44fd1e91a298693d7f9f5390f839..6c5ac06b1da8d32748be67ea526181f1e903fe9e 100644
--- a/core/types/common.go
+++ b/core/types/common.go
@@ -1,6 +1,10 @@
 package types
 
-import "math/big"
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+)
 
 type BlockProcessor interface {
 	Process(*Block) (*big.Int, error)
@@ -24,3 +28,7 @@ func (b *Bloom) SetBytes(d []byte) {
 		b[i] = b[i]
 	}
 }
+
+func (b Bloom) Big() *big.Int {
+	return common.Bytes2Big(b[:])
+}
diff --git a/core/vm_env.go b/core/vm_env.go
index 7a921d7e32f819373aa202e2b9311e31b1a173e2..fb4253f5b77847cae0154b9c4c147d9229e80968 100644
--- a/core/vm_env.go
+++ b/core/vm_env.go
@@ -28,24 +28,24 @@ func NewEnv(state *state.StateDB, chain *ChainManager, msg Message, block *types
 	}
 }
 
-func (self *VMEnv) Origin() common.Address { return self.msg.From() }
-func (self *VMEnv) BlockNumber() *big.Int  { return self.block.Number() }
-func (self *VMEnv) Coinbase() []byte       { return self.block.Coinbase() }
-func (self *VMEnv) Time() int64            { return self.block.Time() }
-func (self *VMEnv) Difficulty() *big.Int   { return self.block.Difficulty() }
-func (self *VMEnv) GasLimit() *big.Int     { return self.block.GasLimit() }
-func (self *VMEnv) Value() *big.Int        { return self.msg.Value() }
-func (self *VMEnv) State() *state.StateDB  { return self.state }
-func (self *VMEnv) Depth() int             { return self.depth }
-func (self *VMEnv) SetDepth(i int)         { self.depth = i }
-func (self *VMEnv) VmType() vm.Type        { return self.typ }
-func (self *VMEnv) SetVmType(t vm.Type)    { self.typ = t }
-func (self *VMEnv) GetHash(n uint64) []byte {
+func (self *VMEnv) Origin() common.Address   { return self.msg.From() }
+func (self *VMEnv) BlockNumber() *big.Int    { return self.block.Number() }
+func (self *VMEnv) Coinbase() common.Address { return self.block.Coinbase() }
+func (self *VMEnv) Time() int64              { return self.block.Time() }
+func (self *VMEnv) Difficulty() *big.Int     { return self.block.Difficulty() }
+func (self *VMEnv) GasLimit() *big.Int       { return self.block.GasLimit() }
+func (self *VMEnv) Value() *big.Int          { return self.msg.Value() }
+func (self *VMEnv) State() *state.StateDB    { return self.state }
+func (self *VMEnv) Depth() int               { return self.depth }
+func (self *VMEnv) SetDepth(i int)           { self.depth = i }
+func (self *VMEnv) VmType() vm.Type          { return self.typ }
+func (self *VMEnv) SetVmType(t vm.Type)      { self.typ = t }
+func (self *VMEnv) GetHash(n uint64) common.Hash {
 	if block := self.chain.GetBlockByNumber(n); block != nil {
 		return block.Hash()
 	}
 
-	return nil
+	return common.Hash{}
 }
 func (self *VMEnv) AddLog(log state.Log) {
 	self.state.AddLog(log)
@@ -54,20 +54,21 @@ func (self *VMEnv) Transfer(from, to vm.Account, amount *big.Int) error {
 	return vm.Transfer(from, to, amount)
 }
 
-func (self *VMEnv) vm(addr, data []byte, gas, price, value *big.Int) *Execution {
+func (self *VMEnv) vm(addr *common.Address, data []byte, gas, price, value *big.Int) *Execution {
 	return NewExecution(self, addr, data, gas, price, value)
 }
 
 func (self *VMEnv) Call(me vm.ContextRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
-	exe := self.vm(addr, data, gas, price, value)
+	exe := self.vm(&addr, data, gas, price, value)
 	return exe.Call(addr, me)
 }
 func (self *VMEnv) CallCode(me vm.ContextRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
-	exe := self.vm(me.Address(), data, gas, price, value)
+	maddr := me.Address()
+	exe := self.vm(&maddr, data, gas, price, value)
 	return exe.Call(addr, me)
 }
 
 func (self *VMEnv) Create(me vm.ContextRef, data []byte, gas, price, value *big.Int) ([]byte, error, vm.ContextRef) {
-	exe := self.vm(common.Address{}, data, gas, price, value)
+	exe := self.vm(nil, data, gas, price, value)
 	return exe.Create(me)
 }
diff --git a/crypto/crypto.go b/crypto/crypto.go
index ec2b41042f10791ffcc6bf65eb7e2e9ea718d9a3..c3d47b6293abcbfe872b7a16cac5de3f1a491176 100644
--- a/crypto/crypto.go
+++ b/crypto/crypto.go
@@ -20,6 +20,7 @@ import (
 	"github.com/ethereum/go-ethereum/crypto/ecies"
 	"github.com/ethereum/go-ethereum/crypto/secp256k1"
 	"github.com/ethereum/go-ethereum/crypto/sha3"
+	"github.com/ethereum/go-ethereum/rlp"
 	"golang.org/x/crypto/pbkdf2"
 	"golang.org/x/crypto/ripemd160"
 )
@@ -47,8 +48,10 @@ func Sha3Hash(data ...[]byte) (h common.Hash) {
 }
 
 // Creates an ethereum address given the bytes and the nonce
-func CreateAddress(b []byte, nonce uint64) []byte {
-	return Sha3(common.NewValue([]interface{}{b, nonce}).Encode())[12:]
+func CreateAddress(b common.Address, nonce uint64) common.Address {
+	data, _ := rlp.EncodeToBytes([]interface{}{b, nonce})
+	return common.BytesToAddress(Sha3(data)[12:])
+	//return Sha3(common.NewValue([]interface{}{b, nonce}).Encode())[12:]
 }
 
 func Sha256(data []byte) []byte {
diff --git a/vm/context.go b/vm/context.go
index 93a0102d4c2f9a13b745c87ea6d5bcb90f031dca..c846aad89da1e293e6d11d9702de6453f0fdc19c 100644
--- a/vm/context.go
+++ b/vm/context.go
@@ -18,7 +18,7 @@ type Context struct {
 	self   ContextRef
 
 	Code     []byte
-	CodeAddr common.Address
+	CodeAddr *common.Address
 
 	value, Gas, UsedGas, Price *big.Int
 
@@ -108,7 +108,7 @@ func (self *Context) SetCode(code []byte) {
 	self.Code = code
 }
 
-func (self *Context) SetCallCode(addr common.Address, code []byte) {
+func (self *Context) SetCallCode(addr *common.Address, code []byte) {
 	self.Code = code
 	self.CodeAddr = addr
 }
diff --git a/vm/environment.go b/vm/environment.go
index 9de2fd80a2f366dac0464c942bfec938532696a1..6976d6749bc30bdd243f74d418833c5acba15b8c 100644
--- a/vm/environment.go
+++ b/vm/environment.go
@@ -16,8 +16,8 @@ type Environment interface {
 
 	Origin() common.Address
 	BlockNumber() *big.Int
-	GetHash(n uint64) []byte
-	Coinbase() []byte
+	GetHash(n uint64) common.Hash
+	Coinbase() common.Address
 	Time() int64
 	Difficulty() *big.Int
 	GasLimit() *big.Int
@@ -38,7 +38,7 @@ type Account interface {
 	SubBalance(amount *big.Int)
 	AddBalance(amount *big.Int)
 	Balance() *big.Int
-	Address() []byte
+	Address() common.Address
 }
 
 // generic transfer method
diff --git a/vm/vm.go b/vm/vm.go
index 796a55ad3f9b25cafd52b37204dc49993e0f6ea2..706a3e10851ef436aceec3c9688d4a94e0a97cf5 100644
--- a/vm/vm.go
+++ b/vm/vm.go
@@ -58,8 +58,10 @@ func (self *Vm) Run(context *Context, callData []byte) (ret []byte, err error) {
 		}()
 	}
 
-	if p := Precompiled[context.CodeAddr.Str()]; p != nil {
-		return self.RunPrecompiled(p, callData, context)
+	if context.CodeAddr != nil {
+		if p := Precompiled[context.CodeAddr.Str()]; p != nil {
+			return self.RunPrecompiled(p, callData, context)
+		}
 	}
 
 	var (
@@ -500,7 +502,7 @@ func (self *Vm) Run(context *Context, callData []byte) (ret []byte, err error) {
 
 			n := new(big.Int).Sub(self.env.BlockNumber(), common.Big257)
 			if num.Cmp(n) > 0 && num.Cmp(self.env.BlockNumber()) < 0 {
-				stack.push(common.BigD(self.env.GetHash(num.Uint64())))
+				stack.push(self.env.GetHash(num.Uint64()).Big())
 			} else {
 				stack.push(common.Big0)
 			}
@@ -509,7 +511,7 @@ func (self *Vm) Run(context *Context, callData []byte) (ret []byte, err error) {
 		case COINBASE:
 			coinbase := self.env.Coinbase()
 
-			stack.push(common.BigD(coinbase))
+			stack.push(coinbase.Big())
 
 			self.Printf(" => 0x%x", coinbase)
 		case TIMESTAMP: