Merge branch 'release/0.3.0'

40 files changed, 1821 insertions, 845 deletions

diff --git a/LICENSE b/LICENSE
index 803f2ef4e..b77f7909a 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2013 Geff Obscura
+Copyright (c) 2013 Jeffrey Wilcke
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/ethchain/address.go b/ethchain/address.go
new file mode 100644
index 000000000..a228c7566
--- /dev/null
+++ b/ethchain/address.go
@@ -0,0 +1,60 @@
+package ethchain
+
+import (
+	"github.com/ethereum/eth-go/ethutil"
+	"math/big"
+)
+
+type Address struct {
+	Amount *big.Int
+	Nonce  uint64
+}
+
+func NewAddress(amount *big.Int) *Address {
+	return &Address{Amount: amount, Nonce: 0}
+}
+
+func NewAddressFromData(data []byte) *Address {
+	address := &Address{}
+	address.RlpDecode(data)
+
+	return address
+}
+
+func (a *Address) AddFee(fee *big.Int) {
+	a.Amount.Add(a.Amount, fee)
+}
+
+func (a *Address) RlpEncode() []byte {
+	return ethutil.Encode([]interface{}{a.Amount, a.Nonce})
+}
+
+func (a *Address) RlpDecode(data []byte) {
+	decoder := ethutil.NewValueFromBytes(data)
+
+	a.Amount = decoder.Get(0).BigInt()
+	a.Nonce = decoder.Get(1).Uint()
+}
+
+type AddrStateStore struct {
+	states map[string]*AddressState
+}
+
+func NewAddrStateStore() *AddrStateStore {
+	return &AddrStateStore{states: make(map[string]*AddressState)}
+}
+
+func (s *AddrStateStore) Add(addr []byte, account *Address) *AddressState {
+	state := &AddressState{Nonce: account.Nonce, Account: account}
+	s.states[string(addr)] = state
+	return state
+}
+
+func (s *AddrStateStore) Get(addr []byte) *AddressState {
+	return s.states[string(addr)]
+}
+
+type AddressState struct {
+	Nonce   uint64
+	Account *Address
+}
diff --git a/ethchain/address_test.go b/ethchain/address_test.go
new file mode 100644
index 000000000..161e1b251
--- /dev/null
+++ b/ethchain/address_test.go
@@ -0,0 +1,8 @@
+package ethchain
+
+import (
+	"testing"
+)
+
+func TestAddressState(t *testing.T) {
+}
diff --git a/ethchain/block.go b/ethchain/block.go
index 0678f64e2..7ca44a47d 100644
--- a/ethchain/block.go
+++ b/ethchain/block.go
@@ -46,6 +46,8 @@ type Block struct {
 	// List of transactions and/or contracts
 	transactions []*Transaction
 	TxSha        []byte
+
+	contractStates map[string]*ethutil.Trie
 }
 
 // New block takes a raw encoded string
@@ -79,14 +81,15 @@ func CreateBlock(root interface{},
 
 	block := &Block{
 		// Slice of transactions to include in this block
-		transactions: txes,
-		PrevHash:     prevHash,
-		Coinbase:     base,
-		Difficulty:   Difficulty,
-		Nonce:        Nonce,
-		Time:         time.Now().Unix(),
-		Extra:        extra,
-		UncleSha:     EmptyShaList,
+		transactions:   txes,
+		PrevHash:       prevHash,
+		Coinbase:       base,
+		Difficulty:     Difficulty,
+		Nonce:          Nonce,
+		Time:           time.Now().Unix(),
+		Extra:          extra,
+		UncleSha:       EmptyShaList,
+		contractStates: make(map[string]*ethutil.Trie),
 	}
 	block.SetTransactions(txes)
 	block.SetUncles([]*Block{})
@@ -128,14 +131,26 @@ func (block *Block) GetContract(addr []byte) *Contract {
 		return nil
 	}
 
+	value := ethutil.NewValueFromBytes([]byte(data))
+	if value.Len() == 2 {
+		return nil
+	}
+
 	contract := &Contract{}
 	contract.RlpDecode([]byte(data))
 
+	cachedState := block.contractStates[string(addr)]
+	if cachedState != nil {
+		contract.state = cachedState
+	} else {
+		block.contractStates[string(addr)] = contract.state
+	}
+
 	return contract
 }
 func (block *Block) UpdateContract(addr []byte, contract *Contract) {
 	// Make sure the state is synced
-	contract.State().Sync()
+	//contract.State().Sync()
 
 	block.state.Update(string(addr), string(contract.RlpEncode()))
 }
@@ -190,18 +205,29 @@ func (block *Block) BlockInfo() BlockInfo {
 	return bi
 }
 
+// Sync the block's state and contract respectively
+func (block *Block) Sync() {
+	// Sync all contracts currently in cache
+	for _, val := range block.contractStates {
+		val.Sync()
+	}
+	// Sync the block state itself
+	block.state.Sync()
+}
+
+func (block *Block) Undo() {
+	// Sync all contracts currently in cache
+	for _, val := range block.contractStates {
+		val.Undo()
+	}
+	// Sync the block state itself
+	block.state.Undo()
+}
+
 func (block *Block) MakeContract(tx *Transaction) {
-	// Create contract if there's no recipient
-	if tx.IsContract() {
-		addr := tx.Hash()
-
-		value := tx.Value
-		contract := NewContract(value, []byte(""))
-		block.state.Update(string(addr), string(contract.RlpEncode()))
-		for i, val := range tx.Data {
-			contract.state.Update(string(ethutil.NumberToBytes(uint64(i), 32)), val)
-		}
-		block.UpdateContract(addr, contract)
+	contract := MakeContract(tx, NewState(block.state))
+	if contract != nil {
+		block.contractStates[string(tx.Hash()[12:])] = contract.state
 	}
 }
 
@@ -288,6 +314,7 @@ func (block *Block) RlpValueDecode(decoder *ethutil.Value) {
 	block.Time = int64(header.Get(6).BigInt().Uint64())
 	block.Extra = header.Get(7).Str()
 	block.Nonce = header.Get(8).Bytes()
+	block.contractStates = make(map[string]*ethutil.Trie)
 
 	// Tx list might be empty if this is an uncle. Uncles only have their
 	// header set.
@@ -298,12 +325,6 @@ func (block *Block) RlpValueDecode(decoder *ethutil.Value) {
 			tx := NewTransactionFromValue(txes.Get(i))
 
 			block.transactions[i] = tx
-
-			/*
-				if ethutil.Config.Debug {
-					ethutil.Config.Db.Put(tx.Hash(), ethutil.Encode(tx))
-				}
-			*/
 		}
 
 	}
@@ -335,7 +356,7 @@ func NewUncleBlockFromValue(header *ethutil.Value) *Block {
 }
 
 func (block *Block) String() string {
-	return fmt.Sprintf("Block(%x):\nPrevHash:%x\nUncleSha:%x\nCoinbase:%x\nRoot:%x\nTxSha:%x\nDiff:%v\nTime:%d\nNonce:%x", block.Hash(), block.PrevHash, block.UncleSha, block.Coinbase, block.state.Root, block.TxSha, block.Difficulty, block.Time, block.Nonce)
+	return fmt.Sprintf("Block(%x):\nPrevHash:%x\nUncleSha:%x\nCoinbase:%x\nRoot:%x\nTxSha:%x\nDiff:%v\nTime:%d\nNonce:%x\nTxs:%d\n", block.Hash(), block.PrevHash, block.UncleSha, block.Coinbase, block.state.Root, block.TxSha, block.Difficulty, block.Time, block.Nonce, len(block.transactions))
 }
 
 //////////// UNEXPORTED /////////////////
diff --git a/ethchain/block_chain.go b/ethchain/block_chain.go
index 54f48bc60..96d22366d 100644
--- a/ethchain/block_chain.go
+++ b/ethchain/block_chain.go
@@ -104,7 +104,6 @@ func (bc *BlockChain) GetChainFromHash(hash []byte, max uint64) []interface{} {
 		currentHash = block.PrevHash
 
 		chain = append(chain, block.Value().Val)
-		//chain = append([]interface{}{block.RlpValue().Value}, chain...)
 
 		num--
 	}
@@ -112,6 +111,24 @@ func (bc *BlockChain) GetChainFromHash(hash []byte, max uint64) []interface{} {
 	return chain
 }
 
+func (bc *BlockChain) GetChain(hash []byte, amount int) []*Block {
+	genHash := bc.genesisBlock.Hash()
+
+	block := bc.GetBlock(hash)
+	var blocks []*Block
+
+	for i := 0; i < amount && block != nil; block = bc.GetBlock(block.PrevHash) {
+		blocks = append([]*Block{block}, blocks...)
+
+		if bytes.Compare(genHash, block.Hash()) == 0 {
+			break
+		}
+		i++
+	}
+
+	return blocks
+}
+
 func (bc *BlockChain) setLastBlock() {
 	data, _ := ethutil.Config.Db.Get([]byte("LastBlock"))
 	if len(data) != 0 {
@@ -141,11 +158,16 @@ func (bc *BlockChain) Add(block *Block) {
 	bc.CurrentBlock = block
 	bc.LastBlockHash = block.Hash()
 
-	ethutil.Config.Db.Put(block.Hash(), block.RlpEncode())
+	encodedBlock := block.RlpEncode()
+	ethutil.Config.Db.Put(block.Hash(), encodedBlock)
+	ethutil.Config.Db.Put([]byte("LastBlock"), encodedBlock)
 }
 
 func (bc *BlockChain) GetBlock(hash []byte) *Block {
 	data, _ := ethutil.Config.Db.Get(hash)
+	if len(data) == 0 {
+		return nil
+	}
 
 	return NewBlockFromData(data)
 }
@@ -177,8 +199,6 @@ func (bc *BlockChain) writeBlockInfo(block *Block) {
 
 func (bc *BlockChain) Stop() {
 	if bc.CurrentBlock != nil {
-		ethutil.Config.Db.Put([]byte("LastBlock"), bc.CurrentBlock.RlpEncode())
-
 		log.Println("[CHAIN] Stopped")
 	}
 }
diff --git a/ethchain/block_manager.go b/ethchain/block_manager.go
index 8b237a29a..364a06158 100644
--- a/ethchain/block_manager.go
+++ b/ethchain/block_manager.go
@@ -5,11 +5,9 @@ import (
 	"encoding/hex"
 	"fmt"
 	"github.com/ethereum/eth-go/ethutil"
-	"github.com/obscuren/secp256k1-go"
+	_ "github.com/ethereum/eth-go/ethwire"
 	"log"
-	"math"
 	"math/big"
-	"strconv"
 	"sync"
 	"time"
 )
@@ -18,10 +16,7 @@ type BlockProcessor interface {
 	ProcessBlock(block *Block)
 }
 
-func CalculateBlockReward(block *Block, uncleLength int) *big.Int {
-	return BlockReward
-}
-
+// TODO rename to state manager
 type BlockManager struct {
 	// Mutex for locking the block processor. Blocks can only be handled one at a time
 	mutex sync.Mutex
@@ -29,6 +24,10 @@ type BlockManager struct {
 	// The block chain :)
 	bc *BlockChain
 
+	// States for addresses. You can watch any address
+	// at any given time
+	addrStateStore *AddrStateStore
+
 	// Stack for processing contracts
 	stack *Stack
 	// non-persistent key/value memory storage
@@ -46,9 +45,9 @@ type BlockManager struct {
 func AddTestNetFunds(block *Block) {
 	for _, addr := range []string{
 		"8a40bfaa73256b60764c1bf40675a99083efb075", // Gavin
-		"93658b04240e4bd4046fd2d6d417d20f146f4b43", // Jeffrey
+		"e6716f9544a56c530d868e4bfbacb172315bdead", // Jeffrey
 		"1e12515ce3e0f817a4ddef9ca55788a1d66bd2df", // Vit
-		"80c01a26338f0d905e295fccb71fa9ea849ffa12", // Alex
+		"1a26338f0d905e295fccb71fa9ea849ffa12aaf4", // Alex
 	} {
 		//log.Println("2^200 Wei to", addr)
 		codedAddr, _ := hex.DecodeString(addr)
@@ -61,26 +60,47 @@ func AddTestNetFunds(block *Block) {
 func NewBlockManager(speaker PublicSpeaker) *BlockManager {
 	bm := &BlockManager{
 		//server: s,
-		bc:      NewBlockChain(),
-		stack:   NewStack(),
-		mem:     make(map[string]*big.Int),
-		Pow:     &EasyPow{},
-		Speaker: speaker,
+		bc:             NewBlockChain(),
+		stack:          NewStack(),
+		mem:            make(map[string]*big.Int),
+		Pow:            &EasyPow{},
+		Speaker:        speaker,
+		addrStateStore: NewAddrStateStore(),
 	}
 
 	if bm.bc.CurrentBlock == nil {
 		AddTestNetFunds(bm.bc.genesisBlock)
+
+		bm.bc.genesisBlock.State().Sync()
 		// Prepare the genesis block
 		bm.bc.Add(bm.bc.genesisBlock)
 
-		log.Printf("Genesis: %x\n", bm.bc.genesisBlock.Hash())
 		//log.Printf("root %x\n", bm.bc.genesisBlock.State().Root)
 		//bm.bc.genesisBlock.PrintHash()
 	}
 
+	log.Printf("Last block: %x\n", bm.bc.CurrentBlock.Hash())
+
 	return bm
 }
 
+// Watches any given address and puts it in the address state store
+func (bm *BlockManager) WatchAddr(addr []byte) *AddressState {
+	account := bm.bc.CurrentBlock.GetAddr(addr)
+
+	return bm.addrStateStore.Add(addr, account)
+}
+
+func (bm *BlockManager) GetAddrState(addr []byte) *AddressState {
+	account := bm.addrStateStore.Get(addr)
+	if account == nil {
+		a := bm.bc.CurrentBlock.GetAddr(addr)
+		account = &AddressState{Nonce: a.Nonce, Account: a}
+	}
+
+	return account
+}
+
 func (bm *BlockManager) BlockChain() *BlockChain {
 	return bm.bc
 }
@@ -91,9 +111,15 @@ func (bm *BlockManager) ApplyTransactions(block *Block, txs []*Transaction) {
 		// If there's no recipient, it's a contract
 		if tx.IsContract() {
 			block.MakeContract(tx)
-			bm.ProcessContract(tx, block)
 		} else {
-			bm.TransactionPool.ProcessTransaction(tx, block)
+			if contract := block.GetContract(tx.Recipient); contract != nil {
+				bm.ProcessContract(contract, tx, block)
+			} else {
+				err := bm.TransactionPool.ProcessTransaction(tx, block)
+				if err != nil {
+					ethutil.Config.Log.Infoln("[BMGR]", err)
+				}
+			}
 		}
 	}
 }
@@ -103,6 +129,11 @@ func (bm *BlockManager) ProcessBlock(block *Block) error {
 	// Processing a blocks may never happen simultaneously
 	bm.mutex.Lock()
 	defer bm.mutex.Unlock()
+	// Defer the Undo on the Trie. If the block processing happened
+	// we don't want to undo but since undo only happens on dirty
+	// nodes this won't happen because Commit would have been called
+	// before that.
+	defer bm.bc.CurrentBlock.Undo()
 
 	hash := block.Hash()
 
@@ -110,12 +141,6 @@ func (bm *BlockManager) ProcessBlock(block *Block) error {
 		return nil
 	}
 
-	/*
-		if ethutil.Config.Debug {
-			log.Printf("[BMGR] Processing block(%x)\n", hash)
-		}
-	*/
-
 	// Check if we have the parent hash, if it isn't known we discard it
 	// Reasons might be catching up or simply an invalid block
 	if !bm.bc.HasBlock(block.PrevHash) && bm.bc.CurrentBlock != nil {
@@ -137,37 +162,19 @@ func (bm *BlockManager) ProcessBlock(block *Block) error {
 	}
 
 	if !block.State().Cmp(bm.bc.CurrentBlock.State()) {
-		//if block.State().Root != state.Root {
 		return fmt.Errorf("Invalid merkle root. Expected %x, got %x", block.State().Root, bm.bc.CurrentBlock.State().Root)
 	}
 
 	// Calculate the new total difficulty and sync back to the db
 	if bm.CalculateTD(block) {
-		// Sync the current block's state to the database
-		bm.bc.CurrentBlock.State().Sync()
-		// Add the block to the chain
-		bm.bc.Add(block)
-
-		/*
-			ethutil.Config.Db.Put(block.Hash(), block.RlpEncode())
-			bm.bc.CurrentBlock = block
-			bm.LastBlockHash = block.Hash()
-			bm.writeBlockInfo(block)
-		*/
-
-		/*
-			txs := bm.TransactionPool.Flush()
-			var coded = []interface{}{}
-			for _, tx := range txs {
-				err := bm.TransactionPool.ValidateTransaction(tx)
-				if err == nil {
-					coded = append(coded, tx.RlpEncode())
-				}
-			}
-		*/
+		// Sync the current block's state to the database and cancelling out the deferred Undo
+		bm.bc.CurrentBlock.Sync()
 
 		// Broadcast the valid block back to the wire
-		//bm.Speaker.Broadcast(ethwire.MsgBlockTy, []interface{}{block.RlpValue().Value})
+		//bm.Speaker.Broadcast(ethwire.MsgBlockTy, []interface{}{block.Value().Val})
+
+		// Add the block to the chain
+		bm.bc.Add(block)
 
 		// If there's a block processor present, pass in the block for further
 		// processing
@@ -175,7 +182,7 @@ func (bm *BlockManager) ProcessBlock(block *Block) error {
 			bm.SecondaryBlockProcessor.ProcessBlock(block)
 		}
 
-		log.Printf("[BMGR] Added block #%d (%x)\n", block.BlockInfo().Number, block.Hash())
+		ethutil.Config.Log.Infof("[BMGR] Added block #%d (%x)\n", block.BlockInfo().Number, block.Hash())
 	} else {
 		fmt.Println("total diff failed")
 	}
@@ -246,6 +253,18 @@ func (bm *BlockManager) ValidateBlock(block *Block) error {
 	return nil
 }
 
+func CalculateBlockReward(block *Block, uncleLength int) *big.Int {
+	base := new(big.Int)
+	for i := 0; i < uncleLength; i++ {
+		base.Add(base, UncleInclusionReward)
+	}
+	return base.Add(base, BlockReward)
+}
+
+func CalculateUncleReward(block *Block) *big.Int {
+	return UncleReward
+}
+
 func (bm *BlockManager) AccumelateRewards(processor *Block, block *Block) error {
 	// Get the coinbase rlp data
 	addr := processor.GetAddr(block.Coinbase)
@@ -254,7 +273,12 @@ func (bm *BlockManager) AccumelateRewards(processor *Block, block *Block) error
 
 	processor.UpdateAddr(block.Coinbase, addr)
 
-	// TODO Reward each uncle
+	for _, uncle := range block.Uncles {
+		uncleAddr := processor.GetAddr(uncle.Coinbase)
+		uncleAddr.AddFee(CalculateUncleReward(uncle))
+
+		processor.UpdateAddr(uncle.Coinbase, uncleAddr)
+	}
 
 	return nil
 }
@@ -263,363 +287,26 @@ func (bm *BlockManager) Stop() {
 	bm.bc.Stop()
 }
 
-func (bm *BlockManager) ProcessContract(tx *Transaction, block *Block) {
+func (bm *BlockManager) ProcessContract(contract *Contract, tx *Transaction, block *Block) {
 	// Recovering function in case the VM had any errors
-	defer func() {
-		if r := recover(); r != nil {
-			fmt.Println("Recovered from VM execution with err =", r)
-		}
-	}()
-
-	// Process contract
-	bm.ProcContract(tx, block, func(opType OpType) bool {
-		// TODO turn on once big ints are in place
-		//if !block.PayFee(tx.Hash(), StepFee.Uint64()) {
-		//  return false
-		//}
-
-		return true // Continue
-	})
-}
-
-// Contract evaluation is done here.
-func (bm *BlockManager) ProcContract(tx *Transaction, block *Block, cb TxCallback) {
-
-	// Instruction pointer
-	pc := 0
-	blockInfo := bm.bc.BlockInfo(block)
-
-	contract := block.GetContract(tx.Hash())
-	if contract == nil {
-		fmt.Println("Contract not found")
-		return
-	}
-
-	Pow256 := ethutil.BigPow(2, 256)
-
-	if ethutil.Config.Debug {
-		fmt.Printf("#   op   arg\n")
-	}
-out:
-	for {
-		// The base big int for all calculations. Use this for any results.
-		base := new(big.Int)
-		// XXX Should Instr return big int slice instead of string slice?
-		// Get the next instruction from the contract
-		//op, _, _ := Instr(contract.state.Get(string(Encode(uint32(pc)))))
-		nb := ethutil.NumberToBytes(uint64(pc), 32)
-		o, _, _ := ethutil.Instr(contract.State().Get(string(nb)))
-		op := OpCode(o)
-
-		if !cb(0) {
-			break
-		}
-
-		if ethutil.Config.Debug {
-			fmt.Printf("%-3d %-4s\n", pc, op.String())
-		}
-
-		switch op {
-		case oSTOP:
-			break out
-		case oADD:
-			x, y := bm.stack.Popn()
-			// (x + y) % 2 ** 256
-			base.Add(x, y)
-			base.Mod(base, Pow256)
-			// Pop result back on the stack
-			bm.stack.Push(base)
-		case oSUB:
-			x, y := bm.stack.Popn()
-			// (x - y) % 2 ** 256
-			base.Sub(x, y)
-			base.Mod(base, Pow256)
-			// Pop result back on the stack
-			bm.stack.Push(base)
-		case oMUL:
-			x, y := bm.stack.Popn()
-			// (x * y) % 2 ** 256
-			base.Mul(x, y)
-			base.Mod(base, Pow256)
-			// Pop result back on the stack
-			bm.stack.Push(base)
-		case oDIV:
-			x, y := bm.stack.Popn()
-			// floor(x / y)
-			base.Div(x, y)
-			// Pop result back on the stack
-			bm.stack.Push(base)
-		case oSDIV:
-			x, y := bm.stack.Popn()
-			// n > 2**255
-			if x.Cmp(Pow256) > 0 {
-				x.Sub(Pow256, x)
-			}
-			if y.Cmp(Pow256) > 0 {
-				y.Sub(Pow256, y)
-			}
-			z := new(big.Int)
-			z.Div(x, y)
-			if z.Cmp(Pow256) > 0 {
-				z.Sub(Pow256, z)
-			}
-			// Push result on to the stack
-			bm.stack.Push(z)
-		case oMOD:
-			x, y := bm.stack.Popn()
-			base.Mod(x, y)
-			bm.stack.Push(base)
-		case oSMOD:
-			x, y := bm.stack.Popn()
-			// n > 2**255
-			if x.Cmp(Pow256) > 0 {
-				x.Sub(Pow256, x)
-			}
-			if y.Cmp(Pow256) > 0 {
-				y.Sub(Pow256, y)
-			}
-			z := new(big.Int)
-			z.Mod(x, y)
-			if z.Cmp(Pow256) > 0 {
-				z.Sub(Pow256, z)
-			}
-			// Push result on to the stack
-			bm.stack.Push(z)
-		case oEXP:
-			x, y := bm.stack.Popn()
-			base.Exp(x, y, Pow256)
-
-			bm.stack.Push(base)
-		case oNEG:
-			base.Sub(Pow256, bm.stack.Pop())
-			bm.stack.Push(base)
-		case oLT:
-			x, y := bm.stack.Popn()
-			// x < y
-			if x.Cmp(y) < 0 {
-				bm.stack.Push(ethutil.BigTrue)
-			} else {
-				bm.stack.Push(ethutil.BigFalse)
-			}
-		case oLE:
-			x, y := bm.stack.Popn()
-			// x <= y
-			if x.Cmp(y) < 1 {
-				bm.stack.Push(ethutil.BigTrue)
-			} else {
-				bm.stack.Push(ethutil.BigFalse)
-			}
-		case oGT:
-			x, y := bm.stack.Popn()
-			// x > y
-			if x.Cmp(y) > 0 {
-				bm.stack.Push(ethutil.BigTrue)
-			} else {
-				bm.stack.Push(ethutil.BigFalse)
-			}
-		case oGE:
-			x, y := bm.stack.Popn()
-			// x >= y
-			if x.Cmp(y) > -1 {
-				bm.stack.Push(ethutil.BigTrue)
-			} else {
-				bm.stack.Push(ethutil.BigFalse)
-			}
-		case oNOT:
-			x, y := bm.stack.Popn()
-			// x != y
-			if x.Cmp(y) != 0 {
-				bm.stack.Push(ethutil.BigTrue)
-			} else {
-				bm.stack.Push(ethutil.BigFalse)
-			}
-
-		// Please note  that the  following code contains some
-		// ugly string casting. This will have to change to big
-		// ints. TODO :)
-		case oMYADDRESS:
-			bm.stack.Push(ethutil.BigD(tx.Hash()))
-		case oTXSENDER:
-			bm.stack.Push(ethutil.BigD(tx.Sender()))
-		case oTXVALUE:
-			bm.stack.Push(tx.Value)
-		case oTXDATAN:
-			bm.stack.Push(big.NewInt(int64(len(tx.Data))))
-		case oTXDATA:
-			v := bm.stack.Pop()
-			// v >= len(data)
-			if v.Cmp(big.NewInt(int64(len(tx.Data)))) >= 0 {
-				bm.stack.Push(ethutil.Big("0"))
-			} else {
-				bm.stack.Push(ethutil.Big(tx.Data[v.Uint64()]))
-			}
-		case oBLK_PREVHASH:
-			bm.stack.Push(ethutil.BigD(block.PrevHash))
-		case oBLK_COINBASE:
-			bm.stack.Push(ethutil.BigD(block.Coinbase))
-		case oBLK_TIMESTAMP:
-			bm.stack.Push(big.NewInt(block.Time))
-		case oBLK_NUMBER:
-			bm.stack.Push(big.NewInt(int64(blockInfo.Number)))
-		case oBLK_DIFFICULTY:
-			bm.stack.Push(block.Difficulty)
-		case oBASEFEE:
-			// e = 10^21
-			e := big.NewInt(0).Exp(big.NewInt(10), big.NewInt(21), big.NewInt(0))
-			d := new(big.Rat)
-			d.SetInt(block.Difficulty)
-			c := new(big.Rat)
-			c.SetFloat64(0.5)
-			// d = diff / 0.5
-			d.Quo(d, c)
-			// base = floor(d)
-			base.Div(d.Num(), d.Denom())
-
-			x := new(big.Int)
-			x.Div(e, base)
-
-			// x = floor(10^21 / floor(diff^0.5))
-			bm.stack.Push(x)
-		case oSHA256, oSHA3, oRIPEMD160:
-			// This is probably save
-			// ceil(pop / 32)
-			length := int(math.Ceil(float64(bm.stack.Pop().Uint64()) / 32.0))
-			// New buffer which will contain the concatenated popped items
-			data := new(bytes.Buffer)
-			for i := 0; i < length; i++ {
-				// Encode the number to bytes and have it 32bytes long
-				num := ethutil.NumberToBytes(bm.stack.Pop().Bytes(), 256)
-				data.WriteString(string(num))
-			}
-
-			if op == oSHA256 {
-				bm.stack.Push(base.SetBytes(ethutil.Sha256Bin(data.Bytes())))
-			} else if op == oSHA3 {
-				bm.stack.Push(base.SetBytes(ethutil.Sha3Bin(data.Bytes())))
-			} else {
-				bm.stack.Push(base.SetBytes(ethutil.Ripemd160(data.Bytes())))
-			}
-		case oECMUL:
-			y := bm.stack.Pop()
-			x := bm.stack.Pop()
-			//n := bm.stack.Pop()
-
-			//if ethutil.Big(x).Cmp(ethutil.Big(y)) {
-			data := new(bytes.Buffer)
-			data.WriteString(x.String())
-			data.WriteString(y.String())
-			if secp256k1.VerifyPubkeyValidity(data.Bytes()) == 1 {
-				// TODO
-			} else {
-				// Invalid, push infinity
-				bm.stack.Push(ethutil.Big("0"))
-				bm.stack.Push(ethutil.Big("0"))
-			}
-			//} else {
-			//	// Invalid, push infinity
-			//	bm.stack.Push("0")
-			//	bm.stack.Push("0")
-			//}
-
-		case oECADD:
-		case oECSIGN:
-		case oECRECOVER:
-		case oECVALID:
-		case oPUSH:
-			pc++
-			bm.stack.Push(bm.mem[strconv.Itoa(pc)])
-		case oPOP:
-			// Pop current value of the stack
-			bm.stack.Pop()
-		case oDUP:
-			// Dup top stack
-			x := bm.stack.Pop()
-			bm.stack.Push(x)
-			bm.stack.Push(x)
-		case oSWAP:
-			// Swap two top most values
-			x, y := bm.stack.Popn()
-			bm.stack.Push(y)
-			bm.stack.Push(x)
-		case oMLOAD:
-			x := bm.stack.Pop()
-			bm.stack.Push(bm.mem[x.String()])
-		case oMSTORE:
-			x, y := bm.stack.Popn()
-			bm.mem[x.String()] = y
-		case oSLOAD:
-			// Load the value in storage and push it on the stack
-			x := bm.stack.Pop()
-			// decode the object as a big integer
-			decoder := ethutil.NewValueFromBytes([]byte(contract.State().Get(x.String())))
-			if !decoder.IsNil() {
-				bm.stack.Push(decoder.BigInt())
-			} else {
-				bm.stack.Push(ethutil.BigFalse)
-			}
-		case oSSTORE:
-			// Store Y at index X
-			x, y := bm.stack.Popn()
-			contract.State().Update(x.String(), string(ethutil.Encode(y)))
-		case oJMP:
-			x := int(bm.stack.Pop().Uint64())
-			// Set pc to x - 1 (minus one so the incrementing at the end won't effect it)
-			pc = x
-			pc--
-		case oJMPI:
-			x := bm.stack.Pop()
-			// Set pc to x if it's non zero
-			if x.Cmp(ethutil.BigFalse) != 0 {
-				pc = int(x.Uint64())
-				pc--
-			}
-		case oIND:
-			bm.stack.Push(big.NewInt(int64(pc)))
-		case oEXTRO:
-			memAddr := bm.stack.Pop()
-			contractAddr := bm.stack.Pop().Bytes()
-
-			// Push the contract's memory on to the stack
-			bm.stack.Push(getContractMemory(block, contractAddr, memAddr))
-		case oBALANCE:
-			// Pushes the balance of the popped value on to the stack
-			d := block.State().Get(bm.stack.Pop().String())
-			ether := NewAddressFromData([]byte(d))
-			bm.stack.Push(ether.Amount)
-		case oMKTX:
-			value, addr := bm.stack.Popn()
-			from, length := bm.stack.Popn()
-
-			j := 0
-			dataItems := make([]string, int(length.Uint64()))
-			for i := from.Uint64(); i < length.Uint64(); i++ {
-				dataItems[j] = string(bm.mem[strconv.Itoa(int(i))].Bytes())
-				j++
+	/*
+		defer func() {
+			if r := recover(); r != nil {
+				fmt.Println("Recovered from VM execution with err =", r)
 			}
-			// TODO sign it?
-			tx := NewTransaction(addr.Bytes(), value, dataItems)
-			// Add the transaction to the tx pool
-			bm.TransactionPool.QueueTransaction(tx)
-		case oSUICIDE:
-			//addr := bm.stack.Pop()
-		}
-		pc++
-	}
-}
-
-// Returns an address from the specified contract's address
-func getContractMemory(block *Block, contractAddr []byte, memAddr *big.Int) *big.Int {
-	contract := block.GetContract(contractAddr)
-	if contract == nil {
-		log.Panicf("invalid contract addr %x", contractAddr)
-	}
-	val := contract.State().Get(memAddr.String())
-
-	// decode the object as a big integer
-	decoder := ethutil.NewValueFromBytes([]byte(val))
-	if decoder.IsNil() {
-		return ethutil.BigFalse
-	}
+		}()
+	*/
 
-	return decoder.BigInt()
+	vm := &Vm{}
+	vm.Process(contract, NewState(block.state), RuntimeVars{
+		address:     tx.Hash()[12:],
+		blockNumber: block.BlockInfo().Number,
+		sender:      tx.Sender(),
+		prevHash:    block.PrevHash,
+		coinbase:    block.Coinbase,
+		time:        block.Time,
+		diff:        block.Difficulty,
+		txValue:     tx.Value,
+		txData:      tx.Data,
+	})
 }
diff --git a/ethchain/block_manager_test.go b/ethchain/block_manager_test.go
index 502c50b97..ec4fbe8c5 100644
--- a/ethchain/block_manager_test.go
+++ b/ethchain/block_manager_test.go
@@ -1,75 +1,33 @@
 package ethchain
 
-/*
 import (
 	_ "fmt"
+	"github.com/ethereum/eth-go/ethdb"
+	"github.com/ethereum/eth-go/ethutil"
+	"math/big"
 	"testing"
 )
 
 func TestVm(t *testing.T) {
 	InitFees()
-
-	db, _ := NewMemDatabase()
-	Db = db
-
-	ctrct := NewTransaction("", 200000000, []string{
-		"PUSH", "1a2f2e",
-		"PUSH", "hallo",
-		"POP", // POP hallo
-		"PUSH", "3",
-		"LOAD", // Load hallo back on the stack
-
-		"PUSH", "1",
-		"PUSH", "2",
-		"ADD",
-
-		"PUSH", "2",
-		"PUSH", "1",
-		"SUB",
-
-		"PUSH", "100000000000000000000000",
-		"PUSH", "10000000000000",
-		"SDIV",
-
-		"PUSH", "105",
-		"PUSH", "200",
-		"MOD",
-
-		"PUSH", "100000000000000000000000",
-		"PUSH", "10000000000000",
-		"SMOD",
-
-		"PUSH", "5",
-		"PUSH", "10",
-		"LT",
-
-		"PUSH", "5",
-		"PUSH", "5",
-		"LE",
-
-		"PUSH", "50",
-		"PUSH", "5",
-		"GT",
-
-		"PUSH", "5",
-		"PUSH", "5",
-		"GE",
-
-		"PUSH", "10",
-		"PUSH", "10",
-		"NOT",
-
-		"MYADDRESS",
-		"TXSENDER",
-
-		"STOP",
+	ethutil.ReadConfig("")
+
+	db, _ := ethdb.NewMemDatabase()
+	ethutil.Config.Db = db
+	bm := NewBlockManager(nil)
+
+	block := bm.bc.genesisBlock
+	script := Compile([]string{
+		"PUSH",
+		"1",
+		"PUSH",
+		"2",
 	})
-	tx := NewTransaction("1e8a42ea8cce13", 100, []string{})
-
-	block := CreateBlock("", 0, "", "c014ba53", 0, 0, "", []*Transaction{ctrct, tx})
-	db.Put(block.Hash(), block.RlpEncode())
+	tx := NewTransaction(ContractAddr, big.NewInt(200000000), script)
+	addr := tx.Hash()[12:]
+	bm.ApplyTransactions(block, []*Transaction{tx})
 
-	bm := NewBlockManager()
-	bm.ProcessBlock(block)
+	tx2 := NewTransaction(addr, big.NewInt(1e17), nil)
+	tx2.Sign([]byte("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"))
+	bm.ApplyTransactions(block, []*Transaction{tx2})
 }
-*/
diff --git a/ethchain/contract.go b/ethchain/contract.go
index 70189593b..dbcbb3697 100644
--- a/ethchain/contract.go
+++ b/ethchain/contract.go
@@ -30,37 +30,42 @@ func (c *Contract) RlpDecode(data []byte) {
 	c.state = ethutil.NewTrie(ethutil.Config.Db, decoder.Get(2).Interface())
 }
 
-func (c *Contract) State() *ethutil.Trie {
-	return c.state
-}
-
-type Address struct {
-	Amount *big.Int
-	Nonce  uint64
+func (c *Contract) Addr(addr []byte) *ethutil.Value {
+	return ethutil.NewValueFromBytes([]byte(c.state.Get(string(addr))))
 }
 
-func NewAddress(amount *big.Int) *Address {
-	return &Address{Amount: amount, Nonce: 0}
+func (c *Contract) SetAddr(addr []byte, value interface{}) {
+	c.state.Update(string(addr), string(ethutil.NewValue(value).Encode()))
 }
 
-func NewAddressFromData(data []byte) *Address {
-	address := &Address{}
-	address.RlpDecode(data)
-
-	return address
+func (c *Contract) State() *ethutil.Trie {
+	return c.state
 }
 
-func (a *Address) AddFee(fee *big.Int) {
-	a.Amount.Add(a.Amount, fee)
-}
+func (c *Contract) GetMem(num int) *ethutil.Value {
+	nb := ethutil.BigToBytes(big.NewInt(int64(num)), 256)
 
-func (a *Address) RlpEncode() []byte {
-	return ethutil.Encode([]interface{}{a.Amount, a.Nonce})
+	return c.Addr(nb)
 }
 
-func (a *Address) RlpDecode(data []byte) {
-	decoder := ethutil.NewValueFromBytes(data)
-
-	a.Amount = decoder.Get(0).BigInt()
-	a.Nonce = decoder.Get(1).Uint()
+func MakeContract(tx *Transaction, state *State) *Contract {
+	// Create contract if there's no recipient
+	if tx.IsContract() {
+		addr := tx.Hash()[12:]
+
+		value := tx.Value
+		contract := NewContract(value, []byte(""))
+		state.trie.Update(string(addr), string(contract.RlpEncode()))
+		for i, val := range tx.Data {
+			if len(val) > 0 {
+				bytNum := ethutil.BigToBytes(big.NewInt(int64(i)), 256)
+				contract.state.Update(string(bytNum), string(ethutil.Encode(val)))
+			}
+		}
+		state.trie.Update(string(addr), string(contract.RlpEncode()))
+
+		return contract
+	}
+
+	return nil
 }
diff --git a/ethchain/fees.go b/ethchain/fees.go
index 8f1646ab4..02f09fa04 100644
--- a/ethchain/fees.go
+++ b/ethchain/fees.go
@@ -4,22 +4,32 @@ import (
 	"math/big"
 )
 
-var StepFee *big.Int = new(big.Int)
 var TxFeeRat *big.Int = big.NewInt(100000000000000)
+
 var TxFee *big.Int = big.NewInt(100)
-var ContractFee *big.Int = new(big.Int)
-var MemFee *big.Int = new(big.Int)
-var DataFee *big.Int = new(big.Int)
-var CryptoFee *big.Int = new(big.Int)
-var ExtroFee *big.Int = new(big.Int)
+var StepFee *big.Int = big.NewInt(1)
+var StoreFee *big.Int = big.NewInt(5)
+var DataFee *big.Int = big.NewInt(20)
+var ExtroFee *big.Int = big.NewInt(40)
+var CryptoFee *big.Int = big.NewInt(20)
+var ContractFee *big.Int = big.NewInt(100)
+
+var BlockReward *big.Int = big.NewInt(1.5e+18)
+var UncleReward *big.Int = big.NewInt(1.125e+18)
+var UncleInclusionReward *big.Int = big.NewInt(1.875e+17)
 
-var BlockReward *big.Int = big.NewInt(1500000000000000000)
 var Period1Reward *big.Int = new(big.Int)
 var Period2Reward *big.Int = new(big.Int)
 var Period3Reward *big.Int = new(big.Int)
 var Period4Reward *big.Int = new(big.Int)
 
 func InitFees() {
+	StepFee.Mul(StepFee, TxFeeRat)
+	StoreFee.Mul(StoreFee, TxFeeRat)
+	DataFee.Mul(DataFee, TxFeeRat)
+	ExtroFee.Mul(ExtroFee, TxFeeRat)
+	CryptoFee.Mul(CryptoFee, TxFeeRat)
+	ContractFee.Mul(ContractFee, TxFeeRat)
 	/*
 		// Base for 2**64
 		b60 := new(big.Int)
diff --git a/ethchain/genesis.go b/ethchain/genesis.go
index 060d347e4..935978a69 100644
--- a/ethchain/genesis.go
+++ b/ethchain/genesis.go
@@ -13,7 +13,7 @@ var ZeroHash256 = make([]byte, 32)
 var ZeroHash160 = make([]byte, 20)
 var EmptyShaList = ethutil.Sha3Bin(ethutil.Encode([]interface{}{}))
 
-var GenisisHeader = []interface{}{
+var GenesisHeader = []interface{}{
 	// Previous hash (none)
 	//"",
 	ZeroHash256,
@@ -36,4 +36,4 @@ var GenisisHeader = []interface{}{
 	ethutil.Sha3Bin(big.NewInt(42).Bytes()),
 }
 
-var Genesis = []interface{}{GenisisHeader, []interface{}{}, []interface{}{}}
+var Genesis = []interface{}{GenesisHeader, []interface{}{}, []interface{}{}}
diff --git a/ethchain/stack.go b/ethchain/stack.go
index c80d01e5c..13b0f247b 100644
--- a/ethchain/stack.go
+++ b/ethchain/stack.go
@@ -9,57 +9,57 @@ type OpCode int
 
 // Op codes
 const (
-	oSTOP OpCode = iota
-	oADD
-	oMUL
-	oSUB
-	oDIV
-	oSDIV
-	oMOD
-	oSMOD
-	oEXP
-	oNEG
-	oLT
-	oLE
-	oGT
-	oGE
-	oEQ
-	oNOT
-	oMYADDRESS
-	oTXSENDER
-	oTXVALUE
-	oTXFEE
-	oTXDATAN
-	oTXDATA
-	oBLK_PREVHASH
-	oBLK_COINBASE
-	oBLK_TIMESTAMP
-	oBLK_NUMBER
-	oBLK_DIFFICULTY
-	oBASEFEE
-	oSHA256    OpCode = 32
-	oRIPEMD160 OpCode = 33
-	oECMUL     OpCode = 34
-	oECADD     OpCode = 35
-	oECSIGN    OpCode = 36
-	oECRECOVER OpCode = 37
-	oECVALID   OpCode = 38
-	oSHA3      OpCode = 39
-	oPUSH      OpCode = 48
-	oPOP       OpCode = 49
-	oDUP       OpCode = 50
-	oSWAP      OpCode = 51
-	oMLOAD     OpCode = 52
-	oMSTORE    OpCode = 53
-	oSLOAD     OpCode = 54
-	oSSTORE    OpCode = 55
-	oJMP       OpCode = 56
-	oJMPI      OpCode = 57
-	oIND       OpCode = 58
-	oEXTRO     OpCode = 59
-	oBALANCE   OpCode = 60
-	oMKTX      OpCode = 61
-	oSUICIDE   OpCode = 62
+	oSTOP           = 0x00
+	oADD            = 0x01
+	oMUL            = 0x02
+	oSUB            = 0x03
+	oDIV            = 0x04
+	oSDIV           = 0x05
+	oMOD            = 0x06
+	oSMOD           = 0x07
+	oEXP            = 0x08
+	oNEG            = 0x09
+	oLT             = 0x0a
+	oLE             = 0x0b
+	oGT             = 0x0c
+	oGE             = 0x0d
+	oEQ             = 0x0e
+	oNOT            = 0x0f
+	oMYADDRESS      = 0x10
+	oTXSENDER       = 0x11
+	oTXVALUE        = 0x12
+	oTXDATAN        = 0x13
+	oTXDATA         = 0x14
+	oBLK_PREVHASH   = 0x15
+	oBLK_COINBASE   = 0x16
+	oBLK_TIMESTAMP  = 0x17
+	oBLK_NUMBER     = 0x18
+	oBLK_DIFFICULTY = 0x19
+	oBLK_NONCE      = 0x1a
+	oBASEFEE        = 0x1b
+	oSHA256         = 0x20
+	oRIPEMD160      = 0x21
+	oECMUL          = 0x22
+	oECADD          = 0x23
+	oECSIGN         = 0x24
+	oECRECOVER      = 0x25
+	oECVALID        = 0x26
+	oSHA3           = 0x27
+	oPUSH           = 0x30
+	oPOP            = 0x31
+	oDUP            = 0x32
+	oSWAP           = 0x33
+	oMLOAD          = 0x34
+	oMSTORE         = 0x35
+	oSLOAD          = 0x36
+	oSSTORE         = 0x37
+	oJMP            = 0x38
+	oJMPI           = 0x39
+	oIND            = 0x3a
+	oEXTRO          = 0x3b
+	oBALANCE        = 0x3c
+	oMKTX           = 0x3d
+	oSUICIDE        = 0x3f
 )
 
 // Since the opcodes aren't all in order we can't use a regular slice
@@ -83,7 +83,6 @@ var opCodeToString = map[OpCode]string{
 	oMYADDRESS:      "MYADDRESS",
 	oTXSENDER:       "TXSENDER",
 	oTXVALUE:        "TXVALUE",
-	oTXFEE:          "TXFEE",
 	oTXDATAN:        "TXDATAN",
 	oTXDATA:         "TXDATA",
 	oBLK_PREVHASH:   "BLK_PREVHASH",
@@ -159,9 +158,33 @@ func (st *Stack) Popn() (*big.Int, *big.Int) {
 	return ints[0], ints[1]
 }
 
+func (st *Stack) Peek() *big.Int {
+	s := len(st.data)
+
+	str := st.data[s-1]
+
+	return str
+}
+
+func (st *Stack) Peekn() (*big.Int, *big.Int) {
+	s := len(st.data)
+
+	ints := st.data[s-2:]
+
+	return ints[0], ints[1]
+}
+
 func (st *Stack) Push(d *big.Int) {
 	st.data = append(st.data, d)
 }
 func (st *Stack) Print() {
-	fmt.Println(st.data)
+	fmt.Println("### STACK ###")
+	if len(st.data) > 0 {
+		for i, val := range st.data {
+			fmt.Printf("%-3d  %v\n", i, val)
+		}
+	} else {
+		fmt.Println("-- empty --")
+	}
+	fmt.Println("#############")
 }
diff --git a/ethchain/state.go b/ethchain/state.go
new file mode 100644
index 000000000..1a18ea1d7
--- /dev/null
+++ b/ethchain/state.go
@@ -0,0 +1,56 @@
+package ethchain
+
+import (
+	"github.com/ethereum/eth-go/ethutil"
+	"math/big"
+)
+
+type State struct {
+	trie *ethutil.Trie
+}
+
+func NewState(trie *ethutil.Trie) *State {
+	return &State{trie: trie}
+}
+
+func (s *State) GetContract(addr []byte) *Contract {
+	data := s.trie.Get(string(addr))
+	if data == "" {
+		return nil
+	}
+
+	contract := &Contract{}
+	contract.RlpDecode([]byte(data))
+
+	return contract
+}
+
+func (s *State) UpdateContract(addr []byte, contract *Contract) {
+	s.trie.Update(string(addr), string(contract.RlpEncode()))
+}
+
+func Compile(code []string) (script []string) {
+	script = make([]string, len(code))
+	for i, val := range code {
+		instr, _ := ethutil.CompileInstr(val)
+
+		script[i] = string(instr)
+	}
+
+	return
+}
+
+func (s *State) GetAccount(addr []byte) (account *Address) {
+	data := s.trie.Get(string(addr))
+	if data == "" {
+		account = NewAddress(big.NewInt(0))
+	} else {
+		account = NewAddressFromData([]byte(data))
+	}
+
+	return
+}
+
+func (s *State) UpdateAccount(addr []byte, account *Address) {
+	s.trie.Update(string(addr), string(account.RlpEncode()))
+}
diff --git a/ethchain/transaction.go b/ethchain/transaction.go
index 1a9258201..57df9cdc4 100644
--- a/ethchain/transaction.go
+++ b/ethchain/transaction.go
@@ -1,11 +1,14 @@
 package ethchain
 
 import (
+	"bytes"
 	"github.com/ethereum/eth-go/ethutil"
 	"github.com/obscuren/secp256k1-go"
 	"math/big"
 )
 
+var ContractAddr = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
+
 type Transaction struct {
 	Nonce     uint64
 	Recipient []byte
@@ -21,20 +24,17 @@ func NewTransaction(to []byte, value *big.Int, data []string) *Transaction {
 	tx.Nonce = 0
 
 	// Serialize the data
-	tx.Data = make([]string, len(data))
-	for i, val := range data {
-		instr, err := ethutil.CompileInstr(val)
-		if err != nil {
-			//fmt.Printf("compile error:%d %v\n", i+1, err)
-		}
-
-		tx.Data[i] = instr
-	}
+	tx.Data = data
 
 	return &tx
 }
 
+// XXX Deprecated
 func NewTransactionFromData(data []byte) *Transaction {
+	return NewTransactionFromBytes(data)
+}
+
+func NewTransactionFromBytes(data []byte) *Transaction {
 	tx := &Transaction{}
 	tx.RlpDecode(data)
 
@@ -65,7 +65,7 @@ func (tx *Transaction) Hash() []byte {
 }
 
 func (tx *Transaction) IsContract() bool {
-	return len(tx.Recipient) == 0
+	return bytes.Compare(tx.Recipient, ContractAddr) == 0
 }
 
 func (tx *Transaction) Signature(key []byte) []byte {
diff --git a/ethchain/transaction_pool.go b/ethchain/transaction_pool.go
index c2d65a2a7..cd09bf02e 100644
--- a/ethchain/transaction_pool.go
+++ b/ethchain/transaction_pool.go
@@ -17,6 +17,17 @@ const (
 )
 
 type TxPoolHook chan *Transaction
+type TxMsgTy byte
+
+const (
+	TxPre = iota
+	TxPost
+)
+
+type TxMsg struct {
+	Tx   *Transaction
+	Type TxMsgTy
+}
 
 func FindTx(pool *list.List, finder func(*Transaction, *list.Element) bool) *Transaction {
 	for e := pool.Front(); e != nil; e = e.Next() {
@@ -34,6 +45,10 @@ type PublicSpeaker interface {
 	Broadcast(msgType ethwire.MsgType, data []interface{})
 }
 
+type TxProcessor interface {
+	ProcessTransaction(tx *Transaction)
+}
+
 // The tx pool a thread safe transaction pool handler. In order to
 // guarantee a non blocking pool we use a queue channel which can be
 // independently read without needing access to the actual pool. If the
@@ -54,7 +69,9 @@ type TxPool struct {
 
 	BlockManager *BlockManager
 
-	Hook TxPoolHook
+	SecondaryProcessor TxProcessor
+
+	subscribers []chan TxMsg
 }
 
 func NewTxPool() *TxPool {
@@ -80,8 +97,6 @@ func (pool *TxPool) addTransaction(tx *Transaction) {
 // Process transaction validates the Tx and processes funds from the
 // sender to the recipient.
 func (pool *TxPool) ProcessTransaction(tx *Transaction, block *Block) (err error) {
-	log.Printf("[TXPL] Processing Tx %x\n", tx.Hash())
-
 	defer func() {
 		if r := recover(); r != nil {
 			log.Println(r)
@@ -106,17 +121,30 @@ func (pool *TxPool) ProcessTransaction(tx *Transaction, block *Block) (err error
 		}
 	}
 
-	// Subtract the amount from the senders account
-	sender.Amount.Sub(sender.Amount, totAmount)
-	sender.Nonce += 1
-
 	// Get the receiver
 	receiver := block.GetAddr(tx.Recipient)
-	// Add the amount to receivers account which should conclude this transaction
-	receiver.Amount.Add(receiver.Amount, tx.Value)
+	sender.Nonce += 1
+
+	// Send Tx to self
+	if bytes.Compare(tx.Recipient, tx.Sender()) == 0 {
+		// Subtract the fee
+		sender.Amount.Sub(sender.Amount, new(big.Int).Mul(TxFee, TxFeeRat))
+	} else {
+		// Subtract the amount from the senders account
+		sender.Amount.Sub(sender.Amount, totAmount)
+
+		// Add the amount to receivers account which should conclude this transaction
+		receiver.Amount.Add(receiver.Amount, tx.Value)
+
+		block.UpdateAddr(tx.Recipient, receiver)
+	}
 
 	block.UpdateAddr(tx.Sender(), sender)
-	block.UpdateAddr(tx.Recipient, receiver)
+
+	log.Printf("[TXPL] Processed Tx %x\n", tx.Hash())
+
+	// Notify the subscribers
+	pool.notifySubscribers(TxPost, tx)
 
 	return
 }
@@ -131,7 +159,8 @@ func (pool *TxPool) ValidateTransaction(tx *Transaction) error {
 	}
 
 	// Get the sender
-	sender := block.GetAddr(tx.Sender())
+	accountState := pool.BlockManager.GetAddrState(tx.Sender())
+	sender := accountState.Account
 
 	totAmount := new(big.Int).Add(tx.Value, new(big.Int).Mul(TxFee, TxFeeRat))
 	// Make sure there's enough in the sender's account. Having insufficient
@@ -171,9 +200,8 @@ out:
 				// doesn't matter since this is a goroutine
 				pool.addTransaction(tx)
 
-				if pool.Hook != nil {
-					pool.Hook <- tx
-				}
+				// Notify the subscribers
+				pool.notifySubscribers(TxPre, tx)
 			}
 		case <-pool.quit:
 			break out
@@ -217,3 +245,14 @@ func (pool *TxPool) Stop() {
 
 	pool.Flush()
 }
+
+func (pool *TxPool) Subscribe(channel chan TxMsg) {
+	pool.subscribers = append(pool.subscribers, channel)
+}
+
+func (pool *TxPool) notifySubscribers(ty TxMsgTy, tx *Transaction) {
+	msg := TxMsg{Type: ty, Tx: tx}
+	for _, subscriber := range pool.subscribers {
+		subscriber <- msg
+	}
+}
diff --git a/ethchain/transaction_test.go b/ethchain/transaction_test.go
index c9090b83d..a49768aea 100644
--- a/ethchain/transaction_test.go
+++ b/ethchain/transaction_test.go
@@ -2,8 +2,6 @@ package ethchain
 
 import (
 	"encoding/hex"
-	"fmt"
-	"github.com/ethereum/eth-go/ethutil"
 	"math/big"
 	"testing"
 )
@@ -42,13 +40,15 @@ func TestAddressRetrieval2(t *testing.T) {
 	tx.Sign(key)
 	//data, _ := hex.DecodeString("f85d8094944400f4b88ac9589a0f17ed4671da26bddb668b8203e8c01ca0363b2a410de00bc89be40f468d16e70e543b72191fbd8a684a7c5bef51dc451fa02d8ecf40b68f9c64ed623f6ee24c9c878943b812e1e76bd73ccb2bfef65579e7")
 	//tx := NewTransactionFromData(data)
-	fmt.Println(tx.RlpValue())
+	/*
+		fmt.Println(tx.RlpValue())
 
-	fmt.Printf("rlp %x\n", tx.RlpEncode())
-	fmt.Printf("sha rlp %x\n", tx.Hash())
+		fmt.Printf("rlp %x\n", tx.RlpEncode())
+		fmt.Printf("sha rlp %x\n", tx.Hash())
 
-	//tx.Sign(key)
+		//tx.Sign(key)
 
-	fmt.Printf("hex tx key %x\n", tx.PublicKey())
-	fmt.Printf("seder %x\n", tx.Sender())
+		fmt.Printf("hex tx key %x\n", tx.PublicKey())
+		fmt.Printf("seder %x\n", tx.Sender())
+	*/
 }
diff --git a/ethchain/vm.go b/ethchain/vm.go
new file mode 100644
index 000000000..c7a91a9c5
--- /dev/null
+++ b/ethchain/vm.go
@@ -0,0 +1,436 @@
+package ethchain
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/ethereum/eth-go/ethutil"
+	"github.com/obscuren/secp256k1-go"
+	"log"
+	"math"
+	"math/big"
+)
+
+type Vm struct {
+	txPool *TxPool
+	// Stack for processing contracts
+	stack *Stack
+	// non-persistent key/value memory storage
+	mem map[string]*big.Int
+
+	vars RuntimeVars
+}
+
+type RuntimeVars struct {
+	address     []byte
+	blockNumber uint64
+	sender      []byte
+	prevHash    []byte
+	coinbase    []byte
+	time        int64
+	diff        *big.Int
+	txValue     *big.Int
+	txData      []string
+}
+
+func (vm *Vm) Process(contract *Contract, state *State, vars RuntimeVars) {
+	vm.mem = make(map[string]*big.Int)
+	vm.stack = NewStack()
+
+	addr := vars.address // tx.Hash()[12:]
+	// Instruction pointer
+	pc := 0
+
+	if contract == nil {
+		fmt.Println("Contract not found")
+		return
+	}
+
+	Pow256 := ethutil.BigPow(2, 256)
+
+	if ethutil.Config.Debug {
+		ethutil.Config.Log.Debugf("#   op\n")
+	}
+
+	stepcount := 0
+	totalFee := new(big.Int)
+
+out:
+	for {
+		stepcount++
+		// The base big int for all calculations. Use this for any results.
+		base := new(big.Int)
+		val := contract.GetMem(pc)
+		//fmt.Printf("%x = %d, %v %x\n", r, len(r), v, nb)
+		op := OpCode(val.Uint())
+
+		var fee *big.Int = new(big.Int)
+		var fee2 *big.Int = new(big.Int)
+		if stepcount > 16 {
+			fee.Add(fee, StepFee)
+		}
+
+		// Calculate the fees
+		switch op {
+		case oSSTORE:
+			y, x := vm.stack.Peekn()
+			val := contract.Addr(ethutil.BigToBytes(x, 256))
+			if val.IsEmpty() && len(y.Bytes()) > 0 {
+				fee2.Add(DataFee, StoreFee)
+			} else {
+				fee2.Sub(DataFee, StoreFee)
+			}
+		case oSLOAD:
+			fee.Add(fee, StoreFee)
+		case oEXTRO, oBALANCE:
+			fee.Add(fee, ExtroFee)
+		case oSHA256, oRIPEMD160, oECMUL, oECADD, oECSIGN, oECRECOVER, oECVALID:
+			fee.Add(fee, CryptoFee)
+		case oMKTX:
+			fee.Add(fee, ContractFee)
+		}
+
+		tf := new(big.Int).Add(fee, fee2)
+		if contract.Amount.Cmp(tf) < 0 {
+			fmt.Println("Insufficient fees to continue running the contract", tf, contract.Amount)
+			break
+		}
+		// Add the fee to the total fee. It's subtracted when we're done looping
+		totalFee.Add(totalFee, tf)
+
+		if ethutil.Config.Debug {
+			ethutil.Config.Log.Debugf("%-3d %-4s", pc, op.String())
+		}
+
+		switch op {
+		case oSTOP:
+			fmt.Println("")
+			break out
+		case oADD:
+			x, y := vm.stack.Popn()
+			// (x + y) % 2 ** 256
+			base.Add(x, y)
+			base.Mod(base, Pow256)
+			// Pop result back on the stack
+			vm.stack.Push(base)
+		case oSUB:
+			x, y := vm.stack.Popn()
+			// (x - y) % 2 ** 256
+			base.Sub(x, y)
+			base.Mod(base, Pow256)
+			// Pop result back on the stack
+			vm.stack.Push(base)
+		case oMUL:
+			x, y := vm.stack.Popn()
+			// (x * y) % 2 ** 256
+			base.Mul(x, y)
+			base.Mod(base, Pow256)
+			// Pop result back on the stack
+			vm.stack.Push(base)
+		case oDIV:
+			x, y := vm.stack.Popn()
+			// floor(x / y)
+			base.Div(x, y)
+			// Pop result back on the stack
+			vm.stack.Push(base)
+		case oSDIV:
+			x, y := vm.stack.Popn()
+			// n > 2**255
+			if x.Cmp(Pow256) > 0 {
+				x.Sub(Pow256, x)
+			}
+			if y.Cmp(Pow256) > 0 {
+				y.Sub(Pow256, y)
+			}
+			z := new(big.Int)
+			z.Div(x, y)
+			if z.Cmp(Pow256) > 0 {
+				z.Sub(Pow256, z)
+			}
+			// Push result on to the stack
+			vm.stack.Push(z)
+		case oMOD:
+			x, y := vm.stack.Popn()
+			base.Mod(x, y)
+			vm.stack.Push(base)
+		case oSMOD:
+			x, y := vm.stack.Popn()
+			// n > 2**255
+			if x.Cmp(Pow256) > 0 {
+				x.Sub(Pow256, x)
+			}
+			if y.Cmp(Pow256) > 0 {
+				y.Sub(Pow256, y)
+			}
+			z := new(big.Int)
+			z.Mod(x, y)
+			if z.Cmp(Pow256) > 0 {
+				z.Sub(Pow256, z)
+			}
+			// Push result on to the stack
+			vm.stack.Push(z)
+		case oEXP:
+			x, y := vm.stack.Popn()
+			base.Exp(x, y, Pow256)
+
+			vm.stack.Push(base)
+		case oNEG:
+			base.Sub(Pow256, vm.stack.Pop())
+			vm.stack.Push(base)
+		case oLT:
+			x, y := vm.stack.Popn()
+			// x < y
+			if x.Cmp(y) < 0 {
+				vm.stack.Push(ethutil.BigTrue)
+			} else {
+				vm.stack.Push(ethutil.BigFalse)
+			}
+		case oLE:
+			x, y := vm.stack.Popn()
+			// x <= y
+			if x.Cmp(y) < 1 {
+				vm.stack.Push(ethutil.BigTrue)
+			} else {
+				vm.stack.Push(ethutil.BigFalse)
+			}
+		case oGT:
+			x, y := vm.stack.Popn()
+			// x > y
+			if x.Cmp(y) > 0 {
+				vm.stack.Push(ethutil.BigTrue)
+			} else {
+				vm.stack.Push(ethutil.BigFalse)
+			}
+		case oGE:
+			x, y := vm.stack.Popn()
+			// x >= y
+			if x.Cmp(y) > -1 {
+				vm.stack.Push(ethutil.BigTrue)
+			} else {
+				vm.stack.Push(ethutil.BigFalse)
+			}
+		case oNOT:
+			x, y := vm.stack.Popn()
+			// x != y
+			if x.Cmp(y) != 0 {
+				vm.stack.Push(ethutil.BigTrue)
+			} else {
+				vm.stack.Push(ethutil.BigFalse)
+			}
+		case oMYADDRESS:
+			vm.stack.Push(ethutil.BigD(addr))
+		case oTXSENDER:
+			vm.stack.Push(ethutil.BigD(vars.sender))
+		case oTXVALUE:
+			vm.stack.Push(vars.txValue)
+		case oTXDATAN:
+			vm.stack.Push(big.NewInt(int64(len(vars.txData))))
+		case oTXDATA:
+			v := vm.stack.Pop()
+			// v >= len(data)
+			if v.Cmp(big.NewInt(int64(len(vars.txData)))) >= 0 {
+				vm.stack.Push(ethutil.Big("0"))
+			} else {
+				vm.stack.Push(ethutil.Big(vars.txData[v.Uint64()]))
+			}
+		case oBLK_PREVHASH:
+			vm.stack.Push(ethutil.BigD(vars.prevHash))
+		case oBLK_COINBASE:
+			vm.stack.Push(ethutil.BigD(vars.coinbase))
+		case oBLK_TIMESTAMP:
+			vm.stack.Push(big.NewInt(vars.time))
+		case oBLK_NUMBER:
+			vm.stack.Push(big.NewInt(int64(vars.blockNumber)))
+		case oBLK_DIFFICULTY:
+			vm.stack.Push(vars.diff)
+		case oBASEFEE:
+			// e = 10^21
+			e := big.NewInt(0).Exp(big.NewInt(10), big.NewInt(21), big.NewInt(0))
+			d := new(big.Rat)
+			d.SetInt(vars.diff)
+			c := new(big.Rat)
+			c.SetFloat64(0.5)
+			// d = diff / 0.5
+			d.Quo(d, c)
+			// base = floor(d)
+			base.Div(d.Num(), d.Denom())
+
+			x := new(big.Int)
+			x.Div(e, base)
+
+			// x = floor(10^21 / floor(diff^0.5))
+			vm.stack.Push(x)
+		case oSHA256, oSHA3, oRIPEMD160:
+			// This is probably save
+			// ceil(pop / 32)
+			length := int(math.Ceil(float64(vm.stack.Pop().Uint64()) / 32.0))
+			// New buffer which will contain the concatenated popped items
+			data := new(bytes.Buffer)
+			for i := 0; i < length; i++ {
+				// Encode the number to bytes and have it 32bytes long
+				num := ethutil.NumberToBytes(vm.stack.Pop().Bytes(), 256)
+				data.WriteString(string(num))
+			}
+
+			if op == oSHA256 {
+				vm.stack.Push(base.SetBytes(ethutil.Sha256Bin(data.Bytes())))
+			} else if op == oSHA3 {
+				vm.stack.Push(base.SetBytes(ethutil.Sha3Bin(data.Bytes())))
+			} else {
+				vm.stack.Push(base.SetBytes(ethutil.Ripemd160(data.Bytes())))
+			}
+		case oECMUL:
+			y := vm.stack.Pop()
+			x := vm.stack.Pop()
+			//n := vm.stack.Pop()
+
+			//if ethutil.Big(x).Cmp(ethutil.Big(y)) {
+			data := new(bytes.Buffer)
+			data.WriteString(x.String())
+			data.WriteString(y.String())
+			if secp256k1.VerifyPubkeyValidity(data.Bytes()) == 1 {
+				// TODO
+			} else {
+				// Invalid, push infinity
+				vm.stack.Push(ethutil.Big("0"))
+				vm.stack.Push(ethutil.Big("0"))
+			}
+			//} else {
+			//	// Invalid, push infinity
+			//	vm.stack.Push("0")
+			//	vm.stack.Push("0")
+			//}
+
+		case oECADD:
+		case oECSIGN:
+		case oECRECOVER:
+		case oECVALID:
+		case oPUSH:
+			pc++
+			vm.stack.Push(contract.GetMem(pc).BigInt())
+		case oPOP:
+			// Pop current value of the stack
+			vm.stack.Pop()
+		case oDUP:
+			// Dup top stack
+			x := vm.stack.Pop()
+			vm.stack.Push(x)
+			vm.stack.Push(x)
+		case oSWAP:
+			// Swap two top most values
+			x, y := vm.stack.Popn()
+			vm.stack.Push(y)
+			vm.stack.Push(x)
+		case oMLOAD:
+			x := vm.stack.Pop()
+			vm.stack.Push(vm.mem[x.String()])
+		case oMSTORE:
+			x, y := vm.stack.Popn()
+			vm.mem[x.String()] = y
+		case oSLOAD:
+			// Load the value in storage and push it on the stack
+			x := vm.stack.Pop()
+			// decode the object as a big integer
+			decoder := ethutil.NewValueFromBytes([]byte(contract.State().Get(x.String())))
+			if !decoder.IsNil() {
+				vm.stack.Push(decoder.BigInt())
+			} else {
+				vm.stack.Push(ethutil.BigFalse)
+			}
+		case oSSTORE:
+			// Store Y at index X
+			y, x := vm.stack.Popn()
+			addr := ethutil.BigToBytes(x, 256)
+			fmt.Printf(" => %x (%v) @ %v", y.Bytes(), y, ethutil.BigD(addr))
+			contract.SetAddr(addr, y)
+			//contract.State().Update(string(idx), string(y))
+		case oJMP:
+			x := int(vm.stack.Pop().Uint64())
+			// Set pc to x - 1 (minus one so the incrementing at the end won't effect it)
+			pc = x
+			pc--
+		case oJMPI:
+			x := vm.stack.Pop()
+			// Set pc to x if it's non zero
+			if x.Cmp(ethutil.BigFalse) != 0 {
+				pc = int(x.Uint64())
+				pc--
+			}
+		case oIND:
+			vm.stack.Push(big.NewInt(int64(pc)))
+		case oEXTRO:
+			memAddr := vm.stack.Pop()
+			contractAddr := vm.stack.Pop().Bytes()
+
+			// Push the contract's memory on to the stack
+			vm.stack.Push(contractMemory(state, contractAddr, memAddr))
+		case oBALANCE:
+			// Pushes the balance of the popped value on to the stack
+			account := state.GetAccount(vm.stack.Pop().Bytes())
+			vm.stack.Push(account.Amount)
+		case oMKTX:
+			addr, value := vm.stack.Popn()
+			from, length := vm.stack.Popn()
+
+			makeInlineTx(addr.Bytes(), value, from, length, contract, state)
+		case oSUICIDE:
+			recAddr := vm.stack.Pop().Bytes()
+			// Purge all memory
+			deletedMemory := contract.state.NewIterator().Purge()
+			// Add refunds to the pop'ed address
+			refund := new(big.Int).Mul(StoreFee, big.NewInt(int64(deletedMemory)))
+			account := state.GetAccount(recAddr)
+			account.Amount.Add(account.Amount, refund)
+			// Update the refunding address
+			state.UpdateAccount(recAddr, account)
+			// Delete the contract
+			state.trie.Update(string(addr), "")
+
+			ethutil.Config.Log.Debugf("(%d) => %x\n", deletedMemory, recAddr)
+			break out
+		default:
+			fmt.Printf("Invalid OPCODE: %x\n", op)
+		}
+		ethutil.Config.Log.Debugln("")
+		//vm.stack.Print()
+		pc++
+	}
+
+	state.UpdateContract(addr, contract)
+}
+
+func makeInlineTx(addr []byte, value, from, length *big.Int, contract *Contract, state *State) {
+	ethutil.Config.Log.Debugf(" => creating inline tx %x %v %v %v", addr, value, from, length)
+	j := 0
+	dataItems := make([]string, int(length.Uint64()))
+	for i := from.Uint64(); i < length.Uint64(); i++ {
+		dataItems[j] = contract.GetMem(j).Str()
+		j++
+	}
+
+	tx := NewTransaction(addr, value, dataItems)
+	if tx.IsContract() {
+		contract := MakeContract(tx, state)
+		state.UpdateContract(tx.Hash()[12:], contract)
+	} else {
+		account := state.GetAccount(tx.Recipient)
+		account.Amount.Add(account.Amount, tx.Value)
+		state.UpdateAccount(tx.Recipient, account)
+	}
+}
+
+// Returns an address from the specified contract's address
+func contractMemory(state *State, contractAddr []byte, memAddr *big.Int) *big.Int {
+	contract := state.GetContract(contractAddr)
+	if contract == nil {
+		log.Panicf("invalid contract addr %x", contractAddr)
+	}
+	val := state.trie.Get(memAddr.String())
+
+	// decode the object as a big integer
+	decoder := ethutil.NewValueFromBytes([]byte(val))
+	if decoder.IsNil() {
+		return ethutil.BigFalse
+	}
+
+	return decoder.BigInt()
+}
diff --git a/ethchain/vm_test.go b/ethchain/vm_test.go
new file mode 100644
index 000000000..6ceb0ff15
--- /dev/null
+++ b/ethchain/vm_test.go
@@ -0,0 +1,106 @@
+package ethchain
+
+import (
+	"fmt"
+	"github.com/ethereum/eth-go/ethdb"
+	"github.com/ethereum/eth-go/ethutil"
+	"math/big"
+	"testing"
+)
+
+func TestRun(t *testing.T) {
+	InitFees()
+
+	ethutil.ReadConfig("")
+
+	db, _ := ethdb.NewMemDatabase()
+	state := NewState(ethutil.NewTrie(db, ""))
+
+	script := Compile([]string{
+		"TXSENDER",
+		"SUICIDE",
+	})
+
+	tx := NewTransaction(ContractAddr, big.NewInt(1e17), script)
+	fmt.Printf("contract addr %x\n", tx.Hash()[12:])
+	contract := MakeContract(tx, state)
+	vm := &Vm{}
+
+	vm.Process(contract, state, RuntimeVars{
+		address:     tx.Hash()[12:],
+		blockNumber: 1,
+		sender:      ethutil.FromHex("cd1722f3947def4cf144679da39c4c32bdc35681"),
+		prevHash:    ethutil.FromHex("5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"),
+		coinbase:    ethutil.FromHex("2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"),
+		time:        1,
+		diff:        big.NewInt(256),
+		txValue:     tx.Value,
+		txData:      tx.Data,
+	})
+}
+
+func TestRun1(t *testing.T) {
+	ethutil.ReadConfig("")
+
+	db, _ := ethdb.NewMemDatabase()
+	state := NewState(ethutil.NewTrie(db, ""))
+
+	script := Compile([]string{
+		"PUSH", "0",
+		"PUSH", "0",
+		"TXSENDER",
+		"PUSH", "10000000",
+		"MKTX",
+	})
+	fmt.Println(ethutil.NewValue(script))
+
+	tx := NewTransaction(ContractAddr, ethutil.Big("100000000000000000000000000000000000000000000000000"), script)
+	fmt.Printf("contract addr %x\n", tx.Hash()[12:])
+	contract := MakeContract(tx, state)
+	vm := &Vm{}
+
+	vm.Process(contract, state, RuntimeVars{
+		address:     tx.Hash()[12:],
+		blockNumber: 1,
+		sender:      ethutil.FromHex("cd1722f3947def4cf144679da39c4c32bdc35681"),
+		prevHash:    ethutil.FromHex("5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"),
+		coinbase:    ethutil.FromHex("2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"),
+		time:        1,
+		diff:        big.NewInt(256),
+		txValue:     tx.Value,
+		txData:      tx.Data,
+	})
+}
+
+func TestRun2(t *testing.T) {
+	ethutil.ReadConfig("")
+
+	db, _ := ethdb.NewMemDatabase()
+	state := NewState(ethutil.NewTrie(db, ""))
+
+	script := Compile([]string{
+		"PUSH", "0",
+		"PUSH", "0",
+		"TXSENDER",
+		"PUSH", "10000000",
+		"MKTX",
+	})
+	fmt.Println(ethutil.NewValue(script))
+
+	tx := NewTransaction(ContractAddr, ethutil.Big("100000000000000000000000000000000000000000000000000"), script)
+	fmt.Printf("contract addr %x\n", tx.Hash()[12:])
+	contract := MakeContract(tx, state)
+	vm := &Vm{}
+
+	vm.Process(contract, state, RuntimeVars{
+		address:     tx.Hash()[12:],
+		blockNumber: 1,
+		sender:      ethutil.FromHex("cd1722f3947def4cf144679da39c4c32bdc35681"),
+		prevHash:    ethutil.FromHex("5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"),
+		coinbase:    ethutil.FromHex("2adc25665018aa1fe0e6bc666dac8fc2697ff9ba"),
+		time:        1,
+		diff:        big.NewInt(256),
+		txValue:     tx.Value,
+		txData:      tx.Data,
+	})
+}
diff --git a/ethdb/database.go b/ethdb/database.go
index 76e4b4e4d..3dbff36de 100644
--- a/ethdb/database.go
+++ b/ethdb/database.go
@@ -11,8 +11,8 @@ type LDBDatabase struct {
 	db *leveldb.DB
 }
 
-func NewLDBDatabase() (*LDBDatabase, error) {
-	dbPath := path.Join(ethutil.Config.ExecPath, "database")
+func NewLDBDatabase(name string) (*LDBDatabase, error) {
+	dbPath := path.Join(ethutil.Config.ExecPath, name)
 
 	// Open the db
 	db, err := leveldb.OpenFile(dbPath, nil)
@@ -36,6 +36,14 @@ func (db *LDBDatabase) Get(key []byte) ([]byte, error) {
 	return db.db.Get(key, nil)
 }
 
+func (db *LDBDatabase) Delete(key []byte) error {
+	return db.db.Delete(key, nil)
+}
+
+func (db *LDBDatabase) Db() *leveldb.DB {
+	return db.db
+}
+
 func (db *LDBDatabase) LastKnownTD() []byte {
 	data, _ := db.db.Get([]byte("LastKnownTotalDifficulty"), nil)
 
@@ -46,13 +54,19 @@ func (db *LDBDatabase) LastKnownTD() []byte {
 	return data
 }
 
+func (db *LDBDatabase) GetKeys() []*ethutil.Key {
+	data, _ := db.Get([]byte("KeyRing"))
+
+	return []*ethutil.Key{ethutil.NewKeyFromBytes(data)}
+}
+
 func (db *LDBDatabase) Close() {
 	// Close the leveldb database
 	db.db.Close()
 }
 
 func (db *LDBDatabase) Print() {
-	iter := db.db.NewIterator(nil)
+	iter := db.db.NewIterator(nil, nil)
 	for iter.Next() {
 		key := iter.Key()
 		value := iter.Value()
diff --git a/ethdb/memory_database.go b/ethdb/memory_database.go
index cd9f24000..b0fa64ed7 100644
--- a/ethdb/memory_database.go
+++ b/ethdb/memory_database.go
@@ -26,6 +26,18 @@ func (db *MemDatabase) Get(key []byte) ([]byte, error) {
 	return db.db[string(key)], nil
 }
 
+func (db *MemDatabase) GetKeys() []*ethutil.Key {
+	data, _ := db.Get([]byte("KeyRing"))
+
+	return []*ethutil.Key{ethutil.NewKeyFromBytes(data)}
+}
+
+func (db *MemDatabase) Delete(key []byte) error {
+	delete(db.db, string(key))
+
+	return nil
+}
+
 func (db *MemDatabase) Print() {
 	for key, val := range db.db {
 		fmt.Printf("%x(%d): ", key, len(key))
diff --git a/ethereum.go b/ethereum.go
index bd6caac08..90682b396 100644
--- a/ethereum.go
+++ b/ethereum.go
@@ -47,6 +47,7 @@ type Ethereum struct {
 	Nonce uint64
 
 	Addr net.Addr
+	Port string
 
 	peerMut sync.Mutex
 
@@ -60,7 +61,7 @@ type Ethereum struct {
 }
 
 func New(caps Caps, usePnp bool) (*Ethereum, error) {
-	db, err := ethdb.NewLDBDatabase()
+	db, err := ethdb.NewLDBDatabase("database")
 	//db, err := ethdb.NewMemDatabase()
 	if err != nil {
 		return nil, err
@@ -70,7 +71,7 @@ func New(caps Caps, usePnp bool) (*Ethereum, error) {
 	if usePnp {
 		nat, err = Discover()
 		if err != nil {
-			log.Println("UPnP failed", err)
+			ethutil.Config.Log.Debugln("UPnP failed", err)
 		}
 	}
 
@@ -85,7 +86,6 @@ func New(caps Caps, usePnp bool) (*Ethereum, error) {
 		Nonce:        nonce,
 		serverCaps:   caps,
 		nat:          nat,
-		MaxPeers:     5,
 	}
 	ethereum.TxPool = ethchain.NewTxPool()
 	ethereum.TxPool.Speaker = ethereum
@@ -94,6 +94,9 @@ func New(caps Caps, usePnp bool) (*Ethereum, error) {
 	ethereum.TxPool.BlockManager = ethereum.BlockManager
 	ethereum.BlockManager.TransactionPool = ethereum.TxPool
 
+	// Start the tx pool
+	ethereum.TxPool.Start()
+
 	return ethereum, nil
 }
 
@@ -114,28 +117,32 @@ func (s *Ethereum) ProcessPeerList(addrs []string) {
 }
 
 func (s *Ethereum) ConnectToPeer(addr string) error {
-	var alreadyConnected bool
+	if s.peers.Len() < s.MaxPeers {
+		var alreadyConnected bool
 
-	eachPeer(s.peers, func(p *Peer, v *list.Element) {
-		if p.conn == nil {
-			return
-		}
-		phost, _, _ := net.SplitHostPort(p.conn.RemoteAddr().String())
-		ahost, _, _ := net.SplitHostPort(addr)
+		eachPeer(s.peers, func(p *Peer, v *list.Element) {
+			if p.conn == nil {
+				return
+			}
+			phost, _, _ := net.SplitHostPort(p.conn.RemoteAddr().String())
+			ahost, _, _ := net.SplitHostPort(addr)
 
-		if phost == ahost {
-			alreadyConnected = true
-			return
+			if phost == ahost {
+				alreadyConnected = true
+				return
+			}
+		})
+
+		if alreadyConnected {
+			return nil
 		}
-	})
 
-	if alreadyConnected {
-		return nil
-	}
+		peer := NewOutboundPeer(addr, s, s.serverCaps)
 
-	peer := NewOutboundPeer(addr, s, s.serverCaps)
+		s.peers.PushBack(peer)
 
-	s.peers.PushBack(peer)
+		log.Printf("[SERV] Adding peer %d / %d\n", s.peers.Len(), s.MaxPeers)
+	}
 
 	return nil
 }
@@ -226,12 +233,12 @@ func (s *Ethereum) ReapDeadPeerHandler() {
 // Start the ethereum
 func (s *Ethereum) Start() {
 	// Bind to addr and port
-	ln, err := net.Listen("tcp", ":30303")
+	ln, err := net.Listen("tcp", ":"+s.Port)
 	if err != nil {
 		log.Println("Connection listening disabled. Acting as client")
 	} else {
 		// Starting accepting connections
-		log.Println("Ready and accepting connections")
+		ethutil.Config.Log.Infoln("Ready and accepting connections")
 		// Start the peer handler
 		go s.peerHandler(ln)
 	}
@@ -243,13 +250,10 @@ func (s *Ethereum) Start() {
 	// Start the reaping processes
 	go s.ReapDeadPeerHandler()
 
-	// Start the tx pool
-	s.TxPool.Start()
-
 	if ethutil.Config.Seed {
-		log.Println("Seeding")
+		ethutil.Config.Log.Debugln("Seeding")
 		// Testnet seed bootstrapping
-		resp, err := http.Get("http://www.ethereum.org/servers.poc2.txt")
+		resp, err := http.Get("http://www.ethereum.org/servers.poc3.txt")
 		if err != nil {
 			log.Println("Fetching seed failed:", err)
 			return
@@ -269,7 +273,7 @@ func (s *Ethereum) peerHandler(listener net.Listener) {
 	for {
 		conn, err := listener.Accept()
 		if err != nil {
-			log.Println(err)
+			ethutil.Config.Log.Debugln(err)
 
 			continue
 		}
@@ -303,7 +307,7 @@ func (s *Ethereum) upnpUpdateThread() {
 	// Go off immediately to prevent code duplication, thereafter we renew
 	// lease every 15 minutes.
 	timer := time.NewTimer(0 * time.Second)
-	lport, _ := strconv.ParseInt("30303", 10, 16)
+	lport, _ := strconv.ParseInt(s.Port, 10, 16)
 	first := true
 out:
 	for {
@@ -312,13 +316,13 @@ out:
 			var err error
 			_, err = s.nat.AddPortMapping("TCP", int(lport), int(lport), "eth listen port", 20*60)
 			if err != nil {
-				log.Println("can't add UPnP port mapping:", err)
+				ethutil.Config.Log.Debugln("can't add UPnP port mapping:", err)
 				break out
 			}
 			if first && err == nil {
 				_, err = s.nat.GetExternalAddress()
 				if err != nil {
-					log.Println("UPnP can't get external address:", err)
+					ethutil.Config.Log.Debugln("UPnP can't get external address:", err)
 					continue out
 				}
 				first = false
@@ -332,8 +336,8 @@ out:
 	timer.Stop()
 
 	if err := s.nat.DeletePortMapping("TCP", int(lport), int(lport)); err != nil {
-		log.Println("unable to remove UPnP port mapping:", err)
+		ethutil.Config.Log.Debugln("unable to remove UPnP port mapping:", err)
 	} else {
-		log.Println("succesfully disestablished UPnP port mapping")
+		ethutil.Config.Log.Debugln("succesfully disestablished UPnP port mapping")
 	}
 }
diff --git a/ethutil/README.md b/ethutil/README.md
index c98612e1e..1ed56b71b 100644
--- a/ethutil/README.md
+++ b/ethutil/README.md
@@ -53,6 +53,8 @@ trie.Put("doge", "coin")
 // Look up the key "do" in the trie
 out := trie.Get("do")
 fmt.Println(out) // => verb
+
+trie.Delete("puppy")
 ```
 
 The patricia trie, in combination with RLP, provides a robust,
@@ -82,7 +84,7 @@ type (e.g. `Slice()` returns []interface{}, `Uint()` return 0, etc).
 `NewEmptyValue()` returns a new \*Value with it's initial value set to a
 `[]interface{}`
 
-`AppendLint()` appends a list to the current value.
+`AppendList()` appends a list to the current value.
 
 `Append(v)` appends the value (v) to the current value/list.
 
diff --git a/ethutil/big.go b/ethutil/big.go
index 979078bef..1a3902fa3 100644
--- a/ethutil/big.go
+++ b/ethutil/big.go
@@ -35,3 +35,18 @@ func BigD(data []byte) *big.Int {
 
 	return n
 }
+
+func BigToBytes(num *big.Int, base int) []byte {
+	ret := make([]byte, base/8)
+
+	return append(ret[:len(ret)-len(num.Bytes())], num.Bytes()...)
+}
+
+// Functions like the build in "copy" function
+// but works on big integers
+func BigCopy(src *big.Int) (ret *big.Int) {
+	ret = new(big.Int)
+	ret.Add(ret, src)
+
+	return
+}
diff --git a/ethutil/common.go b/ethutil/common.go
new file mode 100644
index 000000000..07df6bb13
--- /dev/null
+++ b/ethutil/common.go
@@ -0,0 +1,35 @@
+package ethutil
+
+import (
+	"fmt"
+	"math/big"
+)
+
+var (
+	Ether  = BigPow(10, 18)
+	Finney = BigPow(10, 15)
+	Szabo  = BigPow(10, 12)
+	Vito   = BigPow(10, 9)
+	Turing = BigPow(10, 6)
+	Eins   = BigPow(10, 3)
+	Wei    = big.NewInt(1)
+)
+
+func CurrencyToString(num *big.Int) string {
+	switch {
+	case num.Cmp(Ether) >= 0:
+		return fmt.Sprintf("%v Ether", new(big.Int).Div(num, Ether))
+	case num.Cmp(Finney) >= 0:
+		return fmt.Sprintf("%v Finney", new(big.Int).Div(num, Finney))
+	case num.Cmp(Szabo) >= 0:
+		return fmt.Sprintf("%v Szabo", new(big.Int).Div(num, Szabo))
+	case num.Cmp(Vito) >= 0:
+		return fmt.Sprintf("%v Vito", new(big.Int).Div(num, Vito))
+	case num.Cmp(Turing) >= 0:
+		return fmt.Sprintf("%v Turing", new(big.Int).Div(num, Turing))
+	case num.Cmp(Eins) >= 0:
+		return fmt.Sprintf("%v Eins", new(big.Int).Div(num, Eins))
+	}
+
+	return fmt.Sprintf("%v Wei", num)
+}
diff --git a/ethutil/common_test.go b/ethutil/common_test.go
new file mode 100644
index 000000000..3a6a37ff5
--- /dev/null
+++ b/ethutil/common_test.go
@@ -0,0 +1,17 @@
+package ethutil
+
+import (
+	"fmt"
+	"math/big"
+	"testing"
+)
+
+func TestCommon(t *testing.T) {
+	fmt.Println(CurrencyToString(BigPow(10, 19)))
+	fmt.Println(CurrencyToString(BigPow(10, 16)))
+	fmt.Println(CurrencyToString(BigPow(10, 13)))
+	fmt.Println(CurrencyToString(BigPow(10, 10)))
+	fmt.Println(CurrencyToString(BigPow(10, 7)))
+	fmt.Println(CurrencyToString(BigPow(10, 4)))
+	fmt.Println(CurrencyToString(big.NewInt(10)))
+}
diff --git a/ethutil/config.go b/ethutil/config.go
index 2a239f8e2..5bf56134d 100644
--- a/ethutil/config.go
+++ b/ethutil/config.go
@@ -1,6 +1,7 @@
 package ethutil
 
 import (
+	"fmt"
 	"log"
 	"os"
 	"os/user"
@@ -18,7 +19,7 @@ const (
 type config struct {
 	Db Database
 
-	Log      Logger
+	Log      *Logger
 	ExecPath string
 	Debug    bool
 	Ver      string
@@ -34,17 +35,19 @@ func ReadConfig(base string) *config {
 		usr, _ := user.Current()
 		path := path.Join(usr.HomeDir, base)
 
-		//Check if the logging directory already exists, create it if not
-		_, err := os.Stat(path)
-		if err != nil {
-			if os.IsNotExist(err) {
-				log.Printf("Debug logging directory %s doesn't exist, creating it", path)
-				os.Mkdir(path, 0777)
+		if len(base) > 0 {
+			//Check if the logging directory already exists, create it if not
+			_, err := os.Stat(path)
+			if err != nil {
+				if os.IsNotExist(err) {
+					log.Printf("Debug logging directory %s doesn't exist, creating it\n", path)
+					os.Mkdir(path, 0777)
+				}
 			}
 		}
 
-		Config = &config{ExecPath: path, Debug: true, Ver: "0.2.2"}
-		Config.Log = NewLogger(LogFile|LogStd, 0)
+		Config = &config{ExecPath: path, Debug: true, Ver: "0.3.0"}
+		Config.Log = NewLogger(LogFile|LogStd, LogLevelDebug)
 	}
 
 	return Config
@@ -57,15 +60,20 @@ const (
 	LogStd  = 0x2
 )
 
+type LogSystem interface {
+	Println(v ...interface{})
+	Printf(format string, v ...interface{})
+}
+
 type Logger struct {
-	logSys   []*log.Logger
+	logSys   []LogSystem
 	logLevel int
 }
 
-func NewLogger(flag LoggerType, level int) Logger {
-	var loggers []*log.Logger
+func NewLogger(flag LoggerType, level int) *Logger {
+	var loggers []LogSystem
 
-	flags := log.LstdFlags | log.Lshortfile
+	flags := log.LstdFlags
 
 	if flag&LogFile > 0 {
 		file, err := os.OpenFile(path.Join(Config.ExecPath, "debug.log"), os.O_RDWR|os.O_CREATE|os.O_APPEND, os.ModePerm)
@@ -73,30 +81,60 @@ func NewLogger(flag LoggerType, level int) Logger {
 			log.Panic("unable to create file logger", err)
 		}
 
-		log := log.New(file, "[ETH]", flags)
+		log := log.New(file, "", flags)
 
 		loggers = append(loggers, log)
 	}
 	if flag&LogStd > 0 {
-		log := log.New(os.Stdout, "[ETH]", flags)
+		log := log.New(os.Stdout, "", flags)
 		loggers = append(loggers, log)
 	}
 
-	return Logger{logSys: loggers, logLevel: level}
+	return &Logger{logSys: loggers, logLevel: level}
+}
+
+func (log *Logger) AddLogSystem(logger LogSystem) {
+	log.logSys = append(log.logSys, logger)
+}
+
+const (
+	LogLevelDebug = iota
+	LogLevelInfo
+)
+
+func (log *Logger) Debugln(v ...interface{}) {
+	if log.logLevel != LogLevelDebug {
+		return
+	}
+
+	for _, logger := range log.logSys {
+		logger.Println(v...)
+	}
+}
+
+func (log *Logger) Debugf(format string, v ...interface{}) {
+	if log.logLevel != LogLevelDebug {
+		return
+	}
+
+	for _, logger := range log.logSys {
+		logger.Printf(format, v...)
+	}
 }
 
-func (log Logger) Debugln(v ...interface{}) {
-	if log.logLevel != 0 {
+func (log *Logger) Infoln(v ...interface{}) {
+	if log.logLevel > LogLevelInfo {
 		return
 	}
 
+	fmt.Println(len(log.logSys))
 	for _, logger := range log.logSys {
 		logger.Println(v...)
 	}
 }
 
-func (log Logger) Debugf(format string, v ...interface{}) {
-	if log.logLevel != 0 {
+func (log *Logger) Infof(format string, v ...interface{}) {
+	if log.logLevel > LogLevelInfo {
 		return
 	}
 
diff --git a/ethutil/db.go b/ethutil/db.go
index 3681c4b05..abbf4a2b0 100644
--- a/ethutil/db.go
+++ b/ethutil/db.go
@@ -4,6 +4,8 @@ package ethutil
 type Database interface {
 	Put(key []byte, value []byte)
 	Get(key []byte) ([]byte, error)
+	GetKeys() []*Key
+	Delete(key []byte) error
 	LastKnownTD() []byte
 	Close()
 	Print()
diff --git a/ethutil/encoding.go b/ethutil/encoding.go
index 207548c93..1f661947a 100644
--- a/ethutil/encoding.go
+++ b/ethutil/encoding.go
@@ -3,7 +3,6 @@ package ethutil
 import (
 	"bytes"
 	"encoding/hex"
-	_ "fmt"
 	"strings"
 )
 
@@ -36,7 +35,7 @@ func CompactEncode(hexSlice []int) string {
 func CompactDecode(str string) []int {
 	base := CompactHexDecode(str)
 	base = base[:len(base)-1]
-	if base[0] >= 2 { // && base[len(base)-1] != 16 {
+	if base[0] >= 2 {
 		base = append(base, 16)
 	}
 	if base[0]%2 == 1 {
diff --git a/ethutil/encoding_test.go b/ethutil/encoding_test.go
index bcabab0b1..cbfbc0eaf 100644
--- a/ethutil/encoding_test.go
+++ b/ethutil/encoding_test.go
@@ -35,3 +35,33 @@ func TestCompactHexDecode(t *testing.T) {
 		t.Error("Error compact hex decode. Expected", exp, "got", res)
 	}
 }
+
+func TestCompactDecode(t *testing.T) {
+	exp := []int{1, 2, 3, 4, 5}
+	res := CompactDecode("\x11\x23\x45")
+
+	if !CompareIntSlice(res, exp) {
+		t.Error("odd compact decode. Expected", exp, "got", res)
+	}
+
+	exp = []int{0, 1, 2, 3, 4, 5}
+	res = CompactDecode("\x00\x01\x23\x45")
+
+	if !CompareIntSlice(res, exp) {
+		t.Error("even compact decode. Expected", exp, "got", res)
+	}
+
+	exp = []int{0, 15, 1, 12, 11, 8 /*term*/, 16}
+	res = CompactDecode("\x20\x0f\x1c\xb8")
+
+	if !CompareIntSlice(res, exp) {
+		t.Error("even terminated compact decode. Expected", exp, "got", res)
+	}
+
+	exp = []int{15, 1, 12, 11, 8 /*term*/, 16}
+	res = CompactDecode("\x3f\x1c\xb8")
+
+	if !CompareIntSlice(res, exp) {
+		t.Error("even terminated compact decode. Expected", exp, "got", res)
+	}
+}
\ No newline at end of file
diff --git a/ethutil/helpers.go b/ethutil/helpers.go
index 1c6adf256..aa0f79a04 100644
--- a/ethutil/helpers.go
+++ b/ethutil/helpers.go
@@ -27,7 +27,6 @@ func Ripemd160(data []byte) []byte {
 
 func Sha3Bin(data []byte) []byte {
 	d := sha3.NewKeccak256()
-	d.Reset()
 	d.Write(data)
 
 	return d.Sum(nil)
@@ -59,3 +58,7 @@ func MatchingNibbleLength(a, b []int) int {
 func Hex(d []byte) string {
 	return hex.EncodeToString(d)
 }
+func FromHex(str string) []byte {
+	h, _ := hex.DecodeString(str)
+	return h
+}
diff --git a/ethutil/key.go b/ethutil/key.go
new file mode 100644
index 000000000..ec195f213
--- /dev/null
+++ b/ethutil/key.go
@@ -0,0 +1,19 @@
+package ethutil
+
+type Key struct {
+	PrivateKey []byte
+	PublicKey  []byte
+}
+
+func NewKeyFromBytes(data []byte) *Key {
+	val := NewValueFromBytes(data)
+	return &Key{val.Get(0).Bytes(), val.Get(1).Bytes()}
+}
+
+func (k *Key) Address() []byte {
+	return Sha3Bin(k.PublicKey[1:])[12:]
+}
+
+func (k *Key) RlpEncode() []byte {
+	return EmptyValue().Append(k.PrivateKey).Append(k.PublicKey).Encode()
+}
diff --git a/ethutil/parsing.go b/ethutil/parsing.go
index 2c41fb4df..553bb9717 100644
--- a/ethutil/parsing.go
+++ b/ethutil/parsing.go
@@ -1,95 +1,88 @@
 package ethutil
 
 import (
-	"errors"
-	"fmt"
 	"math/big"
 	"strconv"
-	"strings"
 )
 
 // Op codes
-var OpCodes = map[string]string{
-	"STOP":      "0",
-	"ADD":       "1",
-	"MUL":       "2",
-	"SUB":       "3",
-	"DIV":       "4",
-	"SDIV":      "5",
-	"MOD":       "6",
-	"SMOD":      "7",
-	"EXP":       "8",
-	"NEG":       "9",
-	"LT":        "10",
-	"LE":        "11",
-	"GT":        "12",
-	"GE":        "13",
-	"EQ":        "14",
-	"NOT":       "15",
-	"MYADDRESS": "16",
-	"TXSENDER":  "17",
-
-	"PUSH": "48",
-	"POP":  "49",
-	"LOAD": "54",
+var OpCodes = map[string]byte{
+	"STOP":           0x00,
+	"ADD":            0x01,
+	"MUL":            0x02,
+	"SUB":            0x03,
+	"DIV":            0x04,
+	"SDIV":           0x05,
+	"MOD":            0x06,
+	"SMOD":           0x07,
+	"EXP":            0x08,
+	"NEG":            0x09,
+	"LT":             0x0a,
+	"LE":             0x0b,
+	"GT":             0x0c,
+	"GE":             0x0d,
+	"EQ":             0x0e,
+	"NOT":            0x0f,
+	"MYADDRESS":      0x10,
+	"TXSENDER":       0x11,
+	"TXVALUE":        0x12,
+	"TXDATAN":        0x13,
+	"TXDATA":         0x14,
+	"BLK_PREVHASH":   0x15,
+	"BLK_COINBASE":   0x16,
+	"BLK_TIMESTAMP":  0x17,
+	"BLK_NUMBER":     0x18,
+	"BLK_DIFFICULTY": 0x19,
+	"BLK_NONCE":      0x1a,
+	"BASEFEE":        0x1b,
+	"SHA256":         0x20,
+	"RIPEMD160":      0x21,
+	"ECMUL":          0x22,
+	"ECADD":          0x23,
+	"ECSIGN":         0x24,
+	"ECRECOVER":      0x25,
+	"ECVALID":        0x26,
+	"SHA3":           0x27,
+	"PUSH":           0x30,
+	"POP":            0x31,
+	"DUP":            0x32,
+	"SWAP":           0x33,
+	"MLOAD":          0x34,
+	"MSTORE":         0x35,
+	"SLOAD":          0x36,
+	"SSTORE":         0x37,
+	"JMP":            0x38,
+	"JMPI":           0x39,
+	"IND":            0x3a,
+	"EXTRO":          0x3b,
+	"BALANCE":        0x3c,
+	"MKTX":           0x3d,
+	"SUICIDE":        0x3f,
 }
 
-func CompileInstr(s string) (string, error) {
-	tokens := strings.Split(s, " ")
-	if OpCodes[tokens[0]] == "" {
-		return s, errors.New(fmt.Sprintf("OP not found: %s", tokens[0]))
+func IsOpCode(s string) bool {
+	for key, _ := range OpCodes {
+		if key == s {
+			return true
+		}
 	}
+	return false
+}
 
-	code := OpCodes[tokens[0]] // Replace op codes with the proper numerical equivalent
-	op := new(big.Int)
-	op.SetString(code, 0)
-
-	args := make([]*big.Int, 6)
-	for i, val := range tokens[1:len(tokens)] {
-		num := new(big.Int)
-		num.SetString(val, 0)
-		args[i] = num
-	}
-
-	// Big int equation = op + x * 256 + y * 256**2 + z * 256**3 + a * 256**4 + b * 256**5 + c * 256**6
-	base := new(big.Int)
-	x := new(big.Int)
-	y := new(big.Int)
-	z := new(big.Int)
-	a := new(big.Int)
-	b := new(big.Int)
-	c := new(big.Int)
-
-	if args[0] != nil {
-		x.Mul(args[0], big.NewInt(256))
-	}
-	if args[1] != nil {
-		y.Mul(args[1], BigPow(256, 2))
-	}
-	if args[2] != nil {
-		z.Mul(args[2], BigPow(256, 3))
-	}
-	if args[3] != nil {
-		a.Mul(args[3], BigPow(256, 4))
-	}
-	if args[4] != nil {
-		b.Mul(args[4], BigPow(256, 5))
-	}
-	if args[5] != nil {
-		c.Mul(args[5], BigPow(256, 6))
+func CompileInstr(s string) ([]byte, error) {
+	isOp := IsOpCode(s)
+	if isOp {
+		return []byte{OpCodes[s]}, nil
 	}
 
-	base.Add(op, x)
-	base.Add(base, y)
-	base.Add(base, z)
-	base.Add(base, a)
-	base.Add(base, b)
-	base.Add(base, c)
+	num := new(big.Int)
+	num.SetString(s, 0)
 
-	return base.String(), nil
+	return num.Bytes(), nil
 }
 
 func Instr(instr string) (int, []string, error) {
+
 	base := new(big.Int)
 	base.SetString(instr, 0)
 
diff --git a/ethutil/parsing_test.go b/ethutil/parsing_test.go
index 482eef3ee..6b59777e6 100644
--- a/ethutil/parsing_test.go
+++ b/ethutil/parsing_test.go
@@ -1,5 +1,6 @@
 package ethutil
 
+/*
 import (
 	"math"
 	"testing"
@@ -13,20 +14,19 @@ func TestCompile(t *testing.T) {
 	}
 
 	calc := (48 + 0*256 + 0*int64(math.Pow(256, 2)))
-	if Big(instr).Int64() != calc {
+	if BigD(instr).Int64() != calc {
 		t.Error("Expected", calc, ", got:", instr)
 	}
 }
 
 func TestValidInstr(t *testing.T) {
-	/*
 	  op, args, err := Instr("68163")
 	  if err != nil {
 	    t.Error("Error decoding instruction")
 	  }
-	*/
 
 }
 
 func TestInvalidInstr(t *testing.T) {
 }
+*/
diff --git a/ethutil/rlp.go b/ethutil/rlp.go
index 025d269a0..e633f5f1d 100644
--- a/ethutil/rlp.go
+++ b/ethutil/rlp.go
@@ -86,13 +86,6 @@ func DecodeWithReader(reader *bytes.Buffer) interface{} {
 // TODO Use a bytes.Buffer instead of a raw byte slice.
 // Cleaner code, and use draining instead of seeking the next bytes to read
 func Decode(data []byte, pos uint64) (interface{}, uint64) {
-	/*
-		if pos > uint64(len(data)-1) {
-			log.Println(data)
-			log.Panicf("index out of range %d for data %q, l = %d", pos, data, len(data))
-		}
-	*/
-
 	var slice []interface{}
 	char := int(data[pos])
 	switch {
@@ -131,7 +124,6 @@ func Decode(data []byte, pos uint64) (interface{}, uint64) {
 
 	case char <= 0xff:
 		l := uint64(data[pos]) - 0xf7
-		//b := BigD(data[pos+1 : pos+1+l]).Uint64()
 		b := ReadVarint(bytes.NewReader(data[pos+1 : pos+1+l]))
 
 		pos = pos + l + 1
diff --git a/ethutil/rlp_test.go b/ethutil/rlp_test.go
index 32bcbdce1..2a58bfc0f 100644
--- a/ethutil/rlp_test.go
+++ b/ethutil/rlp_test.go
@@ -2,15 +2,13 @@ package ethutil
 
 import (
 	"bytes"
-	"encoding/hex"
-	"fmt"
 	"math/big"
 	"reflect"
 	"testing"
 )
 
 func TestRlpValueEncoding(t *testing.T) {
-	val := EmptyRlpValue()
+	val := EmptyValue()
 	val.AppendList().Append(1).Append(2).Append(3)
 	val.Append("4").AppendList().Append(5)
 
@@ -63,7 +61,7 @@ func TestEncode(t *testing.T) {
 
 	str := string(bytes)
 	if str != strRes {
-		t.Error(fmt.Sprintf("Expected %q, got %q", strRes, str))
+		t.Errorf("Expected %q, got %q", strRes, str)
 	}
 
 	sliceRes := "\xcc\x83dog\x83god\x83cat"
@@ -71,7 +69,7 @@ func TestEncode(t *testing.T) {
 	bytes = Encode(strs)
 	slice := string(bytes)
 	if slice != sliceRes {
-		t.Error(fmt.Sprintf("Expected %q, got %q", sliceRes, slice))
+		t.Error("Expected %q, got %q", sliceRes, slice)
 	}
 
 	intRes := "\x82\x04\x00"
@@ -108,13 +106,9 @@ func TestEncodeDecodeBigInt(t *testing.T) {
 	encoded := Encode(bigInt)
 
 	value := NewValueFromBytes(encoded)
-	fmt.Println(value.BigInt(), bigInt)
 	if value.BigInt().Cmp(bigInt) != 0 {
 		t.Errorf("Expected %v, got %v", bigInt, value.BigInt())
 	}
-
-	dec, _ := hex.DecodeString("52f4fc1e")
-	fmt.Println(NewValueFromBytes(dec).BigInt())
 }
 
 func TestEncodeDecodeBytes(t *testing.T) {
@@ -125,43 +119,6 @@ func TestEncodeDecodeBytes(t *testing.T) {
 	}
 }
 
-/*
-var ZeroHash256 = make([]byte, 32)
-var ZeroHash160 = make([]byte, 20)
-var EmptyShaList = Sha3Bin(Encode([]interface{}{}))
-
-var GenisisHeader = []interface{}{
-	// Previous hash (none)
-	//"",
-	ZeroHash256,
-	// Sha of uncles
-	Sha3Bin(Encode([]interface{}{})),
-	// Coinbase
-	ZeroHash160,
-	// Root state
-	"",
-	// Sha of transactions
-	//EmptyShaList,
-	Sha3Bin(Encode([]interface{}{})),
-	// Difficulty
-	BigPow(2, 22),
-	// Time
-	//big.NewInt(0),
-	int64(0),
-	// extra
-	"",
-	// Nonce
-	big.NewInt(42),
-}
-
-func TestEnc(t *testing.T) {
-	//enc := Encode(GenisisHeader)
-	//fmt.Printf("%x (%d)\n", enc, len(enc))
-	h, _ := hex.DecodeString("f8a0a00000000000000000000000000000000000000000000000000000000000000000a01dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347940000000000000000000000000000000000000000a06d076baa9c4074fb2df222dd16a96b0155a1e6686b3e5748b4e9ca0a208a425ca01dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d493478340000080802a")
-	fmt.Printf("%x\n", Sha3Bin(h))
-}
-*/
-
 func BenchmarkEncodeDecode(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		bytes := Encode([]interface{}{"dog", "god", "cat"})
diff --git a/ethutil/trie.go b/ethutil/trie.go
index 0a3f73136..a17dc37ad 100644
--- a/ethutil/trie.go
+++ b/ethutil/trie.go
@@ -5,6 +5,15 @@ import (
 	"reflect"
 )
 
+// TODO
+// A StateObject is an object that has a state root
+// This is goig to be the object for the second level caching (the caching of object which have a state such as contracts)
+type StateObject interface {
+	State() *Trie
+	Sync()
+	Undo()
+}
+
 type Node struct {
 	Key   []byte
 	Value *Value
@@ -20,8 +29,9 @@ func (n *Node) Copy() *Node {
 }
 
 type Cache struct {
-	nodes map[string]*Node
-	db    Database
+	nodes   map[string]*Node
+	db      Database
+	IsDirty bool
 }
 
 func NewCache(db Database) *Cache {
@@ -36,6 +46,7 @@ func (cache *Cache) Put(v interface{}) interface{} {
 		sha := Sha3Bin(enc)
 
 		cache.nodes[string(sha)] = NewNode(sha, value, true)
+		cache.IsDirty = true
 
 		return sha
 	}
@@ -59,13 +70,25 @@ func (cache *Cache) Get(key []byte) *Value {
 	return value
 }
 
+func (cache *Cache) Delete(key []byte) {
+	delete(cache.nodes, string(key))
+
+	cache.db.Delete(key)
+}
+
 func (cache *Cache) Commit() {
+	// Don't try to commit if it isn't dirty
+	if !cache.IsDirty {
+		return
+	}
+
 	for key, node := range cache.nodes {
 		if node.Dirty {
 			cache.db.Put([]byte(key), node.Value.Encode())
 			node.Dirty = false
 		}
 	}
+	cache.IsDirty = false
 
 	// If the nodes grows beyond the 200 entries we simple empty it
 	// FIXME come up with something better
@@ -80,6 +103,7 @@ func (cache *Cache) Undo() {
 			delete(cache.nodes, key)
 		}
 	}
+	cache.IsDirty = false
 }
 
 // A (modified) Radix Trie implementation. The Trie implements
@@ -89,18 +113,29 @@ func (cache *Cache) Undo() {
 // Please note that the data isn't persisted unless `Sync` is
 // explicitly called.
 type Trie struct {
-	Root interface{}
+	prevRoot interface{}
+	Root     interface{}
 	//db   Database
 	cache *Cache
 }
 
 func NewTrie(db Database, Root interface{}) *Trie {
-	return &Trie{cache: NewCache(db), Root: Root}
+	return &Trie{cache: NewCache(db), Root: Root, prevRoot: Root}
 }
 
 // Save the cached value to the database.
 func (t *Trie) Sync() {
 	t.cache.Commit()
+	t.prevRoot = t.Root
+}
+
+func (t *Trie) Undo() {
+	t.cache.Undo()
+	t.Root = t.prevRoot
+}
+
+func (t *Trie) Cache() *Cache {
+	return t.cache
 }
 
 /*
@@ -119,6 +154,10 @@ func (t *Trie) Get(key string) string {
 	return c.Str()
 }
 
+func (t *Trie) Delete(key string) {
+	t.Update(key, "")
+}
+
 func (t *Trie) GetState(node interface{}, key []int) interface{} {
 	n := NewValue(node)
 	// Return the node if key is empty (= found)
@@ -168,13 +207,15 @@ func (t *Trie) GetNode(node interface{}) *Value {
 }
 
 func (t *Trie) UpdateState(node interface{}, key []int, value string) interface{} {
+
 	if value != "" {
 		return t.InsertState(node, key, value)
 	} else {
 		// delete it
+		return t.DeleteState(node, key)
 	}
 
-	return ""
+	return t.Root
 }
 
 func (t *Trie) Put(node interface{}) interface{} {
@@ -228,6 +269,7 @@ func (t *Trie) InsertState(node interface{}, key []int, value interface{}) inter
 	// Check for "special" 2 slice type node
 	if currentNode.Len() == 2 {
 		// Decode the key
+
 		k := CompactDecode(currentNode.Get(0).Str())
 		v := currentNode.Get(1).Raw()
 
@@ -282,6 +324,87 @@ func (t *Trie) InsertState(node interface{}, key []int, value interface{}) inter
 	return ""
 }
 
+func (t *Trie) DeleteState(node interface{}, key []int) interface{} {
+	if len(key) == 0 {
+		return ""
+	}
+
+	// New node
+	n := NewValue(node)
+	if node == nil || (n.Type() == reflect.String && (n.Str() == "" || n.Get(0).IsNil())) || n.Len() == 0 {
+		return ""
+	}
+
+	currentNode := t.GetNode(node)
+	// Check for "special" 2 slice type node
+	if currentNode.Len() == 2 {
+		// Decode the key
+		k := CompactDecode(currentNode.Get(0).Str())
+		v := currentNode.Get(1).Raw()
+
+		// Matching key pair (ie. there's already an object with this key)
+		if CompareIntSlice(k, key) {
+			return ""
+		} else if CompareIntSlice(key[:len(k)], k) {
+			hash := t.DeleteState(v, key[len(k):])
+			child := t.GetNode(hash)
+
+			var newNode []interface{}
+			if child.Len() == 2 {
+				newKey := append(k, CompactDecode(child.Get(0).Str())...)
+				newNode = []interface{}{CompactEncode(newKey), child.Get(1).Raw()}
+			} else {
+				newNode = []interface{}{currentNode.Get(0).Str(), hash}
+			}
+
+			return t.Put(newNode)
+		} else {
+			return node
+		}
+	} else {
+		// Copy the current node over to the new node and replace the first nibble in the key
+		n := EmptyStringSlice(17)
+		var newNode []interface{}
+
+		for i := 0; i < 17; i++ {
+			cpy := currentNode.Get(i).Raw()
+			if cpy != nil {
+				n[i] = cpy
+			}
+		}
+
+		n[key[0]] = t.DeleteState(n[key[0]], key[1:])
+		amount := -1
+		for i := 0; i < 17; i++ {
+			if n[i] != "" {
+				if amount == -1 {
+					amount = i
+				} else {
+					amount = -2
+				}
+			}
+		}
+		if amount == 16 {
+			newNode = []interface{}{CompactEncode([]int{16}), n[amount]}
+		} else if amount >= 0 {
+			child := t.GetNode(n[amount])
+			if child.Len() == 17 {
+				newNode = []interface{}{CompactEncode([]int{amount}), n[amount]}
+			} else if child.Len() == 2 {
+				key := append([]int{amount}, CompactDecode(child.Get(0).Str())...)
+				newNode = []interface{}{CompactEncode(key), child.Get(1).Str()}
+			}
+
+		} else {
+			newNode = n
+		}
+
+		return t.Put(newNode)
+	}
+
+	return ""
+}
+
 // Simple compare function which creates a rlp value out of the evaluated objects
 func (t *Trie) Cmp(trie *Trie) bool {
 	return NewValue(t.Root).Cmp(NewValue(trie.Root))
@@ -296,3 +419,82 @@ func (t *Trie) Copy() *Trie {
 
 	return trie
 }
+
+type TrieIterator struct {
+	trie  *Trie
+	key   string
+	value string
+
+	shas   [][]byte
+	values []string
+}
+
+func (t *Trie) NewIterator() *TrieIterator {
+	return &TrieIterator{trie: t}
+}
+
+// Some time in the near future this will need refactoring :-)
+// XXX Note to self, IsSlice == inline node. Str == sha3 to node
+func (it *TrieIterator) workNode(currentNode *Value) {
+	if currentNode.Len() == 2 {
+		k := CompactDecode(currentNode.Get(0).Str())
+
+		if currentNode.Get(1).Str() == "" {
+			it.workNode(currentNode.Get(1))
+		} else {
+			if k[len(k)-1] == 16 {
+				it.values = append(it.values, currentNode.Get(1).Str())
+			} else {
+				it.shas = append(it.shas, currentNode.Get(1).Bytes())
+				it.getNode(currentNode.Get(1).Bytes())
+			}
+		}
+	} else {
+		for i := 0; i < currentNode.Len(); i++ {
+			if i == 16 && currentNode.Get(i).Len() != 0 {
+				it.values = append(it.values, currentNode.Get(i).Str())
+			} else {
+				if currentNode.Get(i).Str() == "" {
+					it.workNode(currentNode.Get(i))
+				} else {
+					val := currentNode.Get(i).Str()
+					if val != "" {
+						it.shas = append(it.shas, currentNode.Get(1).Bytes())
+						it.getNode([]byte(val))
+					}
+				}
+			}
+		}
+	}
+}
+
+func (it *TrieIterator) getNode(node []byte) {
+	currentNode := it.trie.cache.Get(node)
+	it.workNode(currentNode)
+}
+
+func (it *TrieIterator) Collect() [][]byte {
+	if it.trie.Root == "" {
+		return nil
+	}
+
+	it.getNode(NewValue(it.trie.Root).Bytes())
+
+	return it.shas
+}
+
+func (it *TrieIterator) Purge() int {
+	shas := it.Collect()
+	for _, sha := range shas {
+		it.trie.cache.Delete(sha)
+	}
+	return len(it.values)
+}
+
+func (it *TrieIterator) Key() string {
+	return ""
+}
+
+func (it *TrieIterator) Value() string {
+	return ""
+}
diff --git a/ethutil/trie_test.go b/ethutil/trie_test.go
index b87d35e1a..7c398f1de 100644
--- a/ethutil/trie_test.go
+++ b/ethutil/trie_test.go
@@ -1,11 +1,12 @@
 package ethutil
 
 import (
-	_ "encoding/hex"
-	_ "fmt"
+	"reflect"
 	"testing"
 )
 
+const LONG_WORD = "1234567890abcdefghijklmnopqrstuvwxxzABCEFGHIJKLMNOPQRSTUVWXYZ"
+
 type MemDatabase struct {
 	db map[string][]byte
 }
@@ -20,15 +21,24 @@ func (db *MemDatabase) Put(key []byte, value []byte) {
 func (db *MemDatabase) Get(key []byte) ([]byte, error) {
 	return db.db[string(key)], nil
 }
+func (db *MemDatabase) Delete(key []byte) error {
+	delete(db.db, string(key))
+	return nil
+}
+func (db *MemDatabase) GetKeys() []*Key     { return nil }
 func (db *MemDatabase) Print()              {}
 func (db *MemDatabase) Close()              {}
 func (db *MemDatabase) LastKnownTD() []byte { return nil }
 
-func TestTrieSync(t *testing.T) {
+func New() (*MemDatabase, *Trie) {
 	db, _ := NewMemDatabase()
-	trie := NewTrie(db, "")
+	return db, NewTrie(db, "")
+}
 
-	trie.Update("dog", "kindofalongsentencewhichshouldbeencodedinitsentirety")
+func TestTrieSync(t *testing.T) {
+	db, trie := New()
+
+	trie.Update("dog", LONG_WORD)
 	if len(db.db) != 0 {
 		t.Error("Expected no data in database")
 	}
@@ -38,3 +48,125 @@ func TestTrieSync(t *testing.T) {
 		t.Error("Expected data to be persisted")
 	}
 }
+
+func TestTrieDirtyTracking(t *testing.T) {
+	_, trie := New()
+	trie.Update("dog", LONG_WORD)
+	if !trie.cache.IsDirty {
+		t.Error("Expected trie to be dirty")
+	}
+
+	trie.Sync()
+	if trie.cache.IsDirty {
+		t.Error("Expected trie not to be dirty")
+	}
+
+	trie.Update("test", LONG_WORD)
+	trie.cache.Undo()
+	if trie.cache.IsDirty {
+		t.Error("Expected trie not to be dirty")
+	}
+
+}
+
+func TestTrieReset(t *testing.T) {
+	_, trie := New()
+
+	trie.Update("cat", LONG_WORD)
+	if len(trie.cache.nodes) == 0 {
+		t.Error("Expected cached nodes")
+	}
+
+	trie.cache.Undo()
+
+	if len(trie.cache.nodes) != 0 {
+		t.Error("Expected no nodes after undo")
+	}
+}
+
+func TestTrieGet(t *testing.T) {
+	_, trie := New()
+
+	trie.Update("cat", LONG_WORD)
+	x := trie.Get("cat")
+	if x != LONG_WORD {
+		t.Error("expected %s, got %s", LONG_WORD, x)
+	}
+}
+
+func TestTrieUpdating(t *testing.T) {
+	_, trie := New()
+	trie.Update("cat", LONG_WORD)
+	trie.Update("cat", LONG_WORD+"1")
+	x := trie.Get("cat")
+	if x != LONG_WORD+"1" {
+		t.Error("expected %S, got %s", LONG_WORD+"1", x)
+	}
+}
+
+func TestTrieCmp(t *testing.T) {
+	_, trie1 := New()
+	_, trie2 := New()
+
+	trie1.Update("doge", LONG_WORD)
+	trie2.Update("doge", LONG_WORD)
+	if !trie1.Cmp(trie2) {
+		t.Error("Expected tries to be equal")
+	}
+
+	trie1.Update("dog", LONG_WORD)
+	trie2.Update("cat", LONG_WORD)
+	if trie1.Cmp(trie2) {
+		t.Errorf("Expected tries not to be equal %x %x", trie1.Root, trie2.Root)
+	}
+}
+
+func TestTrieDelete(t *testing.T) {
+	_, trie := New()
+	trie.Update("cat", LONG_WORD)
+	exp := trie.Root
+	trie.Update("dog", LONG_WORD)
+	trie.Delete("dog")
+	if !reflect.DeepEqual(exp, trie.Root) {
+		t.Errorf("Expected tries to be equal %x : %x", exp, trie.Root)
+	}
+
+	trie.Update("dog", LONG_WORD)
+	exp = trie.Root
+	trie.Update("dude", LONG_WORD)
+	trie.Delete("dude")
+	if !reflect.DeepEqual(exp, trie.Root) {
+		t.Errorf("Expected tries to be equal %x : %x", exp, trie.Root)
+	}
+}
+
+func TestTrieDeleteWithValue(t *testing.T) {
+	_, trie := New()
+	trie.Update("c", LONG_WORD)
+	exp := trie.Root
+	trie.Update("ca", LONG_WORD)
+	trie.Update("cat", LONG_WORD)
+	trie.Delete("ca")
+	trie.Delete("cat")
+	if !reflect.DeepEqual(exp, trie.Root) {
+		t.Errorf("Expected tries to be equal %x : %x", exp, trie.Root)
+	}
+
+}
+
+func TestTrieIterator(t *testing.T) {
+	_, trie := New()
+	trie.Update("c", LONG_WORD)
+	trie.Update("ca", LONG_WORD)
+	trie.Update("cat", LONG_WORD)
+
+	lenBefore := len(trie.cache.nodes)
+	it := trie.NewIterator()
+	if num := it.Purge(); num != 3 {
+		t.Errorf("Expected purge to return 3, got %d", num)
+	}
+
+	if lenBefore == len(trie.cache.nodes) {
+		t.Errorf("Expected cached nodes to be deleted")
+	}
+}
diff --git a/ethutil/value.go b/ethutil/value.go
index 2a990783e..3dd84d12d 100644
--- a/ethutil/value.go
+++ b/ethutil/value.go
@@ -36,7 +36,8 @@ func (val *Value) Len() int {
 	if data, ok := val.Val.([]interface{}); ok {
 		return len(data)
 	} else if data, ok := val.Val.([]byte); ok {
-		// FIXME
+		return len(data)
+	} else if data, ok := val.Val.(string); ok {
 		return len(data)
 	}
 
@@ -60,6 +61,10 @@ func (val *Value) Uint() uint64 {
 		return uint64(Val)
 	} else if Val, ok := val.Val.(uint64); ok {
 		return Val
+	} else if Val, ok := val.Val.(int); ok {
+		return uint64(Val)
+	} else if Val, ok := val.Val.(uint); ok {
+		return uint64(Val)
 	} else if Val, ok := val.Val.([]byte); ok {
 		return ReadVarint(bytes.NewReader(Val))
 	}
@@ -80,6 +85,8 @@ func (val *Value) BigInt() *big.Int {
 		b := new(big.Int).SetBytes(a)
 
 		return b
+	} else if a, ok := val.Val.(*big.Int); ok {
+		return a
 	} else {
 		return big.NewInt(int64(val.Uint()))
 	}
@@ -92,6 +99,8 @@ func (val *Value) Str() string {
 		return string(a)
 	} else if a, ok := val.Val.(string); ok {
 		return a
+	} else if a, ok := val.Val.(byte); ok {
+		return string(a)
 	}
 
 	return ""
@@ -102,7 +111,7 @@ func (val *Value) Bytes() []byte {
 		return a
 	}
 
-	return make([]byte, 0)
+	return []byte{}
 }
 
 func (val *Value) Slice() []interface{} {
@@ -131,6 +140,19 @@ func (val *Value) SliceFromTo(from, to int) *Value {
 	return NewValue(slice[from:to])
 }
 
+// TODO More type checking methods
+func (val *Value) IsSlice() bool {
+	return val.Type() == reflect.Slice
+}
+
+func (val *Value) IsStr() bool {
+	return val.Type() == reflect.String
+}
+
+func (val *Value) IsEmpty() bool {
+	return val.Val == nil || ((val.IsSlice() || val.IsStr()) && val.Len() == 0)
+}
+
 // Threat the value as a slice
 func (val *Value) Get(idx int) *Value {
 	if d, ok := val.Val.([]interface{}); ok {
@@ -140,7 +162,7 @@ func (val *Value) Get(idx int) *Value {
 		}
 
 		if idx < 0 {
-			panic("negative idx for Rlp Get")
+			panic("negative idx for Value Get")
 		}
 
 		return NewValue(d[idx])
@@ -158,9 +180,9 @@ func (val *Value) Encode() []byte {
 	return Encode(val.Val)
 }
 
-func NewValueFromBytes(rlpData []byte) *Value {
-	if len(rlpData) != 0 {
-		data, _ := Decode(rlpData, 0)
+func NewValueFromBytes(data []byte) *Value {
+	if len(data) != 0 {
+		data, _ := Decode(data, 0)
 		return NewValue(data)
 	}
 
diff --git a/ethutil/value_test.go b/ethutil/value_test.go
new file mode 100644
index 000000000..0e2da5328
--- /dev/null
+++ b/ethutil/value_test.go
@@ -0,0 +1,52 @@
+package ethutil
+
+import (
+	"bytes"
+	"math/big"
+	"testing"
+)
+
+func TestValueCmp(t *testing.T) {
+	val1 := NewValue("hello")
+	val2 := NewValue("world")
+	if val1.Cmp(val2) {
+		t.Error("Expected values not to be equal")
+	}
+
+	val3 := NewValue("hello")
+	val4 := NewValue("hello")
+	if !val3.Cmp(val4) {
+		t.Error("Expected values to be equal")
+	}
+}
+
+func TestValueTypes(t *testing.T) {
+	str := NewValue("str")
+	num := NewValue(1)
+	inter := NewValue([]interface{}{1})
+	byt := NewValue([]byte{1, 2, 3, 4})
+	bigInt := NewValue(big.NewInt(10))
+
+	if str.Str() != "str" {
+		t.Errorf("expected Str to return 'str', got %s", str.Str())
+	}
+
+	if num.Uint() != 1 {
+		t.Errorf("expected Uint to return '1', got %d", num.Uint())
+	}
+
+	interExp := []interface{}{1}
+	if !NewValue(inter.Interface()).Cmp(NewValue(interExp)) {
+		t.Errorf("expected Interface to return '%v', got %v", interExp, num.Interface())
+	}
+
+	bytExp := []byte{1, 2, 3, 4}
+	if bytes.Compare(byt.Bytes(), bytExp) != 0 {
+		t.Errorf("expected Bytes to return '%v', got %v", bytExp, byt.Bytes())
+	}
+
+	bigExp := big.NewInt(10)
+	if bigInt.BigInt().Cmp(bigExp) != 0 {
+		t.Errorf("expected BigInt to return '%v', got %v", bigExp, bigInt.BigInt())
+	}
+}
diff --git a/ethwire/messaging.go b/ethwire/messaging.go
index 651bf4710..185faa341 100644
--- a/ethwire/messaging.go
+++ b/ethwire/messaging.go
@@ -19,6 +19,9 @@ var MagicToken = []byte{34, 64, 8, 145}
 type MsgType byte
 
 const (
+	// Values are given explicitly instead of by iota because these values are
+	// defined by the wire protocol spec; it is easier for humans to ensure
+	// correctness when values are explicit.
 	MsgHandshakeTy  = 0x00
 	MsgDiscTy       = 0x01
 	MsgPingTy       = 0x02
diff --git a/peer.go b/peer.go
index 7b17b8b09..a8708206f 100644
--- a/peer.go
+++ b/peer.go
@@ -6,7 +6,6 @@ import (
 	"github.com/ethereum/eth-go/ethchain"
 	"github.com/ethereum/eth-go/ethutil"
 	"github.com/ethereum/eth-go/ethwire"
-	"log"
 	"net"
 	"runtime"
 	"strconv"
@@ -23,6 +22,9 @@ const (
 type DiscReason byte
 
 const (
+	// Values are given explicitly instead of by iota because these values are
+	// defined by the wire protocol spec; it is easier for humans to ensure
+	// correctness when values are explicit.
 	DiscReRequested  = 0x00
 	DiscReTcpSysErr  = 0x01
 	DiscBadProto     = 0x02
@@ -56,9 +58,9 @@ func (d DiscReason) String() string {
 type Caps byte
 
 const (
-	CapPeerDiscTy = 0x01
-	CapTxTy       = 0x02
-	CapChainTy    = 0x04
+	CapPeerDiscTy = 1 << iota
+	CapTxTy
+	CapChainTy
 
 	CapDefault = CapChainTy | CapTxTy | CapPeerDiscTy
 )
@@ -162,7 +164,7 @@ func NewOutboundPeer(addr string, ethereum *Ethereum, caps Caps) *Peer {
 		conn, err := net.DialTimeout("tcp", addr, 30*time.Second)
 
 		if err != nil {
-			log.Println("Connection to peer failed", err)
+			ethutil.Config.Log.Debugln("Connection to peer failed", err)
 			p.Stop()
 			return
 		}
@@ -199,7 +201,7 @@ func (p *Peer) writeMessage(msg *ethwire.Msg) {
 
 	err := ethwire.WriteMessage(p.conn, msg)
 	if err != nil {
-		log.Println("Can't send message:", err)
+		ethutil.Config.Log.Debugln("Can't send message:", err)
 		// Stop the client if there was an error writing to it
 		p.Stop()
 		return
@@ -261,7 +263,7 @@ func (p *Peer) HandleInbound() {
 		// Wait for a message from the peer
 		msgs, err := ethwire.ReadMessages(p.conn)
 		if err != nil {
-			log.Println(err)
+			ethutil.Config.Log.Debugln(err)
 		}
 		for _, msg := range msgs {
 			switch msg.Type {
@@ -274,7 +276,7 @@ func (p *Peer) HandleInbound() {
 				}
 			case ethwire.MsgDiscTy:
 				p.Stop()
-				log.Println("Disconnect peer:", DiscReason(msg.Data.Get(0).Uint()))
+				ethutil.Config.Log.Infoln("Disconnect peer:", DiscReason(msg.Data.Get(0).Uint()))
 			case ethwire.MsgPingTy:
 				// Respond back with pong
 				p.QueueMessage(ethwire.NewMessage(ethwire.MsgPongTy, ""))
@@ -285,7 +287,6 @@ func (p *Peer) HandleInbound() {
 				p.lastPong = time.Now().Unix()
 			case ethwire.MsgBlockTy:
 				// Get all blocks and process them
-				msg.Data = msg.Data
 				var block, lastBlock *ethchain.Block
 				var err error
 				for i := msg.Data.Len() - 1; i >= 0; i-- {
@@ -293,7 +294,10 @@ func (p *Peer) HandleInbound() {
 					err = p.ethereum.BlockManager.ProcessBlock(block)
 
 					if err != nil {
-						log.Println("bckmsg", err)
+						if ethutil.Config.Debug {
+							ethutil.Config.Log.Infof("[PEER] Block %x failed\n", block.Hash())
+							ethutil.Config.Log.Infof("[PEER] %v\n", err)
+						}
 						break
 					} else {
 						lastBlock = block
@@ -303,7 +307,7 @@ func (p *Peer) HandleInbound() {
 				if err != nil {
 					// If the parent is unknown try to catch up with this peer
 					if ethchain.IsParentErr(err) {
-						log.Println("Attempting to catch up")
+						ethutil.Config.Log.Infoln("Attempting to catch up")
 						p.catchingUp = false
 						p.CatchupWithPeer()
 					} else if ethchain.IsValidationErr(err) {
@@ -315,7 +319,7 @@ func (p *Peer) HandleInbound() {
 					if p.catchingUp && msg.Data.Len() > 1 {
 						if ethutil.Config.Debug && lastBlock != nil {
 							blockInfo := lastBlock.BlockInfo()
-							log.Printf("Synced to block height #%d %x %x\n", blockInfo.Number, lastBlock.Hash(), blockInfo.Hash)
+							ethutil.Config.Log.Infof("Synced to block height #%d %x %x\n", blockInfo.Number, lastBlock.Hash(), blockInfo.Hash)
 						}
 						p.catchingUp = false
 						p.CatchupWithPeer()
@@ -386,12 +390,12 @@ func (p *Peer) HandleInbound() {
 					p.QueueMessage(ethwire.NewMessage(ethwire.MsgNotInChainTy, []interface{}{lastHash.Raw()}))
 				}
 			case ethwire.MsgNotInChainTy:
-				log.Printf("Not in chain %x\n", msg.Data)
+				ethutil.Config.Log.Infof("Not in chain %x\n", msg.Data)
 				// TODO
 
 				// Unofficial but fun nonetheless
 			case ethwire.MsgTalkTy:
-				log.Printf("%v says: %s\n", p.conn.RemoteAddr(), msg.Data.Str())
+				ethutil.Config.Log.Infoln("%v says: %s\n", p.conn.RemoteAddr(), msg.Data.Str())
 			}
 		}
 	}
@@ -434,7 +438,7 @@ func (p *Peer) Start() {
 
 	err := p.pushHandshake()
 	if err != nil {
-		log.Printf("Peer can't send outbound version ack", err)
+		ethutil.Config.Log.Debugln("Peer can't send outbound version ack", err)
 
 		p.Stop()
 
@@ -465,7 +469,7 @@ func (p *Peer) pushHandshake() error {
 	pubkey := ethutil.NewValueFromBytes(data).Get(2).Bytes()
 
 	msg := ethwire.NewMessage(ethwire.MsgHandshakeTy, []interface{}{
-		uint32(4), uint32(0), p.Version, byte(p.caps), p.port, pubkey,
+		uint32(5), uint32(0), p.Version, byte(p.caps), p.port, pubkey,
 	})
 
 	p.QueueMessage(msg)
@@ -492,8 +496,8 @@ func (p *Peer) pushPeers() {
 func (p *Peer) handleHandshake(msg *ethwire.Msg) {
 	c := msg.Data
 
-	if c.Get(0).Uint() != 4 {
-		log.Println("Invalid peer version. Require protocol v4")
+	if c.Get(0).Uint() != 5 {
+		ethutil.Config.Log.Debugln("Invalid peer version. Require protocol v5")
 		p.Stop()
 		return
 	}
@@ -525,7 +529,7 @@ func (p *Peer) handleHandshake(msg *ethwire.Msg) {
 	// Get a reference to the peers version
 	p.Version = c.Get(2).Str()
 
-	log.Println(p)
+	ethutil.Config.Log.Debugln("[PEER]", p)
 }
 
 func (p *Peer) String() string {
@@ -542,7 +546,7 @@ func (p *Peer) String() string {
 		strConnectType = "disconnected"
 	}
 
-	return fmt.Sprintf("peer [%s] (%s) %v %s [%s]", strConnectType, strBoundType, p.conn.RemoteAddr(), p.Version, p.caps)
+	return fmt.Sprintf("[%s] (%s) %v %s [%s]", strConnectType, strBoundType, p.conn.RemoteAddr(), p.Version, p.caps)
 
 }
 
@@ -552,7 +556,7 @@ func (p *Peer) CatchupWithPeer() {
 		msg := ethwire.NewMessage(ethwire.MsgGetChainTy, []interface{}{p.ethereum.BlockManager.BlockChain().CurrentBlock.Hash(), uint64(50)})
 		p.QueueMessage(msg)
 
-		log.Printf("Requesting blockchain %x...\n", p.ethereum.BlockManager.BlockChain().CurrentBlock.Hash()[:4])
+		ethutil.Config.Log.Debugf("Requesting blockchain %x...\n", p.ethereum.BlockManager.BlockChain().CurrentBlock.Hash()[:4])
 	}
 }