Merge pull request #194 from ethereum/poc8

Update tests branch to PoC8
2014-11-27 13:23:31 +01:00 · 2014-11-27 13:23:31 +01:00 · ef7961b7d2
parent c17a3cb0ce 8cf9ed0ea5
commit ef7961b7d2
61 changed files with 5388 additions and 1139 deletions
--- a/README.md
+++ b/README.md
@ -36,65 +36,11 @@ Automated (dev) builds
 * [Windows] Coming soon&trade;
 * [Linux] Coming soon&trade;

-Packages
+Binaries
 ========

-Ethereum Go is split up in several sub packages Please refer to each
-individual package for more information.
-  1. [eth](https://github.com/ethereum/go-ethereum)
-  2. [ethchain](https://github.com/ethereum/go-ethereum/tree/master/ethchain)
-  3. [ethwire](https://github.com/ethereum/go-ethereum/tree/master/ethwire)
-  4. [ethdb](https://github.com/ethereum/go-ethereum/tree/master/ethdb)
-  5. [ethutil](https://github.com/ethereum/go-ethereum/tree/master/ethutil)
-  6. [ethpipe](https://github.com/ethereum/go-ethereum/tree/master/ethpipe)
-  7. [ethvm](https://github.com/ethereum/go-ethereum/tree/master/ethvm)
-  8. [ethtrie](https://github.com/ethereum/go-ethereum/tree/master/ethtrie)
-  9. [ethreact](https://github.com/ethereum/go-ethereum/tree/master/ethreact)
-  10. [ethlog](https://github.com/ethereum/go-ethereum/tree/master/ethlog)
-
-The [eth](https://github.com/ethereum/go-ethereum) is the top-level package
-of the Ethereum protocol. It functions as the Ethereum bootstrapping and
-peer communication layer. The [ethchain](https://github.com/ethereum/go-ethereum/tree/master/ethchain)
-contains the Ethereum blockchain, block manager, transaction and
-transaction handlers. The [ethwire](https://github.com/ethereum/go-ethereum/tree/master/ethwire) contains
-the Ethereum [wire protocol](http://wiki.ethereum.org/index.php/Wire_Protocol) which can be used
-to hook in to the Ethereum network. [ethutil](https://github.com/ethereum/go-ethereum/tree/master/ethutil) contains
-utility functions which are not Ethereum specific. The utility package
-contains the [patricia trie](http://wiki.ethereum.org/index.php/Patricia_Tree),
-[RLP Encoding](http://wiki.ethereum.org/index.php/RLP) and hex encoding
-helpers. The [ethdb](https://github.com/ethereum/go-ethereum/tree/master/ethdb) package
-contains the LevelDB interface and memory DB interface.
-
-General command line options
-============================
-
-```
-Shared between ethereum and Mist
-id      Set the custom identifier of the client (shows up on other clients)
-port    Port on which the server will accept incomming connections
-upnp    Enable UPnP
-maxpeer Desired amount of peers
-rpc     Start JSON RPC
-
-dir     Data directory used to store configs and databases
-import  Import a private key
-genaddr Generates a new address and private key (destructive action)
-h       This
-
-Ethereum only
-ethereum [options] [filename]
-js        Start the JavaScript REPL
-filename   Load the given file and interpret as JavaScript
-m       Start mining blocks
-
-Mist only
-asset_path    absolute path to GUI assets directory
-```
-
-Tools
-=====
-
-Go Ethereum comes with several binaries:
+Go Ethereum comes with several binaries found in
+[cmd](https://github.com/ethereum/go-ethereum/tree/master/cmd):

 * `mist` Official Ethereum Browser
 * `ethereum` Ethereum CLI
@ -103,6 +49,38 @@ Go Ethereum comes with several binaries:
 * `evm` is a generic Ethereum Virtual Machine: `evm -code 60ff60ff -gas
  10000 -price 0 -dump`. See `-h` for a detailed description.

+General command line options
+============================
+
+```
+== Shared between ethereum and Mist ==
+
+= Settings
+-id      Set the custom identifier of the client (shows up on other clients)
+-port    Port on which the server will accept incomming connections
+-upnp    Enable UPnP
+-maxpeer Desired amount of peers
+-rpc     Start JSON RPC
+-dir     Data directory used to store configs and databases
+
+= Utility 
+-h         This
+-import    Import a private key
+-genaddr   Generates a new address and private key (destructive action)
+-dump      Dump a specific state of a block to stdout given the -number or -hash
+-difftool  Supress all output and prints VM output to stdout
+-diff      vm=only vm output, all=all output including state storage
+
+Ethereum only
+ethereum [options] [filename]
+-js        Start the JavaScript REPL
+filename   Load the given file and interpret as JavaScript
+-m       Start mining blocks
+
+== Mist only ==
+
+-asset_path    absolute path to GUI assets directory
+```

 Contribution
 ============
--- a/block_pool.go
+++ b/block_pool.go
@ -10,8 +10,10 @@ import (
 	"time"

 	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/state"
 	"github.com/ethereum/go-ethereum/wire"
 )

@ -20,7 +22,7 @@ var poollogger = logger.NewLogger("BPOOL")
 type block struct {
 	from      *Peer
 	peer      *Peer
-	block     *chain.Block
+	block     *types.Block
 	reqAt     time.Time
 	requested int
 }
@ -73,7 +75,7 @@ func (self *BlockPool) HasCommonHash(hash []byte) bool {
 	return self.eth.ChainManager().GetBlock(hash) != nil
 }

-func (self *BlockPool) Blocks() (blocks chain.Blocks) {
+func (self *BlockPool) Blocks() (blocks types.Blocks) {
 	for _, item := range self.pool {
 		if item.block != nil {
 			blocks = append(blocks, item.block)
@ -123,15 +125,15 @@ func (self *BlockPool) AddHash(hash []byte, peer *Peer) {
 	}
 }

-func (self *BlockPool) Add(b *chain.Block, peer *Peer) {
+func (self *BlockPool) Add(b *types.Block, peer *Peer) {
 	self.addBlock(b, peer, false)
 }

-func (self *BlockPool) AddNew(b *chain.Block, peer *Peer) {
+func (self *BlockPool) AddNew(b *types.Block, peer *Peer) {
 	self.addBlock(b, peer, true)
 }

-func (self *BlockPool) addBlock(b *chain.Block, peer *Peer, newBlock bool) {
+func (self *BlockPool) addBlock(b *types.Block, peer *Peer, newBlock bool) {
 	self.mut.Lock()
 	defer self.mut.Unlock()

@ -283,7 +285,7 @@ out:
 			break out
 		case <-procTimer.C:
 			blocks := self.Blocks()
-			chain.BlockBy(chain.Number).Sort(blocks)
+			types.BlockBy(types.Number).Sort(blocks)

 			// Find common block
 			for i, block := range blocks {
@ -309,10 +311,6 @@ out:
 				}
 			}

-			// TODO figure out whether we were catching up
-			// If caught up and just a new block has been propagated:
-			// sm.eth.EventMux().Post(NewBlockEvent{block})
-			// otherwise process and don't emit anything
 			if len(blocks) > 0 {
 				chainManager := self.eth.ChainManager()
 				// Test and import
@ -333,9 +331,14 @@ out:
 					self.td = ethutil.Big0
 					self.peer = nil
 				} else {
-					chainManager.InsertChain(bchain)
-					for _, block := range blocks {
-						self.Remove(block.Hash())
+					if !chain.IsTDError(err) {
+						chainManager.InsertChain(bchain, func(block *types.Block, messages state.Messages) {
+							self.eth.EventMux().Post(chain.NewBlockEvent{block})
+							self.eth.EventMux().Post(messages)
+
+							self.Remove(block.Hash())
+						})
+
 					}
 				}
 			}
--- a/chain/block_manager.go
+++ b/chain/block_manager.go
@ -9,6 +9,7 @@ import (
 	"sync"
 	"time"

+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/event"
@ -69,7 +70,7 @@ type BlockManager struct {
 	// The last attempted block is mainly used for debugging purposes
 	// This does not have to be a valid block and will be set during
 	// 'Process' & canonical validation.
-	lastAttemptedBlock *Block
+	lastAttemptedBlock *types.Block

 	events event.Subscription
 }
@ -117,11 +118,11 @@ func (sm *BlockManager) ChainManager() *ChainManager {
 	return sm.bc
 }

-func (self *BlockManager) ProcessTransactions(coinbase *state.StateObject, state *state.State, block, parent *Block, txs Transactions) (Receipts, Transactions, Transactions, Transactions, error) {
+func (self *BlockManager) ProcessTransactions(coinbase *state.StateObject, state *state.State, block, parent *types.Block, txs types.Transactions) (types.Receipts, types.Transactions, types.Transactions, types.Transactions, error) {
 	var (
-		receipts           Receipts
-		handled, unhandled Transactions
-		erroneous          Transactions
+		receipts           types.Receipts
+		handled, unhandled types.Transactions
+		erroneous          types.Transactions
 		totalUsedGas       = big.NewInt(0)
 		err                error
 	)
@ -159,8 +160,9 @@ done:

 		txGas.Sub(txGas, st.gas)
 		cumulative := new(big.Int).Set(totalUsedGas.Add(totalUsedGas, txGas))
-		receipt := &Receipt{ethutil.CopyBytes(state.Root()), cumulative, nil /*bloom*/, state.Logs()}
-		receipt.Bloom = CreateBloom(Receipts{receipt})
+		receipt := types.NewReceipt(state.Root(), cumulative)
+		receipt.SetLogs(state.Logs())
+		receipt.Bloom = types.CreateBloom(types.Receipts{receipt})

 		// Notify all subscribers
 		go self.eth.EventMux().Post(TxPostEvent{tx})
@ -178,7 +180,7 @@ done:
 	return receipts, handled, unhandled, erroneous, err
 }

-func (sm *BlockManager) Process(block *Block) (td *big.Int, msgs state.Messages, err error) {
+func (sm *BlockManager) Process(block *types.Block) (td *big.Int, msgs state.Messages, err error) {
 	// Processing a blocks may never happen simultaneously
 	sm.mutex.Lock()
 	defer sm.mutex.Unlock()
@ -195,7 +197,7 @@ func (sm *BlockManager) Process(block *Block) (td *big.Int, msgs state.Messages,
 	return sm.ProcessWithParent(block, parent)
 }

-func (sm *BlockManager) ProcessWithParent(block, parent *Block) (td *big.Int, messages state.Messages, err error) {
+func (sm *BlockManager) ProcessWithParent(block, parent *types.Block) (td *big.Int, messages state.Messages, err error) {
 	sm.lastAttemptedBlock = block

 	state := parent.State().Copy()
@ -215,13 +217,13 @@ func (sm *BlockManager) ProcessWithParent(block, parent *Block) (td *big.Int, me
 		return
 	}

-	txSha := DeriveSha(block.transactions)
+	txSha := types.DeriveSha(block.Transactions())
 	if bytes.Compare(txSha, block.TxSha) != 0 {
 		err = fmt.Errorf("validating transaction root. received=%x got=%x", block.TxSha, txSha)
 		return
 	}

-	receiptSha := DeriveSha(receipts)
+	receiptSha := types.DeriveSha(receipts)
 	if bytes.Compare(receiptSha, block.ReceiptSha) != 0 {
 		err = fmt.Errorf("validating receipt root. received=%x got=%x", block.ReceiptSha, receiptSha)
 		return
@ -238,8 +240,8 @@ func (sm *BlockManager) ProcessWithParent(block, parent *Block) (td *big.Int, me
 		return
 	}

-	block.receipts = receipts // although this isn't necessary it be in the future
-	rbloom := CreateBloom(receipts)
+	//block.receipts = receipts // although this isn't necessary it be in the future
+	rbloom := types.CreateBloom(receipts)
 	if bytes.Compare(rbloom, block.LogsBloom) != 0 {
 		err = fmt.Errorf("unable to replicate block's bloom=%x", rbloom)
 		return
@ -272,7 +274,7 @@ func (sm *BlockManager) ProcessWithParent(block, parent *Block) (td *big.Int, me
 	}
 }

-func (sm *BlockManager) ApplyDiff(state *state.State, parent, block *Block) (receipts Receipts, err error) {
+func (sm *BlockManager) ApplyDiff(state *state.State, parent, block *types.Block) (receipts types.Receipts, err error) {
 	coinbase := state.GetOrNewStateObject(block.Coinbase)
 	coinbase.SetGasPool(block.CalcGasLimit(parent))

@ -285,7 +287,7 @@ func (sm *BlockManager) ApplyDiff(state *state.State, parent, block *Block) (rec
 	return receipts, nil
 }

-func (sm *BlockManager) CalculateTD(block *Block) (*big.Int, bool) {
+func (sm *BlockManager) CalculateTD(block *types.Block) (*big.Int, bool) {
 	uncleDiff := new(big.Int)
 	for _, uncle := range block.Uncles {
 		uncleDiff = uncleDiff.Add(uncleDiff, uncle.Difficulty)
@ -311,7 +313,7 @@ func (sm *BlockManager) CalculateTD(block *Block) (*big.Int, bool) {
 // Validates the current block. Returns an error if the block was invalid,
 // an uncle or anything that isn't on the current block chain.
 // Validation validates easy over difficult (dagger takes longer time = difficult)
-func (sm *BlockManager) ValidateBlock(block, parent *Block) error {
+func (sm *BlockManager) ValidateBlock(block, parent *types.Block) error {
 	expd := CalcDifficulty(block, parent)
 	if expd.Cmp(block.Difficulty) < 0 {
 		return fmt.Errorf("Difficulty check failed for block %v, %v", block.Difficulty, expd)
@ -337,7 +339,7 @@ func (sm *BlockManager) ValidateBlock(block, parent *Block) error {
 	return nil
 }

-func (sm *BlockManager) AccumelateRewards(state *state.State, block, parent *Block) error {
+func (sm *BlockManager) AccumelateRewards(state *state.State, block, parent *types.Block) error {
 	reward := new(big.Int).Set(BlockReward)

 	knownUncles := ethutil.Set(parent.Uncles)
@ -380,7 +382,7 @@ func (sm *BlockManager) AccumelateRewards(state *state.State, block, parent *Blo
 	return nil
 }

-func (sm *BlockManager) GetMessages(block *Block) (messages []*state.Message, err error) {
+func (sm *BlockManager) GetMessages(block *types.Block) (messages []*state.Message, err error) {
 	if !sm.bc.HasBlock(block.PrevHash) {
 		return nil, ParentError(block.PrevHash)
 	}
--- a/chain/chain_manager.go
+++ b/chain/chain_manager.go
@ -6,6 +6,7 @@ import (
 	"fmt"
 	"math/big"

+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/state"
@ -13,36 +14,88 @@ import (

 var chainlogger = logger.NewLogger("CHAIN")

+func AddTestNetFunds(block *types.Block) {
+	for _, addr := range []string{
+		"51ba59315b3a95761d0863b05ccc7a7f54703d99",
+		"e4157b34ea9615cfbde6b4fda419828124b70c78",
+		"b9c015918bdaba24b4ff057a92a3873d6eb201be",
+		"6c386a4b26f73c802f34673f7248bb118f97424a",
+		"cd2a3d9f938e13cd947ec05abc7fe734df8dd826",
+		"2ef47100e0787b915105fd5e3f4ff6752079d5cb",
+		"e6716f9544a56c530d868e4bfbacb172315bdead",
+		"1a26338f0d905e295fccb71fa9ea849ffa12aaf4",
+	} {
+		codedAddr := ethutil.Hex2Bytes(addr)
+		account := block.State().GetAccount(codedAddr)
+		account.SetBalance(ethutil.Big("1606938044258990275541962092341162602522202993782792835301376")) //ethutil.BigPow(2, 200)
+		block.State().UpdateStateObject(account)
+	}
+}
+
+func CalcDifficulty(block, parent *types.Block) *big.Int {
+	diff := new(big.Int)
+
+	adjust := new(big.Int).Rsh(parent.Difficulty, 10)
+	if block.Time >= parent.Time+5 {
+		diff.Sub(parent.Difficulty, adjust)
+	} else {
+		diff.Add(parent.Difficulty, adjust)
+	}
+
+	return diff
+}
+
 type ChainManager struct {
-	Ethereum EthManager
-	// The famous, the fabulous Mister GENESIIIIIIS (block)
-	genesisBlock *Block
+	//eth          EthManager
+	processor    types.BlockProcessor
+	genesisBlock *types.Block
 	// Last known total difficulty
 	TD *big.Int

 	LastBlockNumber uint64

-	CurrentBlock  *Block
+	CurrentBlock  *types.Block
 	LastBlockHash []byte

 	workingChain *BlockChain
 }

-func NewChainManager(ethereum EthManager) *ChainManager {
+func NewChainManager() *ChainManager {
 	bc := &ChainManager{}
-	bc.genesisBlock = NewBlockFromBytes(ethutil.Encode(Genesis))
-	bc.Ethereum = ethereum
+	bc.genesisBlock = types.NewBlockFromBytes(ethutil.Encode(Genesis))
+	//bc.eth = ethereum

 	bc.setLastBlock()

 	return bc
 }

-func (bc *ChainManager) Genesis() *Block {
-	return bc.genesisBlock
+func (self *ChainManager) SetProcessor(proc types.BlockProcessor) {
+	self.processor = proc
 }

-func (bc *ChainManager) NewBlock(coinbase []byte) *Block {
+func (bc *ChainManager) setLastBlock() {
+	data, _ := ethutil.Config.Db.Get([]byte("LastBlock"))
+	if len(data) != 0 {
+		// Prep genesis
+		AddTestNetFunds(bc.genesisBlock)
+
+		block := types.NewBlockFromBytes(data)
+		bc.CurrentBlock = block
+		bc.LastBlockHash = block.Hash()
+		bc.LastBlockNumber = block.Number.Uint64()
+
+		// Set the last know difficulty (might be 0x0 as initial value, Genesis)
+		bc.TD = ethutil.BigD(ethutil.Config.Db.LastKnownTD())
+	} else {
+		bc.Reset()
+	}
+
+	chainlogger.Infof("Last block (#%d) %x\n", bc.LastBlockNumber, bc.CurrentBlock.Hash())
+}
+
+// Block creation & chain handling
+func (bc *ChainManager) NewBlock(coinbase []byte) *types.Block {
 	var root interface{}
 	hash := ZeroHash256

@ -51,7 +104,7 @@ func (bc *ChainManager) NewBlock(coinbase []byte) *Block {
 		hash = bc.LastBlockHash
 	}

-	block := CreateBlock(
+	block := types.CreateBlock(
 		root,
 		hash,
 		coinbase,
@ -72,23 +125,10 @@ func (bc *ChainManager) NewBlock(coinbase []byte) *Block {
 	return block
 }

-func CalcDifficulty(block, parent *Block) *big.Int {
-	diff := new(big.Int)
-
-	adjust := new(big.Int).Rsh(parent.Difficulty, 10)
-	if block.Time >= parent.Time+5 {
-		diff.Sub(parent.Difficulty, adjust)
-	} else {
-		diff.Add(parent.Difficulty, adjust)
-	}
-
-	return diff
-}
-
 func (bc *ChainManager) Reset() {
 	AddTestNetFunds(bc.genesisBlock)

-	bc.genesisBlock.state.Trie.Sync()
+	bc.genesisBlock.Trie().Sync()
 	// Prepare the genesis block
 	bc.add(bc.genesisBlock)
 	bc.CurrentBlock = bc.genesisBlock
@ -99,38 +139,31 @@ func (bc *ChainManager) Reset() {
 	bc.TD = ethutil.BigD(ethutil.Config.Db.LastKnownTD())
 }

+// Add a block to the chain and record addition information
+func (bc *ChainManager) add(block *types.Block) {
+	bc.writeBlockInfo(block)
+
+	bc.CurrentBlock = block
+	bc.LastBlockHash = block.Hash()
+
+	encodedBlock := block.RlpEncode()
+	ethutil.Config.Db.Put(block.Hash(), encodedBlock)
+	ethutil.Config.Db.Put([]byte("LastBlock"), encodedBlock)
+
+	//chainlogger.Infof("Imported block #%d (%x...)\n", block.Number, block.Hash()[0:4])
+}
+
+// Accessors
+func (bc *ChainManager) Genesis() *types.Block {
+	return bc.genesisBlock
+}
+
+// Block fetching methods
 func (bc *ChainManager) HasBlock(hash []byte) bool {
 	data, _ := ethutil.Config.Db.Get(hash)
 	return len(data) != 0
 }

-// TODO: At one point we might want to save a block by prevHash in the db to optimise this...
-func (bc *ChainManager) HasBlockWithPrevHash(hash []byte) bool {
-	block := bc.CurrentBlock
-
-	for ; block != nil; block = bc.GetBlock(block.PrevHash) {
-		if bytes.Compare(hash, block.PrevHash) == 0 {
-			return true
-		}
-	}
-	return false
-}
-
-func (bc *ChainManager) CalculateBlockTD(block *Block) *big.Int {
-	blockDiff := new(big.Int)
-
-	for _, uncle := range block.Uncles {
-		blockDiff = blockDiff.Add(blockDiff, uncle.Difficulty)
-	}
-	blockDiff = blockDiff.Add(blockDiff, block.Difficulty)
-
-	return blockDiff
-}
-
-func (bc *ChainManager) GenesisBlock() *Block {
-	return bc.genesisBlock
-}
-
 func (self *ChainManager) GetChainHashesFromHash(hash []byte, max uint64) (chain [][]byte) {
 	block := self.GetBlock(hash)
 	if block == nil {
@ -152,42 +185,37 @@ func (self *ChainManager) GetChainHashesFromHash(hash []byte, max uint64) (chain
 	return
 }

-func AddTestNetFunds(block *Block) {
-	for _, addr := range []string{
-		"51ba59315b3a95761d0863b05ccc7a7f54703d99",
-		"e4157b34ea9615cfbde6b4fda419828124b70c78",
-		"b9c015918bdaba24b4ff057a92a3873d6eb201be",
-		"6c386a4b26f73c802f34673f7248bb118f97424a",
-		"cd2a3d9f938e13cd947ec05abc7fe734df8dd826",
-		"2ef47100e0787b915105fd5e3f4ff6752079d5cb",
-		"e6716f9544a56c530d868e4bfbacb172315bdead",
-		"1a26338f0d905e295fccb71fa9ea849ffa12aaf4",
-	} {
-		codedAddr := ethutil.Hex2Bytes(addr)
-		account := block.state.GetAccount(codedAddr)
-		account.SetBalance(ethutil.Big("1606938044258990275541962092341162602522202993782792835301376")) //ethutil.BigPow(2, 200)
-		block.state.UpdateStateObject(account)
+func (self *ChainManager) GetBlock(hash []byte) *types.Block {
+	data, _ := ethutil.Config.Db.Get(hash)
+	if len(data) == 0 {
+		if self.workingChain != nil {
+			// Check the temp chain
+			for e := self.workingChain.Front(); e != nil; e = e.Next() {
+				if bytes.Compare(e.Value.(*link).Block.Hash(), hash) == 0 {
+					return e.Value.(*link).Block
+				}
+			}
+		}
+
+		return nil
 	}
+
+	return types.NewBlockFromBytes(data)
 }

-func (bc *ChainManager) setLastBlock() {
-	data, _ := ethutil.Config.Db.Get([]byte("LastBlock"))
-	if len(data) != 0 {
-		// Prep genesis
-		AddTestNetFunds(bc.genesisBlock)
-
-		block := NewBlockFromBytes(data)
-		bc.CurrentBlock = block
-		bc.LastBlockHash = block.Hash()
-		bc.LastBlockNumber = block.Number.Uint64()
-
-		// Set the last know difficulty (might be 0x0 as initial value, Genesis)
-		bc.TD = ethutil.BigD(ethutil.Config.Db.LastKnownTD())
-	} else {
-		bc.Reset()
+func (self *ChainManager) GetBlockByNumber(num uint64) *types.Block {
+	block := self.CurrentBlock
+	for ; block != nil; block = self.GetBlock(block.PrevHash) {
+		if block.Number.Uint64() == num {
+			break
+		}
 	}

-	chainlogger.Infof("Last block (#%d) %x\n", bc.LastBlockNumber, bc.CurrentBlock.Hash())
+	if block != nil && block.Number.Uint64() == 0 && num != 0 {
+		return nil
+	}
+
+	return block
 }

 func (bc *ChainManager) SetTotalDifficulty(td *big.Int) {
@ -195,21 +223,7 @@ func (bc *ChainManager) SetTotalDifficulty(td *big.Int) {
 	bc.TD = td
 }

-// Add a block to the chain and record addition information
-func (bc *ChainManager) add(block *Block) {
-	bc.writeBlockInfo(block)
-
-	bc.CurrentBlock = block
-	bc.LastBlockHash = block.Hash()
-
-	encodedBlock := block.RlpEncode()
-	ethutil.Config.Db.Put(block.Hash(), encodedBlock)
-	ethutil.Config.Db.Put([]byte("LastBlock"), encodedBlock)
-
-	//chainlogger.Infof("Imported block #%d (%x...)\n", block.Number, block.Hash()[0:4])
-}
-
-func (self *ChainManager) CalcTotalDiff(block *Block) (*big.Int, error) {
+func (self *ChainManager) CalcTotalDiff(block *types.Block) (*big.Int, error) {
 	parent := self.GetBlock(block.PrevHash)
 	if parent == nil {
 		return nil, fmt.Errorf("Unable to calculate total diff without known parent %x", block.PrevHash)
@ -229,59 +243,8 @@ func (self *ChainManager) CalcTotalDiff(block *Block) (*big.Int, error) {
 	return td, nil
 }

-func (self *ChainManager) GetBlock(hash []byte) *Block {
-	data, _ := ethutil.Config.Db.Get(hash)
-	if len(data) == 0 {
-		if self.workingChain != nil {
-			// Check the temp chain
-			for e := self.workingChain.Front(); e != nil; e = e.Next() {
-				if bytes.Compare(e.Value.(*link).block.Hash(), hash) == 0 {
-					return e.Value.(*link).block
-				}
-			}
-		}
-
-		return nil
-	}
-
-	return NewBlockFromBytes(data)
-}
-
-func (self *ChainManager) GetBlockByNumber(num uint64) *Block {
-	block := self.CurrentBlock
-	for ; block != nil; block = self.GetBlock(block.PrevHash) {
-		if block.Number.Uint64() == num {
-			break
-		}
-	}
-
-	if block != nil && block.Number.Uint64() == 0 && num != 0 {
-		return nil
-	}
-
-	return block
-}
-
-func (self *ChainManager) GetBlockBack(num uint64) *Block {
-	block := self.CurrentBlock
-
-	for ; num != 0 && block != nil; num-- {
-		block = self.GetBlock(block.PrevHash)
-	}
-
-	return block
-}
-
-func (bc *ChainManager) BlockInfoByHash(hash []byte) BlockInfo {
-	bi := BlockInfo{}
-	data, _ := ethutil.Config.Db.Get(append(hash, []byte("Info")...))
-	bi.RlpDecode(data)
-
-	return bi
-}
-
-func (bc *ChainManager) BlockInfo(block *Block) BlockInfo {
-	bi := BlockInfo{}
+func (bc *ChainManager) BlockInfo(block *types.Block) types.BlockInfo {
+	bi := types.BlockInfo{}
 	data, _ := ethutil.Config.Db.Get(append(block.Hash(), []byte("Info")...))
 	bi.RlpDecode(data)

@ -289,9 +252,9 @@ func (bc *ChainManager) BlockInfo(block *Block) BlockInfo {
 }

 // Unexported method for writing extra non-essential block info to the db
-func (bc *ChainManager) writeBlockInfo(block *Block) {
+func (bc *ChainManager) writeBlockInfo(block *types.Block) {
 	bc.LastBlockNumber++
-	bi := BlockInfo{Number: bc.LastBlockNumber, Hash: block.Hash(), Parent: block.PrevHash, TD: bc.TD}
+	bi := types.BlockInfo{Number: bc.LastBlockNumber, Hash: block.Hash(), Parent: block.PrevHash, TD: bc.TD}

 	// For now we use the block hash with the words "info" appended as key
 	ethutil.Config.Db.Put(append(block.Hash(), []byte("Info")...), bi.RlpEncode())
@ -303,40 +266,24 @@ func (bc *ChainManager) Stop() {
 	}
 }

-type link struct {
-	block    *Block
-	messages state.Messages
-	td       *big.Int
-}
-
-type BlockChain struct {
-	*list.List
-}
-
-func NewChain(blocks Blocks) *BlockChain {
-	chain := &BlockChain{list.New()}
-
-	for _, block := range blocks {
-		chain.PushBack(&link{block, nil, nil})
-	}
-
-	return chain
+func (self *ChainManager) NewIterator(startHash []byte) *ChainIterator {
+	return &ChainIterator{self, self.GetBlock(startHash)}
 }

 // This function assumes you've done your checking. No checking is done at this stage anymore
-func (self *ChainManager) InsertChain(chain *BlockChain) {
+func (self *ChainManager) InsertChain(chain *BlockChain, call func(*types.Block, state.Messages)) {
 	for e := chain.Front(); e != nil; e = e.Next() {
 		link := e.Value.(*link)

-		self.add(link.block)
-		self.SetTotalDifficulty(link.td)
-		self.Ethereum.EventMux().Post(NewBlockEvent{link.block})
-		self.Ethereum.EventMux().Post(link.messages)
+		self.add(link.Block)
+		self.SetTotalDifficulty(link.Td)
+
+		call(link.Block, link.Messages)
 	}

 	b, e := chain.Front(), chain.Back()
 	if b != nil && e != nil {
-		front, back := b.Value.(*link).block, e.Value.(*link).block
+		front, back := b.Value.(*link).Block, e.Value.(*link).Block
 		chainlogger.Infof("Imported %d blocks. #%v (%x) / %#v (%x)", chain.Len(), front.Number, front.Hash()[0:4], back.Number, back.Hash()[0:4])
 	}
 }
@ -348,20 +295,17 @@ func (self *ChainManager) TestChain(chain *BlockChain) (td *big.Int, err error)
 	for e := chain.Front(); e != nil; e = e.Next() {
 		var (
 			l      = e.Value.(*link)
-			block  = l.block
+			block  = l.Block
 			parent = self.GetBlock(block.PrevHash)
 		)

-		//fmt.Println("parent", parent)
-		//fmt.Println("current", block)
-
 		if parent == nil {
 			err = fmt.Errorf("incoming chain broken on hash %x\n", block.PrevHash[0:4])
 			return
 		}

 		var messages state.Messages
-		td, messages, err = self.Ethereum.BlockManager().ProcessWithParent(block, parent)
+		td, messages, err = self.processor.ProcessWithParent(block, parent) //self.eth.BlockManager().ProcessWithParent(block, parent)
 		if err != nil {
 			chainlogger.Infoln(err)
 			chainlogger.Debugf("Block #%v failed (%x...)\n", block.Number, block.Hash()[0:4])
@ -370,8 +314,8 @@ func (self *ChainManager) TestChain(chain *BlockChain) (td *big.Int, err error)
 			err = fmt.Errorf("incoming chain failed %v\n", err)
 			return
 		}
-		l.td = td
-		l.messages = messages
+		l.Td = td
+		l.Messages = messages
 	}

 	if td.Cmp(self.TD) <= 0 {
@ -383,3 +327,42 @@ func (self *ChainManager) TestChain(chain *BlockChain) (td *big.Int, err error)

 	return
 }
+
+type link struct {
+	Block    *types.Block
+	Messages state.Messages
+	Td       *big.Int
+}
+
+type BlockChain struct {
+	*list.List
+}
+
+func NewChain(blocks types.Blocks) *BlockChain {
+	chain := &BlockChain{list.New()}
+
+	for _, block := range blocks {
+		chain.PushBack(&link{block, nil, nil})
+	}
+
+	return chain
+}
+
+func (self *BlockChain) RlpEncode() []byte {
+	dat := make([]interface{}, 0)
+	for e := self.Front(); e != nil; e = e.Next() {
+		dat = append(dat, e.Value.(*link).Block.RlpData())
+	}
+
+	return ethutil.Encode(dat)
+}
+
+type ChainIterator struct {
+	cm    *ChainManager
+	block *types.Block // current block in the iterator
+}
+
+func (self *ChainIterator) Prev() *types.Block {
+	self.block = self.cm.GetBlock(self.block.PrevHash)
+	return self.block
+}
--- a/chain/chain_manager_test.go
+++ b/chain/chain_manager_test.go
@ -1 +1,116 @@
 package chain
+
+import (
+	"fmt"
+	"math/big"
+	"testing"
+	"time"
+
+	"github.com/ethereum/go-ethereum/chain/types"
+	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/ethereum/go-ethereum/ethutil"
+	"github.com/ethereum/go-ethereum/state"
+)
+
+var TD *big.Int
+
+func init() {
+	ethutil.ReadConfig(".ethtest", "/tmp/ethtest", "")
+	ethutil.Config.Db, _ = ethdb.NewMemDatabase()
+}
+
+type fakeproc struct {
+}
+
+func (self fakeproc) ProcessWithParent(a, b *types.Block) (*big.Int, state.Messages, error) {
+	TD = new(big.Int).Add(TD, big.NewInt(1))
+	return TD, nil, nil
+}
+
+func makechain(cman *ChainManager, max int) *BlockChain {
+	blocks := make(types.Blocks, max)
+	for i := 0; i < max; i++ {
+		addr := ethutil.LeftPadBytes([]byte{byte(i)}, 20)
+		block := cman.NewBlock(addr)
+		if i != 0 {
+			cman.CurrentBlock = blocks[i-1]
+		}
+		blocks[i] = block
+	}
+	return NewChain(blocks)
+}
+
+func TestLongerFork(t *testing.T) {
+	cman := NewChainManager()
+	cman.SetProcessor(fakeproc{})
+
+	TD = big.NewInt(1)
+	chainA := makechain(cman, 5)
+
+	TD = big.NewInt(1)
+	chainB := makechain(cman, 10)
+
+	td, err := cman.TestChain(chainA)
+	if err != nil {
+		t.Error("unable to create new TD from chainA:", err)
+	}
+	cman.TD = td
+
+	_, err = cman.TestChain(chainB)
+	if err != nil {
+		t.Error("expected chainB not to give errors:", err)
+	}
+}
+
+func TestEqualFork(t *testing.T) {
+	cman := NewChainManager()
+	cman.SetProcessor(fakeproc{})
+
+	TD = big.NewInt(1)
+	chainA := makechain(cman, 5)
+
+	TD = big.NewInt(2)
+	chainB := makechain(cman, 5)
+
+	td, err := cman.TestChain(chainA)
+	if err != nil {
+		t.Error("unable to create new TD from chainA:", err)
+	}
+	cman.TD = td
+
+	_, err = cman.TestChain(chainB)
+	if err != nil {
+		t.Error("expected chainB not to give errors:", err)
+	}
+}
+
+func TestBrokenChain(t *testing.T) {
+	cman := NewChainManager()
+	cman.SetProcessor(fakeproc{})
+
+	TD = big.NewInt(1)
+	chain := makechain(cman, 5)
+	chain.Remove(chain.Front())
+
+	_, err := cman.TestChain(chain)
+	if err == nil {
+		t.Error("expected broken chain to return error")
+	}
+}
+
+func BenchmarkChainTesting(b *testing.B) {
+	const chainlen = 1000
+
+	ethutil.ReadConfig(".ethtest", "/tmp/ethtest", "")
+	ethutil.Config.Db, _ = ethdb.NewMemDatabase()
+
+	cman := NewChainManager()
+	cman.SetProcessor(fakeproc{})
+
+	TD = big.NewInt(1)
+	chain := makechain(cman, chainlen)
+
+	stime := time.Now()
+	cman.TestChain(chain)
+	fmt.Println(chainlen, "took", time.Since(stime))
+}
--- a/chain/dagger.go
+++ b/chain/dagger.go
@ -6,6 +6,7 @@ import (
 	"math/rand"
 	"time"

+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/logger"
@ -15,7 +16,7 @@ import (
 var powlogger = logger.NewLogger("POW")

 type PoW interface {
-	Search(block *Block, stop <-chan struct{}) []byte
+	Search(block *types.Block, stop <-chan struct{}) []byte
 	Verify(hash []byte, diff *big.Int, nonce []byte) bool
 	GetHashrate() int64
 	Turbo(bool)
@ -35,7 +36,7 @@ func (pow *EasyPow) Turbo(on bool) {
 	pow.turbo = on
 }

-func (pow *EasyPow) Search(block *Block, stop <-chan struct{}) []byte {
+func (pow *EasyPow) Search(block *types.Block, stop <-chan struct{}) []byte {
 	r := rand.New(rand.NewSource(time.Now().UnixNano()))
 	hash := block.HashNoNonce()
 	diff := block.Difficulty
--- a/chain/events.go
+++ b/chain/events.go
@ -1,10 +1,12 @@
 package chain

+import "github.com/ethereum/go-ethereum/chain/types"
+
 // TxPreEvent is posted when a transaction enters the transaction pool.
-type TxPreEvent struct{ Tx *Transaction }
+type TxPreEvent struct{ Tx *types.Transaction }

 // TxPostEvent is posted when a transaction has been processed.
-type TxPostEvent struct{ Tx *Transaction }
+type TxPostEvent struct{ Tx *types.Transaction }

 // NewBlockEvent is posted when a block has been imported.
-type NewBlockEvent struct{ Block *Block }
+type NewBlockEvent struct{ Block *types.Block }
--- a/chain/filter.go
+++ b/chain/filter.go
@ -5,6 +5,7 @@ import (
 	"math"
 	"math/big"

+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/state"
 )
@ -24,7 +25,7 @@ type Filter struct {

 	Altered []AccountChange

-	BlockCallback   func(*Block)
+	BlockCallback   func(*types.Block)
 	MessageCallback func(state.Messages)
 }

@ -171,11 +172,11 @@ func (self *Filter) FilterMessages(msgs []*state.Message) []*state.Message {
 	return messages
 }

-func (self *Filter) bloomFilter(block *Block) bool {
+func (self *Filter) bloomFilter(block *types.Block) bool {
 	var fromIncluded, toIncluded bool
 	if len(self.from) > 0 {
 		for _, from := range self.from {
-			if BloomLookup(block.LogsBloom, from) {
+			if types.BloomLookup(block.LogsBloom, from) {
 				fromIncluded = true
 				break
 			}
@ -186,7 +187,7 @@ func (self *Filter) bloomFilter(block *Block) bool {

 	if len(self.to) > 0 {
 		for _, to := range self.to {
-			if BloomLookup(block.LogsBloom, ethutil.U256(new(big.Int).Add(ethutil.Big1, ethutil.BigD(to))).Bytes()) {
+			if types.BloomLookup(block.LogsBloom, ethutil.U256(new(big.Int).Add(ethutil.Big1, ethutil.BigD(to))).Bytes()) {
 				toIncluded = true
 				break
 			}
--- a/chain/helper_test.go
+++ b/chain/helper_test.go
@ -4,6 +4,7 @@ import (
 	"container/list"
 	"fmt"

+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/ethutil"
@ -19,7 +20,7 @@ type TestManager struct {
 	db         ethutil.Database
 	txPool     *TxPool
 	blockChain *ChainManager
-	Blocks     []*Block
+	Blocks     []*types.Block
 }

 func (s *TestManager) IsListening() bool {
--- a/chain/state_transition.go
+++ b/chain/state_transition.go
@ -4,6 +4,7 @@ import (
 	"fmt"
 	"math/big"

+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/state"
 	"github.com/ethereum/go-ethereum/vm"
 )
@ -26,17 +27,17 @@ import (
 */
 type StateTransition struct {
 	coinbase, receiver []byte
-	tx                 *Transaction
+	tx                 *types.Transaction
 	gas, gasPrice      *big.Int
 	value              *big.Int
 	data               []byte
 	state              *state.State
-	block              *Block
+	block              *types.Block

 	cb, rec, sen *state.StateObject
 }

-func NewStateTransition(coinbase *state.StateObject, tx *Transaction, state *state.State, block *Block) *StateTransition {
+func NewStateTransition(coinbase *state.StateObject, tx *types.Transaction, state *state.State, block *types.Block) *StateTransition {
 	return &StateTransition{coinbase.Address(), tx.Recipient, tx, new(big.Int), new(big.Int).Set(tx.GasPrice), tx.Value, tx.Data, state, block, coinbase, nil, nil}
 }

@ -203,7 +204,7 @@ func (self *StateTransition) TransitionState() (err error) {
 	})

 	// Process the init code and create 'valid' contract
-	if IsContractAddr(self.receiver) {
+	if types.IsContractAddr(self.receiver) {
 		// Evaluate the initialization script
 		// and use the return value as the
 		// script section for the state object.
@ -280,7 +281,7 @@ func (self *StateTransition) Eval(msg *state.Message, script []byte, context *st
 }

 // Converts an transaction in to a state object
-func MakeContract(tx *Transaction, state *state.State) *state.StateObject {
+func MakeContract(tx *types.Transaction, state *state.State) *state.StateObject {
 	addr := tx.CreationAddress(state)

 	contract := state.GetOrNewStateObject(addr)
--- a/chain/transaction_pool.go
+++ b/chain/transaction_pool.go
@ -7,6 +7,7 @@ import (
 	"math/big"
 	"sync"

+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/state"
 	"github.com/ethereum/go-ethereum/wire"
@ -16,7 +17,7 @@ var txplogger = logger.NewLogger("TXP")

 const txPoolQueueSize = 50

-type TxPoolHook chan *Transaction
+type TxPoolHook chan *types.Transaction
 type TxMsgTy byte

 const (
@ -26,21 +27,21 @@ const (
 var MinGasPrice = big.NewInt(10000000000000)

 type TxMsg struct {
-	Tx   *Transaction
+	Tx   *types.Transaction
 	Type TxMsgTy
 }

-func EachTx(pool *list.List, it func(*Transaction, *list.Element) bool) {
+func EachTx(pool *list.List, it func(*types.Transaction, *list.Element) bool) {
 	for e := pool.Front(); e != nil; e = e.Next() {
-		if it(e.Value.(*Transaction), e) {
+		if it(e.Value.(*types.Transaction), e) {
 			break
 		}
 	}
 }

-func FindTx(pool *list.List, finder func(*Transaction, *list.Element) bool) *Transaction {
+func FindTx(pool *list.List, finder func(*types.Transaction, *list.Element) bool) *types.Transaction {
 	for e := pool.Front(); e != nil; e = e.Next() {
-		if tx, ok := e.Value.(*Transaction); ok {
+		if tx, ok := e.Value.(*types.Transaction); ok {
 			if finder(tx, e) {
 				return tx
 			}
@ -51,7 +52,7 @@ func FindTx(pool *list.List, finder func(*Transaction, *list.Element) bool) *Tra
 }

 type TxProcessor interface {
-	ProcessTransaction(tx *Transaction)
+	ProcessTransaction(tx *types.Transaction)
 }

 // The tx pool a thread safe transaction pool handler. In order to
@ -65,7 +66,7 @@ type TxPool struct {
 	mutex sync.Mutex
 	// Queueing channel for reading and writing incoming
 	// transactions to
-	queueChan chan *Transaction
+	queueChan chan *types.Transaction
 	// Quiting channel
 	quit chan bool
 	// The actual pool
@ -79,14 +80,14 @@ type TxPool struct {
 func NewTxPool(ethereum EthManager) *TxPool {
 	return &TxPool{
 		pool:      list.New(),
-		queueChan: make(chan *Transaction, txPoolQueueSize),
+		queueChan: make(chan *types.Transaction, txPoolQueueSize),
 		quit:      make(chan bool),
 		Ethereum:  ethereum,
 	}
 }

 // Blocking function. Don't use directly. Use QueueTransaction instead
-func (pool *TxPool) addTransaction(tx *Transaction) {
+func (pool *TxPool) addTransaction(tx *types.Transaction) {
 	pool.mutex.Lock()
 	defer pool.mutex.Unlock()

@ -96,7 +97,7 @@ func (pool *TxPool) addTransaction(tx *Transaction) {
 	pool.Ethereum.Broadcast(wire.MsgTxTy, []interface{}{tx.RlpData()})
 }

-func (pool *TxPool) ValidateTransaction(tx *Transaction) error {
+func (pool *TxPool) ValidateTransaction(tx *types.Transaction) error {
 	// Get the last block so we can retrieve the sender and receiver from
 	// the merkle trie
 	block := pool.Ethereum.ChainManager().CurrentBlock
@ -142,7 +143,7 @@ out:
 		select {
 		case tx := <-pool.queueChan:
 			hash := tx.Hash()
-			foundTx := FindTx(pool.pool, func(tx *Transaction, e *list.Element) bool {
+			foundTx := FindTx(pool.pool, func(tx *types.Transaction, e *list.Element) bool {
 				return bytes.Compare(tx.Hash(), hash) == 0
 			})

@ -172,18 +173,18 @@ out:
 	}
 }

-func (pool *TxPool) QueueTransaction(tx *Transaction) {
+func (pool *TxPool) QueueTransaction(tx *types.Transaction) {
 	pool.queueChan <- tx
 }

-func (pool *TxPool) CurrentTransactions() []*Transaction {
+func (pool *TxPool) CurrentTransactions() []*types.Transaction {
 	pool.mutex.Lock()
 	defer pool.mutex.Unlock()

-	txList := make([]*Transaction, pool.pool.Len())
+	txList := make([]*types.Transaction, pool.pool.Len())
 	i := 0
 	for e := pool.pool.Front(); e != nil; e = e.Next() {
-		tx := e.Value.(*Transaction)
+		tx := e.Value.(*types.Transaction)

 		txList[i] = tx

@ -198,7 +199,7 @@ func (pool *TxPool) RemoveInvalid(state *state.State) {
 	defer pool.mutex.Unlock()

 	for e := pool.pool.Front(); e != nil; e = e.Next() {
-		tx := e.Value.(*Transaction)
+		tx := e.Value.(*types.Transaction)
 		sender := state.GetAccount(tx.Sender())
 		err := pool.ValidateTransaction(tx)
 		if err != nil || sender.Nonce >= tx.Nonce {
@ -207,12 +208,12 @@ func (pool *TxPool) RemoveInvalid(state *state.State) {
 	}
 }

-func (self *TxPool) RemoveSet(txs Transactions) {
+func (self *TxPool) RemoveSet(txs types.Transactions) {
 	self.mutex.Lock()
 	defer self.mutex.Unlock()

 	for _, tx := range txs {
-		EachTx(self.pool, func(t *Transaction, element *list.Element) bool {
+		EachTx(self.pool, func(t *types.Transaction, element *list.Element) bool {
 			if t == tx {
 				self.pool.Remove(element)
 				return true // To stop the loop
@ -222,7 +223,7 @@ func (self *TxPool) RemoveSet(txs Transactions) {
 	}
 }

-func (pool *TxPool) Flush() []*Transaction {
+func (pool *TxPool) Flush() []*types.Transaction {
 	txList := pool.CurrentTransactions()

 	// Recreate a new list all together
--- a/chain/transaction_test.go
+++ b/chain/transaction_test.go
@ -1 +0,0 @@
-package chain
--- a/chain/types/block.go
+++ b/chain/types/block.go
@ -1,4 +1,4 @@
-package chain
+package types

 import (
 	"bytes"
@ -156,7 +156,7 @@ func (block *Block) State() *state.State {
 	return block.state
 }

-func (block *Block) Transactions() []*Transaction {
+func (block *Block) Transactions() Transactions {
 	return block.transactions
 }

--- a/chain/types/bloom9.go
+++ b/chain/types/bloom9.go
@ -1,4 +1,4 @@
-package chain
+package types

 import (
 	"math/big"
--- a/chain/types/bloom9_test.go
+++ b/chain/types/bloom9_test.go
@ -1,4 +1,4 @@
-package chain
+package types

 /*
 import (
--- a/chain/types/common.go
+++ b/chain/types/common.go
@ -0,0 +1,10 @@
+package types
+
+import (
+	"math/big"
+	"github.com/ethereum/go-ethereum/state"
+)
+
+type BlockProcessor interface {
+	ProcessWithParent(*Block, *Block) (*big.Int, state.Messages, error)
+}
--- a/chain/types/derive_sha.go
+++ b/chain/types/derive_sha.go
@ -1,4 +1,4 @@
-package chain
+package types

 import (
 	"github.com/ethereum/go-ethereum/ethutil"
--- a/chain/types/receipt.go
+++ b/chain/types/receipt.go
@ -1,4 +1,4 @@
-package chain
+package types

 import (
 	"bytes"
@ -16,6 +16,10 @@ type Receipt struct {
 	logs              state.Logs
 }

+func NewReceipt(root []byte, cumalativeGasUsed *big.Int) *Receipt {
+	return &Receipt{PostState: ethutil.CopyBytes(root), CumulativeGasUsed: cumalativeGasUsed}
+}
+
 func NewRecieptFromValue(val *ethutil.Value) *Receipt {
 	r := &Receipt{}
 	r.RlpValueDecode(val)
@ -23,6 +27,10 @@ func NewRecieptFromValue(val *ethutil.Value) *Receipt {
 	return r
 }

+func (self *Receipt) SetLogs(logs state.Logs) {
+	self.logs = logs
+}
+
 func (self *Receipt) RlpValueDecode(decoder *ethutil.Value) {
 	self.PostState = decoder.Get(0).Bytes()
 	self.CumulativeGasUsed = decoder.Get(1).BigInt()
--- a/chain/types/transaction.go
+++ b/chain/types/transaction.go
@ -1,4 +1,4 @@
-package chain
+package types

 import (
 	"fmt"
--- a/chain/types/transaction_test.go
+++ b/chain/types/transaction_test.go
@ -0,0 +1 @@
+package types
--- a/chain/vm_env.go
+++ b/chain/vm_env.go
@ -3,17 +3,18 @@ package chain
 import (
 	"math/big"

+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/state"
 	"github.com/ethereum/go-ethereum/vm"
 )

 type VMEnv struct {
 	state *state.State
-	block *Block
-	tx    *Transaction
+	block *types.Block
+	tx    *types.Transaction
 }

-func NewEnv(state *state.State, tx *Transaction, block *Block) *VMEnv {
+func NewEnv(state *state.State, tx *types.Transaction, block *types.Block) *VMEnv {
 	return &VMEnv{
 		state: state,
 		block: block,
--- a/cmd/ethereum/main.go
+++ b/cmd/ethereum/main.go
@ -21,8 +21,7 @@ import (
 	"fmt"
 	"os"
 	"runtime"
-
-	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/logger"
@ -74,7 +73,7 @@ func main() {
 	ethereum := utils.NewEthereum(db, clientIdentity, keyManager, UseUPnP, OutboundPort, MaxPeer)

 	if Dump {
-		var block *chain.Block
+		var block *types.Block

 		if len(DumpHash) == 0 && DumpNumber == -1 {
 			block = ethereum.ChainManager().CurrentBlock
--- a/cmd/ethtest/main.go
+++ b/cmd/ethtest/main.go
@ -15,7 +15,7 @@
 	along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
 */
 /**
- * @authors
+ * @authors:
 * 	Jeffrey Wilcke <i@jev.io>
 * @date 2014
 *
--- a/cmd/mist/bindings.go
+++ b/cmd/mist/bindings.go
@ -21,8 +21,7 @@ import (
 	"encoding/json"
 	"os"
 	"strconv"
-
-	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/logger"
@ -106,7 +105,7 @@ func (self *Gui) DumpState(hash, path string) {
 	if len(hash) == 0 {
 		stateDump = self.eth.BlockManager().CurrentState().Dump()
 	} else {
-		var block *chain.Block
+		var block *types.Block
 		if hash[0] == '#' {
 			i, _ := strconv.Atoi(hash[1:])
 			block = self.eth.ChainManager().GetBlockByNumber(uint64(i))
--- a/cmd/mist/ext_app.go
+++ b/cmd/mist/ext_app.go
@ -21,6 +21,7 @@ import (
 	"encoding/json"

 	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/javascript"
 	"github.com/ethereum/go-ethereum/state"
@ -36,7 +37,7 @@ type AppContainer interface {
 	Window() *qml.Window
 	Engine() *qml.Engine

-	NewBlock(*chain.Block)
+	NewBlock(*types.Block)
 	NewWatcher(chan bool)
 	Messages(state.Messages, string)
 	Post(string, int)
--- a/cmd/mist/gui.go
+++ b/cmd/mist/gui.go
@ -32,6 +32,7 @@ import (

 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/logger"
@ -63,6 +64,15 @@ func LoadExtension(path string) (uintptr, error) {
 	return ptr.Interface().(uintptr), nil
 }
 */
+/*
+	vec, errr := LoadExtension("/Users/jeffrey/Desktop/build-libqmltest-Desktop_Qt_5_2_1_clang_64bit-Debug/liblibqmltest_debug.dylib")
+	fmt.Printf("Fetched vec with addr: %#x\n", vec)
+	if errr != nil {
+		fmt.Println(errr)
+	} else {
+		context.SetVar("vec", (unsafe.Pointer)(vec))
+	}
+*/

 var guilogger = logger.NewLogger("GUI")

@ -112,9 +122,10 @@ func NewWindow(ethereum *eth.Ethereum, config *ethutil.ConfigManager, clientIden
 }

 func (gui *Gui) Start(assetPath string) {
-
 	defer gui.txDb.Close()

+	guilogger.Infoln("Starting GUI")
+
 	// Register ethereum functions
 	qml.RegisterTypes("Ethereum", 1, 0, []qml.TypeSpec{{
 		Init: func(p *xeth.JSBlock, obj qml.Object) { p.Number = 0; p.Hash = "" },
@ -132,16 +143,6 @@ func (gui *Gui) Start(assetPath string) {
 	context.SetVar("gui", gui)
 	context.SetVar("eth", gui.uiLib)

-	/*
-		vec, errr := LoadExtension("/Users/jeffrey/Desktop/build-libqmltest-Desktop_Qt_5_2_1_clang_64bit-Debug/liblibqmltest_debug.dylib")
-		fmt.Printf("Fetched vec with addr: %#x\n", vec)
-		if errr != nil {
-			fmt.Println(errr)
-		} else {
-			context.SetVar("vec", (unsafe.Pointer)(vec))
-		}
-	*/
-
 	// Load the main QML interface
 	data, _ := ethutil.Config.Db.Get([]byte("KeyRing"))

@ -160,7 +161,6 @@ func (gui *Gui) Start(assetPath string) {
 		panic(err)
 	}

-	guilogger.Infoln("Starting GUI")
 	gui.open = true
 	win.Show()

@ -245,7 +245,7 @@ func (gui *Gui) CreateAndSetPrivKey() (string, string, string, string) {
 	return gui.eth.KeyManager().KeyPair().AsStrings()
 }

-func (gui *Gui) setInitialChainManager() {
+func (gui *Gui) setInitialChain(ancientBlocks bool) {
 	sBlk := gui.eth.ChainManager().LastBlockHash
 	blk := gui.eth.ChainManager().GetBlock(sBlk)
 	for ; blk != nil; blk = gui.eth.ChainManager().GetBlock(sBlk) {
@ -255,10 +255,6 @@ func (gui *Gui) setInitialChainManager() {
 	}
 }

-type address struct {
-	Name, Address string
-}
-
 func (gui *Gui) loadAddressBook() {
 	view := gui.getObjectByName("infoView")
 	nameReg := gui.pipe.World().Config().Get("NameReg")
@ -295,7 +291,7 @@ func (self *Gui) loadMergedMiningOptions() {
 	}
 }

-func (gui *Gui) insertTransaction(window string, tx *chain.Transaction) {
+func (gui *Gui) insertTransaction(window string, tx *types.Transaction) {
 	pipe := xeth.New(gui.eth)
 	nameReg := pipe.World().Config().Get("NameReg")
 	addr := gui.address()
@ -345,7 +341,7 @@ func (gui *Gui) insertTransaction(window string, tx *chain.Transaction) {
 func (gui *Gui) readPreviousTransactions() {
 	it := gui.txDb.NewIterator()
 	for it.Next() {
-		tx := chain.NewTransactionFromBytes(it.Value())
+		tx := types.NewTransactionFromBytes(it.Value())

 		gui.insertTransaction("post", tx)

@ -353,7 +349,7 @@ func (gui *Gui) readPreviousTransactions() {
 	it.Release()
 }

-func (gui *Gui) processBlock(block *chain.Block, initial bool) {
+func (gui *Gui) processBlock(block *types.Block, initial bool) {
 	name := strings.Trim(gui.pipe.World().Config().Get("NameReg").Storage(block.Coinbase).Str(), "\x00")
 	b := xeth.NewJSBlock(block)
 	b.Name = name
@ -385,11 +381,11 @@ func (self *Gui) getObjectByName(objectName string) qml.Object {
 func (gui *Gui) update() {
 	// We have to wait for qml to be done loading all the windows.
 	for !gui.qmlDone {
-		time.Sleep(500 * time.Millisecond)
+		time.Sleep(300 * time.Millisecond)
 	}

 	go func() {
-		go gui.setInitialChainManager()
+		go gui.setInitialChain(false)
 		gui.loadAddressBook()
 		gui.loadMergedMiningOptions()
 		gui.setPeerInfo()
@ -493,14 +489,7 @@ func (gui *Gui) update() {
 			case <-generalUpdateTicker.C:
 				statusText := "#" + gui.eth.ChainManager().CurrentBlock.Number.String()
 				lastBlockLabel.Set("text", statusText)
-
 				miningLabel.Set("text", "Mining @ "+strconv.FormatInt(gui.uiLib.miner.GetPow().GetHashrate(), 10)+"Khash")
-				/*
-					if gui.miner != nil {
-						pow := gui.miner.GetPow()
-						miningLabel.Set("text", "Mining @ "+strconv.FormatInt(pow.GetHashrate(), 10)+"Khash")
-					}
-				*/

 				blockLength := gui.eth.BlockPool().BlocksProcessed
 				chainLength := gui.eth.BlockPool().ChainLength
@ -510,7 +499,6 @@ func (gui *Gui) update() {
 					dlWidget         = gui.win.Root().ObjectByName("downloadIndicator")
 					dlLabel          = gui.win.Root().ObjectByName("downloadLabel")
 				)
-
 				dlWidget.Set("value", pct)
 				dlLabel.Set("text", fmt.Sprintf("%d / %d", blockLength, chainLength))

@ -549,7 +537,6 @@ NumGC:      %d

 func (gui *Gui) setPeerInfo() {
 	gui.win.Root().Call("setPeers", fmt.Sprintf("%d / %d", gui.eth.PeerCount(), gui.eth.MaxPeers))
-
 	gui.win.Root().Call("resetPeers")
 	for _, peer := range gui.pipe.Peers() {
 		gui.win.Root().Call("addPeer", peer)
--- a/cmd/mist/html_container.go
+++ b/cmd/mist/html_container.go
@ -26,8 +26,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
-
-	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/javascript"
 	"github.com/ethereum/go-ethereum/state"
@ -138,7 +137,7 @@ func (app *HtmlApplication) Window() *qml.Window {
 	return app.win
 }

-func (app *HtmlApplication) NewBlock(block *chain.Block) {
+func (app *HtmlApplication) NewBlock(block *types.Block) {
 	b := &xeth.JSBlock{Number: int(block.BlockInfo().Number), Hash: ethutil.Bytes2Hex(block.Hash())}
 	app.webView.Call("onNewBlockCb", b)
 }
--- a/cmd/mist/main.go
+++ b/cmd/mist/main.go
@ -18,8 +18,10 @@
 package main

 import (
+	"fmt"
 	"os"
 	"runtime"
+	"time"

 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/cmd/utils"
@ -38,6 +40,7 @@ func run() error {
 	// precedence: code-internal flag default < config file < environment variables < command line
 	Init() // parsing command line

+	tstart := time.Now()
 	config := utils.InitConfig(VmType, ConfigFile, Datadir, "ETH")

 	utils.InitDataDir(Datadir)
@ -51,14 +54,11 @@ func run() error {

 		os.Exit(1)
 	}
-
 	keyManager := utils.NewKeyManager(KeyStore, Datadir, db)

 	// create, import, export keys
 	utils.KeyTasks(keyManager, KeyRing, GenAddr, SecretFile, ExportDir, NonInteractive)
-
 	clientIdentity := utils.NewClientIdentity(ClientIdentifier, Version, Identifier)
-
 	ethereum = utils.NewEthereum(db, clientIdentity, keyManager, UseUPnP, OutboundPort, MaxPeer)

 	if ShowGenesis {
@ -75,7 +75,10 @@ func run() error {
 	utils.RegisterInterrupt(func(os.Signal) {
 		gui.Stop()
 	})
-	utils.StartEthereum(ethereum, UseSeed)
+	go utils.StartEthereum(ethereum, UseSeed)
+
+	fmt.Println("ETH stack took", time.Since(tstart))
+
 	// gui blocks the main thread
 	gui.Start(AssetPath)

--- a/cmd/mist/qml_container.go
+++ b/cmd/mist/qml_container.go
@ -20,8 +20,7 @@ package main
 import (
 	"fmt"
 	"runtime"
-
-	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/state"
 	"github.com/ethereum/go-ethereum/xeth"
@ -65,7 +64,7 @@ func (app *QmlApplication) NewWatcher(quitChan chan bool) {
 }

 // Events
-func (app *QmlApplication) NewBlock(block *chain.Block) {
+func (app *QmlApplication) NewBlock(block *types.Block) {
 	pblock := &xeth.JSBlock{Number: int(block.BlockInfo().Number), Hash: ethutil.Bytes2Hex(block.Hash())}
 	app.win.Call("onNewBlockCb", pblock)
 }
--- a/cmd/mist/ui_lib.go
+++ b/cmd/mist/ui_lib.go
@ -26,6 +26,7 @@ import (

 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/javascript"
@ -126,7 +127,7 @@ func (self *UiLib) PastPeers() *ethutil.List {
 }

 func (self *UiLib) ImportTx(rlpTx string) {
-	tx := chain.NewTransactionFromBytes(ethutil.Hex2Bytes(rlpTx))
+	tx := types.NewTransactionFromBytes(ethutil.Hex2Bytes(rlpTx))
 	self.eth.TxPool().QueueTransaction(tx)
 }

@ -228,7 +229,7 @@ func (self *UiLib) NewFilter(object map[string]interface{}) (id int) {

 func (self *UiLib) NewFilterString(typ string) (id int) {
 	filter := chain.NewFilter(self.eth)
-	filter.BlockCallback = func(block *chain.Block) {
+	filter.BlockCallback = func(block *types.Block) {
 		if self.win != nil && self.win.Root() != nil {
 			self.win.Root().Call("invokeFilterCallback", "{}", id)
 		} else {
--- a/cmd/utils/vm_env.go
+++ b/cmd/utils/vm_env.go
@ -2,21 +2,20 @@ package utils

 import (
 	"math/big"
-
-	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/state"
 	"github.com/ethereum/go-ethereum/vm"
 )

 type VMEnv struct {
 	state *state.State
-	block *chain.Block
+	block *types.Block

 	transactor []byte
 	value      *big.Int
 }

-func NewEnv(state *state.State, block *chain.Block, transactor []byte, value *big.Int) *VMEnv {
+func NewEnv(state *state.State, block *types.Block, transactor []byte, value *big.Int) *VMEnv {
 	return &VMEnv{
 		state:      state,
 		block:      block,
--- a/ethdb/memory_database.go
+++ b/ethdb/memory_database.go
@ -23,6 +23,10 @@ func (db *MemDatabase) Put(key []byte, value []byte) {
 	db.db[string(key)] = value
 }

+func (db *MemDatabase) Set(key []byte, value []byte) {
+	db.Put(key, value)
+}
+
 func (db *MemDatabase) Get(key []byte) ([]byte, error) {
 	return db.db[string(key)], nil
 }
--- a/ethereum.go
+++ b/ethereum.go
@ -129,8 +129,9 @@ func New(db ethutil.Database, clientIdentity wire.ClientIdentity, keyManager *cr

 	ethereum.blockPool = NewBlockPool(ethereum)
 	ethereum.txPool = chain.NewTxPool(ethereum)
-	ethereum.blockChain = chain.NewChainManager(ethereum)
+	ethereum.blockChain = chain.NewChainManager()
 	ethereum.blockManager = chain.NewBlockManager(ethereum)
+	ethereum.blockChain.SetProcessor(ethereum.blockManager)

 	// Start the tx pool
 	ethereum.txPool.Start()
--- a/event/profile.tmp
+++ b/event/profile.tmp
@ -1,40 +0,0 @@
-mode: count
-github.com/ethereum/go-ethereum/event/event.go:41.66,45.17 4 1005
-github.com/ethereum/go-ethereum/event/event.go:63.2,63.12 1 1004
-github.com/ethereum/go-ethereum/event/event.go:45.17,47.3 1 1
-github.com/ethereum/go-ethereum/event/event.go:47.3,48.22 1 1004
-github.com/ethereum/go-ethereum/event/event.go:51.3,51.27 1 1004
-github.com/ethereum/go-ethereum/event/event.go:48.22,50.4 1 5
-github.com/ethereum/go-ethereum/event/event.go:51.27,54.32 3 1006
-github.com/ethereum/go-ethereum/event/event.go:57.4,60.25 4 1005
-github.com/ethereum/go-ethereum/event/event.go:54.32,56.5 1 1
-github.com/ethereum/go-ethereum/event/event.go:68.48,71.17 3 3513
-github.com/ethereum/go-ethereum/event/event.go:75.2,77.27 3 3511
-github.com/ethereum/go-ethereum/event/event.go:80.2,80.12 1 3509
-github.com/ethereum/go-ethereum/event/event.go:71.17,74.3 2 2
-github.com/ethereum/go-ethereum/event/event.go:77.27,79.3 1 2576
-github.com/ethereum/go-ethereum/event/event.go:86.28,88.32 2 5
-github.com/ethereum/go-ethereum/event/event.go:93.2,95.20 3 5
-github.com/ethereum/go-ethereum/event/event.go:88.32,89.28 1 3
-github.com/ethereum/go-ethereum/event/event.go:89.28,91.4 1 3
-github.com/ethereum/go-ethereum/event/event.go:98.36,100.34 2 1001
-github.com/ethereum/go-ethereum/event/event.go:109.2,109.22 1 1001
-github.com/ethereum/go-ethereum/event/event.go:100.34,101.37 1 1001
-github.com/ethereum/go-ethereum/event/event.go:101.37,102.22 1 1001
-github.com/ethereum/go-ethereum/event/event.go:102.22,104.5 1 2
-github.com/ethereum/go-ethereum/event/event.go:104.5,106.5 1 999
-github.com/ethereum/go-ethereum/event/event.go:112.46,113.26 1 2007
-github.com/ethereum/go-ethereum/event/event.go:118.2,118.11 1 1005
-github.com/ethereum/go-ethereum/event/event.go:113.26,114.16 1 181499
-github.com/ethereum/go-ethereum/event/event.go:114.16,116.4 1 1002
-github.com/ethereum/go-ethereum/event/event.go:121.52,126.2 4 999
-github.com/ethereum/go-ethereum/event/event.go:142.35,150.2 2 1005
-github.com/ethereum/go-ethereum/event/event.go:152.44,154.2 1 1003
-github.com/ethereum/go-ethereum/event/event.go:156.32,159.2 2 1001
-github.com/ethereum/go-ethereum/event/event.go:161.30,164.14 3 1004
-github.com/ethereum/go-ethereum/event/event.go:167.2,173.19 6 1003
-github.com/ethereum/go-ethereum/event/event.go:164.14,166.3 1 1
-github.com/ethereum/go-ethereum/event/event.go:176.42,178.9 2 2575
-github.com/ethereum/go-ethereum/event/event.go:182.2,182.20 1 2575
-github.com/ethereum/go-ethereum/event/event.go:179.2,179.21 0 1004
-github.com/ethereum/go-ethereum/event/event.go:180.2,180.19 0 1571
--- a/javascript/javascript_runtime.go
+++ b/javascript/javascript_runtime.go
@ -9,6 +9,7 @@ import (

 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/event"
@ -130,7 +131,7 @@ func (self *JSRE) dump(call otto.FunctionCall) otto.Value {
 	var state *state.State

 	if len(call.ArgumentList) > 0 {
-		var block *chain.Block
+		var block *types.Block
 		if call.Argument(0).IsNumber() {
 			num, _ := call.Argument(0).ToInteger()
 			block = self.ethereum.ChainManager().GetBlockByNumber(uint64(num))
--- a/miner/miner.go
+++ b/miner/miner.go
@ -29,8 +29,10 @@ import (

 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/ethutil"
+	"github.com/ethereum/go-ethereum/state"

 	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/wire"
@ -44,7 +46,7 @@ type LocalTx struct {
 	Value    string `json:"value"`
 }

-func (self *LocalTx) Sign(key []byte) *chain.Transaction {
+func (self *LocalTx) Sign(key []byte) *types.Transaction {
 	return nil
 }

@ -54,7 +56,7 @@ type Miner struct {
 	eth    *eth.Ethereum
 	events event.Subscription

-	uncles    chain.Blocks
+	uncles    types.Blocks
 	localTxs  map[int]*LocalTx
 	localTxId int

@ -212,13 +214,15 @@ func (self *Miner) mine() {
 	nonce := self.pow.Search(block, self.powQuitCh)
 	if nonce != nil {
 		block.Nonce = nonce
-		lchain := chain.NewChain(chain.Blocks{block})
+		lchain := chain.NewChain(types.Blocks{block})
 		_, err := chainMan.TestChain(lchain)
 		if err != nil {
 			minerlogger.Infoln(err)
 		} else {
-			chainMan.InsertChain(lchain)
-			//self.eth.EventMux().Post(chain.NewBlockEvent{block})
+			chainMan.InsertChain(lchain, func(block *types.Block, _ state.Messages) {
+				self.eth.EventMux().Post(chain.NewBlockEvent{block})
+			})
+
 			self.eth.Broadcast(wire.MsgBlockTy, []interface{}{block.Value().Val})

 			minerlogger.Infof("🔨  Mined block %x\n", block.Hash())
@ -229,15 +233,15 @@ func (self *Miner) mine() {
 	}
 }

-func (self *Miner) finiliseTxs() chain.Transactions {
+func (self *Miner) finiliseTxs() types.Transactions {
 	// Sort the transactions by nonce in case of odd network propagation
-	var txs chain.Transactions
+	var txs types.Transactions

 	state := self.eth.BlockManager().TransState()
 	// XXX This has to change. Coinbase is, for new, same as key.
 	key := self.eth.KeyManager()
 	for _, ltx := range self.localTxs {
-		tx := chain.NewTransactionMessage(ltx.To, ethutil.Big(ltx.Value), ethutil.Big(ltx.Gas), ethutil.Big(ltx.GasPrice), ltx.Data)
+		tx := types.NewTransactionMessage(ltx.To, ethutil.Big(ltx.Value), ethutil.Big(ltx.Gas), ethutil.Big(ltx.GasPrice), ltx.Data)
 		tx.Nonce = state.GetNonce(self.Coinbase)
 		state.SetNonce(self.Coinbase, tx.Nonce+1)

@ -247,7 +251,7 @@ func (self *Miner) finiliseTxs() chain.Transactions {
 	}

 	txs = append(txs, self.eth.TxPool().CurrentTransactions()...)
-	sort.Sort(chain.TxByNonce{txs})
+	sort.Sort(types.TxByNonce{txs})

 	return txs
 }
--- a/peer.go
+++ b/peer.go
@ -12,7 +12,7 @@ import (
 	"sync/atomic"
 	"time"

-	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/wire"
@ -24,7 +24,7 @@ const (
 	// The size of the output buffer for writing messages
 	outputBufferSize = 50
 	// Current protocol version
-	ProtocolVersion = 42
+	ProtocolVersion = 43
 	// Current P2P version
 	P2PVersion = 2
 	// Ethereum network version
@ -155,7 +155,7 @@ type Peer struct {
 	pingTime      time.Duration
 	pingStartTime time.Time

-	lastRequestedBlock *chain.Block
+	lastRequestedBlock *types.Block

 	protocolCaps *ethutil.Value
 }
@ -429,7 +429,7 @@ func (p *Peer) HandleInbound() {
 				// in the TxPool where it will undergo validation and
 				// processing when a new block is found
 				for i := 0; i < msg.Data.Len(); i++ {
-					tx := chain.NewTransactionFromValue(msg.Data.Get(i))
+					tx := types.NewTransactionFromValue(msg.Data.Get(i))
 					p.ethereum.TxPool().QueueTransaction(tx)
 				}
 			case wire.MsgGetPeersTy:
@ -535,7 +535,7 @@ func (p *Peer) HandleInbound() {

 					it := msg.Data.NewIterator()
 					for it.Next() {
-						block := chain.NewBlockFromRlpValue(it.Value())
+						block := types.NewBlockFromRlpValue(it.Value())
 						blockPool.Add(block, p)

 						p.lastBlockReceived = time.Now()
@ -543,7 +543,7 @@ func (p *Peer) HandleInbound() {
 				case wire.MsgNewBlockTy:
 					var (
 						blockPool = p.ethereum.blockPool
-						block     = chain.NewBlockFromRlpValue(msg.Data.Get(0))
+						block     = types.NewBlockFromRlpValue(msg.Data.Get(0))
 						td        = msg.Data.Get(1).BigInt()
 					)

--- a/profile.cov
+++ b/profile.cov
--- a/ptrie/cache.go
+++ b/ptrie/cache.go
@ -0,0 +1,42 @@
+package ptrie
+
+type Backend interface {
+	Get([]byte) ([]byte, error)
+	Put([]byte, []byte)
+}
+
+type Cache struct {
+	store   map[string][]byte
+	backend Backend
+}
+
+func NewCache(backend Backend) *Cache {
+	return &Cache{make(map[string][]byte), backend}
+}
+
+func (self *Cache) Get(key []byte) []byte {
+	data := self.store[string(key)]
+	if data == nil {
+		data, _ = self.backend.Get(key)
+	}
+
+	return data
+}
+
+func (self *Cache) Put(key []byte, data []byte) {
+	self.store[string(key)] = data
+}
+
+func (self *Cache) Flush() {
+	for k, v := range self.store {
+		self.backend.Put([]byte(k), v)
+	}
+
+	// This will eventually grow too large. We'd could
+	// do a make limit on storage and push out not-so-popular nodes.
+	//self.Reset()
+}
+
+func (self *Cache) Reset() {
+	self.store = make(map[string][]byte)
+}
--- a/ptrie/fullnode.go
+++ b/ptrie/fullnode.go
@ -0,0 +1,69 @@
+package ptrie
+
+type FullNode struct {
+	trie  *Trie
+	nodes [17]Node
+}
+
+func NewFullNode(t *Trie) *FullNode {
+	return &FullNode{trie: t}
+}
+
+func (self *FullNode) Dirty() bool { return true }
+func (self *FullNode) Value() Node {
+	self.nodes[16] = self.trie.trans(self.nodes[16])
+	return self.nodes[16]
+}
+func (self *FullNode) Branches() []Node {
+	return self.nodes[:16]
+}
+
+func (self *FullNode) Copy() Node {
+	nnode := NewFullNode(self.trie)
+	for i, node := range self.nodes {
+		nnode.nodes[i] = node
+	}
+
+	return nnode
+}
+
+// Returns the length of non-nil nodes
+func (self *FullNode) Len() (amount int) {
+	for _, node := range self.nodes {
+		if node != nil {
+			amount++
+		}
+	}
+
+	return
+}
+
+func (self *FullNode) Hash() interface{} {
+	return self.trie.store(self)
+}
+
+func (self *FullNode) RlpData() interface{} {
+	t := make([]interface{}, 17)
+	for i, node := range self.nodes {
+		if node != nil {
+			t[i] = node.Hash()
+		} else {
+			t[i] = ""
+		}
+	}
+
+	return t
+}
+
+func (self *FullNode) set(k byte, value Node) {
+	self.nodes[int(k)] = value
+}
+
+func (self *FullNode) branch(i byte) Node {
+	if self.nodes[int(i)] != nil {
+		self.nodes[int(i)] = self.trie.trans(self.nodes[int(i)])
+
+		return self.nodes[int(i)]
+	}
+	return nil
+}
--- a/ptrie/hashnode.go
+++ b/ptrie/hashnode.go
@ -0,0 +1,22 @@
+package ptrie
+
+type HashNode struct {
+	key []byte
+}
+
+func NewHash(key []byte) *HashNode {
+	return &HashNode{key}
+}
+
+func (self *HashNode) RlpData() interface{} {
+	return self.key
+}
+
+func (self *HashNode) Hash() interface{} {
+	return self.key
+}
+
+// These methods will never be called but we have to satisfy Node interface
+func (self *HashNode) Value() Node { return nil }
+func (self *HashNode) Dirty() bool { return true }
+func (self *HashNode) Copy() Node  { return self }
--- a/ptrie/iterator.go
+++ b/ptrie/iterator.go
@ -0,0 +1,115 @@
+package ptrie
+
+import (
+	"bytes"
+
+	"github.com/ethereum/go-ethereum/trie"
+)
+
+type Iterator struct {
+	trie *Trie
+
+	Key   []byte
+	Value []byte
+}
+
+func NewIterator(trie *Trie) *Iterator {
+	return &Iterator{trie: trie, Key: []byte{0}}
+}
+
+func (self *Iterator) Next() bool {
+	self.trie.mu.Lock()
+	defer self.trie.mu.Unlock()
+
+	key := trie.RemTerm(trie.CompactHexDecode(string(self.Key)))
+	k := self.next(self.trie.root, key)
+
+	self.Key = []byte(trie.DecodeCompact(k))
+
+	return len(k) > 0
+
+}
+
+func (self *Iterator) next(node Node, key []byte) []byte {
+	if node == nil {
+		return nil
+	}
+
+	switch node := node.(type) {
+	case *FullNode:
+		if len(key) > 0 {
+			k := self.next(node.branch(key[0]), key[1:])
+			if k != nil {
+				return append([]byte{key[0]}, k...)
+			}
+		}
+
+		var r byte
+		if len(key) > 0 {
+			r = key[0] + 1
+		}
+
+		for i := r; i < 16; i++ {
+			k := self.key(node.branch(byte(i)))
+			if k != nil {
+				return append([]byte{i}, k...)
+			}
+		}
+
+	case *ShortNode:
+		k := trie.RemTerm(node.Key())
+		if vnode, ok := node.Value().(*ValueNode); ok {
+			if bytes.Compare([]byte(k), key) > 0 {
+				self.Value = vnode.Val()
+				return k
+			}
+		} else {
+			cnode := node.Value()
+
+			var ret []byte
+			skey := key[len(k):]
+			if trie.BeginsWith(key, k) {
+				ret = self.next(cnode, skey)
+			} else if bytes.Compare(k, key[:len(k)]) > 0 {
+				ret = self.key(node)
+			}
+
+			if ret != nil {
+				return append(k, ret...)
+			}
+		}
+	}
+
+	return nil
+}
+
+func (self *Iterator) key(node Node) []byte {
+	switch node := node.(type) {
+	case *ShortNode:
+		// Leaf node
+		if vnode, ok := node.Value().(*ValueNode); ok {
+			k := trie.RemTerm(node.Key())
+			self.Value = vnode.Val()
+
+			return k
+		} else {
+			k := trie.RemTerm(node.Key())
+			return append(k, self.key(node.Value())...)
+		}
+	case *FullNode:
+		if node.Value() != nil {
+			self.Value = node.Value().(*ValueNode).Val()
+
+			return []byte{16}
+		}
+
+		for i := 0; i < 16; i++ {
+			k := self.key(node.branch(byte(i)))
+			if k != nil {
+				return append([]byte{byte(i)}, k...)
+			}
+		}
+	}
+
+	return nil
+}
--- a/ptrie/iterator_test.go
+++ b/ptrie/iterator_test.go
@ -0,0 +1,33 @@
+package ptrie
+
+import "testing"
+
+func TestIterator(t *testing.T) {
+	trie := NewEmpty()
+	vals := []struct{ k, v string }{
+		{"do", "verb"},
+		{"ether", "wookiedoo"},
+		{"horse", "stallion"},
+		{"shaman", "horse"},
+		{"doge", "coin"},
+		{"dog", "puppy"},
+		{"somethingveryoddindeedthis is", "myothernodedata"},
+	}
+	v := make(map[string]bool)
+	for _, val := range vals {
+		v[val.k] = false
+		trie.UpdateString(val.k, val.v)
+	}
+	trie.Commit()
+
+	it := trie.Iterator()
+	for it.Next() {
+		v[string(it.Key)] = true
+	}
+
+	for k, found := range v {
+		if !found {
+			t.Error("iterator didn't find", k)
+		}
+	}
+}
--- a/ptrie/node.go
+++ b/ptrie/node.go
@ -0,0 +1,40 @@
+package ptrie
+
+import "fmt"
+
+var indices = []string{"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f", "[17]"}
+
+type Node interface {
+	Value() Node
+	Copy() Node // All nodes, for now, return them self
+	Dirty() bool
+	fstring(string) string
+	Hash() interface{}
+	RlpData() interface{}
+}
+
+// Value node
+func (self *ValueNode) String() string            { return self.fstring("") }
+func (self *FullNode) String() string             { return self.fstring("") }
+func (self *ShortNode) String() string            { return self.fstring("") }
+func (self *ValueNode) fstring(ind string) string { return fmt.Sprintf("%s ", self.data) }
+func (self *HashNode) fstring(ind string) string  { return fmt.Sprintf("%x ", self.key) }
+
+// Full node
+func (self *FullNode) fstring(ind string) string {
+	resp := fmt.Sprintf("[\n%s  ", ind)
+	for i, node := range self.nodes {
+		if node == nil {
+			resp += fmt.Sprintf("%s: <nil> ", indices[i])
+		} else {
+			resp += fmt.Sprintf("%s: %v", indices[i], node.fstring(ind+"  "))
+		}
+	}
+
+	return resp + fmt.Sprintf("\n%s] ", ind)
+}
+
+// Short node
+func (self *ShortNode) fstring(ind string) string {
+	return fmt.Sprintf("[ %s: %v ] ", self.key, self.value.fstring(ind+"  "))
+}
--- a/ptrie/shortnode.go
+++ b/ptrie/shortnode.go
@ -0,0 +1,31 @@
+package ptrie
+
+import "github.com/ethereum/go-ethereum/trie"
+
+type ShortNode struct {
+	trie  *Trie
+	key   []byte
+	value Node
+}
+
+func NewShortNode(t *Trie, key []byte, value Node) *ShortNode {
+	return &ShortNode{t, []byte(trie.CompactEncode(key)), value}
+}
+func (self *ShortNode) Value() Node {
+	self.value = self.trie.trans(self.value)
+
+	return self.value
+}
+func (self *ShortNode) Dirty() bool { return true }
+func (self *ShortNode) Copy() Node  { return NewShortNode(self.trie, self.key, self.value) }
+
+func (self *ShortNode) RlpData() interface{} {
+	return []interface{}{self.key, self.value.Hash()}
+}
+func (self *ShortNode) Hash() interface{} {
+	return self.trie.store(self)
+}
+
+func (self *ShortNode) Key() []byte {
+	return trie.CompactDecode(string(self.key))
+}
--- a/ptrie/trie.go
+++ b/ptrie/trie.go
@ -0,0 +1,312 @@
+package ptrie
+
+import (
+	"bytes"
+	"container/list"
+	"fmt"
+	"sync"
+
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/ethutil"
+	"github.com/ethereum/go-ethereum/trie"
+)
+
+func ParanoiaCheck(t1 *Trie, backend Backend) (bool, *Trie) {
+	t2 := New(nil, backend)
+
+	it := t1.Iterator()
+	for it.Next() {
+		t2.Update(it.Key, it.Value)
+	}
+
+	return bytes.Compare(t2.Hash(), t1.Hash()) == 0, t2
+}
+
+type Trie struct {
+	mu       sync.Mutex
+	root     Node
+	roothash []byte
+	cache    *Cache
+
+	revisions *list.List
+}
+
+func New(root []byte, backend Backend) *Trie {
+	trie := &Trie{}
+	trie.revisions = list.New()
+	trie.roothash = root
+	trie.cache = NewCache(backend)
+
+	if root != nil {
+		value := ethutil.NewValueFromBytes(trie.cache.Get(root))
+		trie.root = trie.mknode(value)
+	}
+
+	return trie
+}
+
+func (self *Trie) Iterator() *Iterator {
+	return NewIterator(self)
+}
+
+// Legacy support
+func (self *Trie) Root() []byte { return self.Hash() }
+func (self *Trie) Hash() []byte {
+	var hash []byte
+	if self.root != nil {
+		//hash = self.root.Hash().([]byte)
+		t := self.root.Hash()
+		if byts, ok := t.([]byte); ok {
+			hash = byts
+		} else {
+			hash = crypto.Sha3(ethutil.Encode(self.root.RlpData()))
+		}
+	} else {
+		hash = crypto.Sha3(ethutil.Encode(""))
+	}
+
+	if !bytes.Equal(hash, self.roothash) {
+		self.revisions.PushBack(self.roothash)
+		self.roothash = hash
+	}
+
+	return hash
+}
+func (self *Trie) Commit() {
+	// Hash first
+	self.Hash()
+
+	self.cache.Flush()
+}
+
+// Reset should only be called if the trie has been hashed
+func (self *Trie) Reset() {
+	self.cache.Reset()
+
+	revision := self.revisions.Remove(self.revisions.Back()).([]byte)
+	self.roothash = revision
+	value := ethutil.NewValueFromBytes(self.cache.Get(self.roothash))
+	self.root = self.mknode(value)
+}
+
+func (self *Trie) UpdateString(key, value string) Node { return self.Update([]byte(key), []byte(value)) }
+func (self *Trie) Update(key, value []byte) Node {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+
+	k := trie.CompactHexDecode(string(key))
+
+	if len(value) != 0 {
+		self.root = self.insert(self.root, k, &ValueNode{self, value})
+	} else {
+		self.root = self.delete(self.root, k)
+	}
+
+	return self.root
+}
+
+func (self *Trie) GetString(key string) []byte { return self.Get([]byte(key)) }
+func (self *Trie) Get(key []byte) []byte {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+
+	k := trie.CompactHexDecode(string(key))
+
+	n := self.get(self.root, k)
+	if n != nil {
+		return n.(*ValueNode).Val()
+	}
+
+	return nil
+}
+
+func (self *Trie) DeleteString(key string) Node { return self.Delete([]byte(key)) }
+func (self *Trie) Delete(key []byte) Node {
+	self.mu.Lock()
+	defer self.mu.Unlock()
+
+	k := trie.CompactHexDecode(string(key))
+	self.root = self.delete(self.root, k)
+
+	return self.root
+}
+
+func (self *Trie) insert(node Node, key []byte, value Node) Node {
+	if len(key) == 0 {
+		return value
+	}
+
+	if node == nil {
+		return NewShortNode(self, key, value)
+	}
+
+	switch node := node.(type) {
+	case *ShortNode:
+		k := node.Key()
+		cnode := node.Value()
+		if bytes.Equal(k, key) {
+			return NewShortNode(self, key, value)
+		}
+
+		var n Node
+		matchlength := trie.MatchingNibbleLength(key, k)
+		if matchlength == len(k) {
+			n = self.insert(cnode, key[matchlength:], value)
+		} else {
+			pnode := self.insert(nil, k[matchlength+1:], cnode)
+			nnode := self.insert(nil, key[matchlength+1:], value)
+			fulln := NewFullNode(self)
+			fulln.set(k[matchlength], pnode)
+			fulln.set(key[matchlength], nnode)
+			n = fulln
+		}
+		if matchlength == 0 {
+			return n
+		}
+
+		return NewShortNode(self, key[:matchlength], n)
+
+	case *FullNode:
+		cpy := node.Copy().(*FullNode)
+		cpy.set(key[0], self.insert(node.branch(key[0]), key[1:], value))
+
+		return cpy
+
+	default:
+		panic("Invalid node")
+	}
+}
+
+func (self *Trie) get(node Node, key []byte) Node {
+	if len(key) == 0 {
+		return node
+	}
+
+	if node == nil {
+		return nil
+	}
+
+	switch node := node.(type) {
+	case *ShortNode:
+		k := node.Key()
+		cnode := node.Value()
+
+		if len(key) >= len(k) && bytes.Equal(k, key[:len(k)]) {
+			return self.get(cnode, key[len(k):])
+		}
+
+		return nil
+	case *FullNode:
+		return self.get(node.branch(key[0]), key[1:])
+	default:
+		panic(fmt.Sprintf("%T: invalid node: %v", node, node))
+	}
+}
+
+func (self *Trie) delete(node Node, key []byte) Node {
+	if len(key) == 0 {
+		return nil
+	}
+
+	switch node := node.(type) {
+	case *ShortNode:
+		k := node.Key()
+		cnode := node.Value()
+		if bytes.Equal(key, k) {
+			return nil
+		} else if bytes.Equal(key[:len(k)], k) {
+			child := self.delete(cnode, key[len(k):])
+
+			var n Node
+			switch child := child.(type) {
+			case *ShortNode:
+				nkey := append(k, child.Key()...)
+				n = NewShortNode(self, nkey, child.Value())
+			case *FullNode:
+				n = NewShortNode(self, node.key, child)
+			}
+
+			return n
+		} else {
+			return node
+		}
+
+	case *FullNode:
+		n := node.Copy().(*FullNode)
+		n.set(key[0], self.delete(n.branch(key[0]), key[1:]))
+
+		pos := -1
+		for i := 0; i < 17; i++ {
+			if n.branch(byte(i)) != nil {
+				if pos == -1 {
+					pos = i
+				} else {
+					pos = -2
+				}
+			}
+		}
+
+		var nnode Node
+		if pos == 16 {
+			nnode = NewShortNode(self, []byte{16}, n.branch(byte(pos)))
+		} else if pos >= 0 {
+			cnode := n.branch(byte(pos))
+			switch cnode := cnode.(type) {
+			case *ShortNode:
+				// Stitch keys
+				k := append([]byte{byte(pos)}, cnode.Key()...)
+				nnode = NewShortNode(self, k, cnode.Value())
+			case *FullNode:
+				nnode = NewShortNode(self, []byte{byte(pos)}, n.branch(byte(pos)))
+			}
+		} else {
+			nnode = n
+		}
+
+		return nnode
+
+	default:
+		panic("Invalid node")
+	}
+}
+
+// casting functions and cache storing
+func (self *Trie) mknode(value *ethutil.Value) Node {
+	l := value.Len()
+	switch l {
+	case 2:
+		return NewShortNode(self, trie.CompactDecode(string(value.Get(0).Bytes())), self.mknode(value.Get(1)))
+	case 17:
+		fnode := NewFullNode(self)
+		for i := 0; i < l; i++ {
+			fnode.set(byte(i), self.mknode(value.Get(i)))
+		}
+		return fnode
+	case 32:
+		return &HashNode{value.Bytes()}
+	default:
+		return &ValueNode{self, value.Bytes()}
+	}
+}
+
+func (self *Trie) trans(node Node) Node {
+	switch node := node.(type) {
+	case *HashNode:
+		value := ethutil.NewValueFromBytes(self.cache.Get(node.key))
+		return self.mknode(value)
+	default:
+		return node
+	}
+}
+
+func (self *Trie) store(node Node) interface{} {
+	data := ethutil.Encode(node)
+	if len(data) >= 32 {
+		key := crypto.Sha3(data)
+		self.cache.Put(key, data)
+
+		return key
+	}
+
+	return node.RlpData()
+}
--- a/ptrie/trie_test.go
+++ b/ptrie/trie_test.go
@ -0,0 +1,259 @@
+package ptrie
+
+import (
+	"bytes"
+	"fmt"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/ethutil"
+)
+
+type Db map[string][]byte
+
+func (self Db) Get(k []byte) ([]byte, error) { return self[string(k)], nil }
+func (self Db) Put(k, v []byte)              { self[string(k)] = v }
+
+// Used for testing
+func NewEmpty() *Trie {
+	return New(nil, make(Db))
+}
+
+func TestEmptyTrie(t *testing.T) {
+	trie := NewEmpty()
+	res := trie.Hash()
+	exp := crypto.Sha3(ethutil.Encode(""))
+	if !bytes.Equal(res, exp) {
+		t.Errorf("expected %x got %x", exp, res)
+	}
+}
+
+func TestInsert(t *testing.T) {
+	trie := NewEmpty()
+
+	trie.UpdateString("doe", "reindeer")
+	trie.UpdateString("dog", "puppy")
+	trie.UpdateString("dogglesworth", "cat")
+
+	exp := ethutil.Hex2Bytes("8aad789dff2f538bca5d8ea56e8abe10f4c7ba3a5dea95fea4cd6e7c3a1168d3")
+	root := trie.Hash()
+	if !bytes.Equal(root, exp) {
+		t.Errorf("exp %x got %x", exp, root)
+	}
+
+	trie = NewEmpty()
+	trie.UpdateString("A", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
+
+	exp = ethutil.Hex2Bytes("d23786fb4a010da3ce639d66d5e904a11dbc02746d1ce25029e53290cabf28ab")
+	root = trie.Hash()
+	if !bytes.Equal(root, exp) {
+		t.Errorf("exp %x got %x", exp, root)
+	}
+}
+
+func TestGet(t *testing.T) {
+	trie := NewEmpty()
+
+	trie.UpdateString("doe", "reindeer")
+	trie.UpdateString("dog", "puppy")
+	trie.UpdateString("dogglesworth", "cat")
+
+	res := trie.GetString("dog")
+	if !bytes.Equal(res, []byte("puppy")) {
+		t.Errorf("expected puppy got %x", res)
+	}
+
+	unknown := trie.GetString("unknown")
+	if unknown != nil {
+		t.Errorf("expected nil got %x", unknown)
+	}
+}
+
+func TestDelete(t *testing.T) {
+	trie := NewEmpty()
+
+	vals := []struct{ k, v string }{
+		{"do", "verb"},
+		{"ether", "wookiedoo"},
+		{"horse", "stallion"},
+		{"shaman", "horse"},
+		{"doge", "coin"},
+		{"ether", ""},
+		{"dog", "puppy"},
+		{"shaman", ""},
+	}
+	for _, val := range vals {
+		if val.v != "" {
+			trie.UpdateString(val.k, val.v)
+		} else {
+			trie.DeleteString(val.k)
+		}
+	}
+
+	hash := trie.Hash()
+	exp := ethutil.Hex2Bytes("5991bb8c6514148a29db676a14ac506cd2cd5775ace63c30a4fe457715e9ac84")
+	if !bytes.Equal(hash, exp) {
+		t.Errorf("expected %x got %x", exp, hash)
+	}
+}
+
+func TestEmptyValues(t *testing.T) {
+	trie := NewEmpty()
+
+	vals := []struct{ k, v string }{
+		{"do", "verb"},
+		{"ether", "wookiedoo"},
+		{"horse", "stallion"},
+		{"shaman", "horse"},
+		{"doge", "coin"},
+		{"ether", ""},
+		{"dog", "puppy"},
+		{"shaman", ""},
+	}
+	for _, val := range vals {
+		trie.UpdateString(val.k, val.v)
+	}
+
+	hash := trie.Hash()
+	exp := ethutil.Hex2Bytes("5991bb8c6514148a29db676a14ac506cd2cd5775ace63c30a4fe457715e9ac84")
+	if !bytes.Equal(hash, exp) {
+		t.Errorf("expected %x got %x", exp, hash)
+	}
+}
+
+func TestReplication(t *testing.T) {
+	trie := NewEmpty()
+	vals := []struct{ k, v string }{
+		{"do", "verb"},
+		{"ether", "wookiedoo"},
+		{"horse", "stallion"},
+		{"shaman", "horse"},
+		{"doge", "coin"},
+		{"ether", ""},
+		{"dog", "puppy"},
+		{"shaman", ""},
+		{"somethingveryoddindeedthis is", "myothernodedata"},
+	}
+	for _, val := range vals {
+		trie.UpdateString(val.k, val.v)
+	}
+	trie.Commit()
+
+	trie2 := New(trie.roothash, trie.cache.backend)
+	if string(trie2.GetString("horse")) != "stallion" {
+		t.Error("expected to have harse => stallion")
+	}
+
+	hash := trie2.Hash()
+	exp := trie.Hash()
+	if !bytes.Equal(hash, exp) {
+		t.Errorf("root failure. expected %x got %x", exp, hash)
+	}
+
+}
+
+func TestReset(t *testing.T) {
+	trie := NewEmpty()
+	vals := []struct{ k, v string }{
+		{"do", "verb"},
+		{"ether", "wookiedoo"},
+		{"horse", "stallion"},
+	}
+	for _, val := range vals {
+		trie.UpdateString(val.k, val.v)
+	}
+	trie.Commit()
+
+	before := ethutil.CopyBytes(trie.roothash)
+	trie.UpdateString("should", "revert")
+	trie.Hash()
+	// Should have no effect
+	trie.Hash()
+	trie.Hash()
+	// ###
+
+	trie.Reset()
+	after := ethutil.CopyBytes(trie.roothash)
+
+	if !bytes.Equal(before, after) {
+		t.Errorf("expected roots to be equal. %x - %x", before, after)
+	}
+}
+
+func TestParanoia(t *testing.T) {
+	t.Skip()
+	trie := NewEmpty()
+
+	vals := []struct{ k, v string }{
+		{"do", "verb"},
+		{"ether", "wookiedoo"},
+		{"horse", "stallion"},
+		{"shaman", "horse"},
+		{"doge", "coin"},
+		{"ether", ""},
+		{"dog", "puppy"},
+		{"shaman", ""},
+		{"somethingveryoddindeedthis is", "myothernodedata"},
+	}
+	for _, val := range vals {
+		trie.UpdateString(val.k, val.v)
+	}
+	trie.Commit()
+
+	ok, t2 := ParanoiaCheck(trie, trie.cache.backend)
+	if !ok {
+		t.Errorf("trie paranoia check failed %x %x", trie.roothash, t2.roothash)
+	}
+}
+
+// Not an actual test
+func TestOutput(t *testing.T) {
+	t.Skip()
+
+	base := "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+	trie := NewEmpty()
+	for i := 0; i < 50; i++ {
+		trie.UpdateString(fmt.Sprintf("%s%d", base, i), "valueeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee")
+	}
+	fmt.Println("############################## FULL ################################")
+	fmt.Println(trie.root)
+
+	trie.Commit()
+	fmt.Println("############################## SMALL ################################")
+	trie2 := New(trie.roothash, trie.cache.backend)
+	trie2.GetString(base + "20")
+	fmt.Println(trie2.root)
+}
+
+func BenchmarkGets(b *testing.B) {
+	trie := NewEmpty()
+	vals := []struct{ k, v string }{
+		{"do", "verb"},
+		{"ether", "wookiedoo"},
+		{"horse", "stallion"},
+		{"shaman", "horse"},
+		{"doge", "coin"},
+		{"ether", ""},
+		{"dog", "puppy"},
+		{"shaman", ""},
+		{"somethingveryoddindeedthis is", "myothernodedata"},
+	}
+	for _, val := range vals {
+		trie.UpdateString(val.k, val.v)
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		trie.Get([]byte("horse"))
+	}
+}
+
+func BenchmarkUpdate(b *testing.B) {
+	trie := NewEmpty()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		trie.UpdateString(fmt.Sprintf("aaaaaaaaa%d", i), "value")
+	}
+	trie.Hash()
+}
--- a/ptrie/valuenode.go
+++ b/ptrie/valuenode.go
@ -0,0 +1,13 @@
+package ptrie
+
+type ValueNode struct {
+	trie *Trie
+	data []byte
+}
+
+func (self *ValueNode) Value() Node          { return self } // Best not to call :-)
+func (self *ValueNode) Val() []byte          { return self.data }
+func (self *ValueNode) Dirty() bool          { return true }
+func (self *ValueNode) Copy() Node           { return &ValueNode{self.trie, self.data} }
+func (self *ValueNode) RlpData() interface{} { return self.data }
+func (self *ValueNode) Hash() interface{}    { return self.data }
--- a/rlp/decode.go
+++ b/rlp/decode.go
@ -0,0 +1,667 @@
+package rlp
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"math/big"
+	"reflect"
+)
+
+var (
+	errNoPointer     = errors.New("rlp: interface given to Decode must be a pointer")
+	errDecodeIntoNil = errors.New("rlp: pointer given to Decode must not be nil")
+)
+
+// Decoder is implemented by types that require custom RLP
+// decoding rules or need to decode into private fields.
+//
+// The DecodeRLP method should read one value from the given
+// Stream. It is not forbidden to read less or more, but it might
+// be confusing.
+type Decoder interface {
+	DecodeRLP(*Stream) error
+}
+
+// Decode parses RLP-encoded data from r and stores the result
+// in the value pointed to by val. Val must be a non-nil pointer.
+//
+// Decode uses the following type-dependent decoding rules:
+//
+// If the type implements the Decoder interface, decode calls
+// DecodeRLP.
+//
+// To decode into a pointer, Decode will set the pointer to nil if the
+// input has size zero or the input is a single byte with value zero.
+// If the input has nonzero size, Decode will allocate a new value of
+// the type being pointed to.
+//
+// To decode into a struct, Decode expects the input to be an RLP
+// list. The decoded elements of the list are assigned to each public
+// field in the order given by the struct's definition. If the input
+// list has too few elements, no error is returned and the remaining
+// fields will have the zero value.
+// Recursive struct types are supported.
+//
+// To decode into a slice, the input must be a list and the resulting
+// slice will contain the input elements in order.
+// As a special case, if the slice has a byte-size element type, the input
+// can also be an RLP string.
+//
+// To decode into a Go string, the input must be an RLP string. The
+// bytes are taken as-is and will not necessarily be valid UTF-8.
+//
+// To decode into an integer type, the input must also be an RLP
+// string. The bytes are interpreted as a big endian representation of
+// the integer. If the RLP string is larger than the bit size of the
+// type, Decode will return an error. Decode also supports *big.Int.
+// There is no size limit for big integers.
+//
+// To decode into an interface value, Decode stores one of these
+// in the value:
+//
+//	[]interface{}, for RLP lists
+//	[]byte, for RLP strings
+//
+// Non-empty interface types are not supported, nor are bool, float32,
+// float64, maps, channel types and functions.
+func Decode(r ByteReader, val interface{}) error {
+	return NewStream(r).Decode(val)
+}
+
+func makeNumDecoder(typ reflect.Type) decoder {
+	kind := typ.Kind()
+	switch {
+	case kind <= reflect.Int64:
+		return decodeInt
+	case kind <= reflect.Uint64:
+		return decodeUint
+	default:
+		panic("fallthrough")
+	}
+}
+
+func decodeInt(s *Stream, val reflect.Value) error {
+	num, err := s.uint(val.Type().Bits())
+	if err != nil {
+		return err
+	}
+	val.SetInt(int64(num))
+	return nil
+}
+
+func decodeUint(s *Stream, val reflect.Value) error {
+	num, err := s.uint(val.Type().Bits())
+	if err != nil {
+		return err
+	}
+	val.SetUint(num)
+	return nil
+}
+
+func decodeString(s *Stream, val reflect.Value) error {
+	b, err := s.Bytes()
+	if err != nil {
+		return err
+	}
+	val.SetString(string(b))
+	return nil
+}
+
+func decodeBigIntNoPtr(s *Stream, val reflect.Value) error {
+	return decodeBigInt(s, val.Addr())
+}
+
+func decodeBigInt(s *Stream, val reflect.Value) error {
+	b, err := s.Bytes()
+	if err != nil {
+		return err
+	}
+	i := val.Interface().(*big.Int)
+	if i == nil {
+		i = new(big.Int)
+		val.Set(reflect.ValueOf(i))
+	}
+	i.SetBytes(b)
+	return nil
+}
+
+const maxInt = int(^uint(0) >> 1)
+
+func makeListDecoder(typ reflect.Type) (decoder, error) {
+	etype := typ.Elem()
+	if etype.Kind() == reflect.Uint8 && !reflect.PtrTo(etype).Implements(decoderInterface) {
+		if typ.Kind() == reflect.Array {
+			return decodeByteArray, nil
+		} else {
+			return decodeByteSlice, nil
+		}
+	}
+	etypeinfo, err := cachedTypeInfo1(etype)
+	if err != nil {
+		return nil, err
+	}
+	var maxLen = maxInt
+	if typ.Kind() == reflect.Array {
+		maxLen = typ.Len()
+	}
+	dec := func(s *Stream, val reflect.Value) error {
+		return decodeList(s, val, etypeinfo.decoder, maxLen)
+	}
+	return dec, nil
+}
+
+// decodeList decodes RLP list elements into slices and arrays.
+//
+// The approach here is stolen from package json, although we differ
+// in the semantics for arrays. package json discards remaining
+// elements that would not fit into the array. We generate an error in
+// this case because we'd be losing information.
+func decodeList(s *Stream, val reflect.Value, elemdec decoder, maxelem int) error {
+	size, err := s.List()
+	if err != nil {
+		return err
+	}
+	if size == 0 {
+		if val.Kind() == reflect.Slice {
+			val.Set(reflect.MakeSlice(val.Type(), 0, 0))
+		} else {
+			zero(val, 0)
+		}
+		return s.ListEnd()
+	}
+
+	i := 0
+	for {
+		if i > maxelem {
+			return fmt.Errorf("rlp: input List has more than %d elements", maxelem)
+		}
+		if val.Kind() == reflect.Slice {
+			// grow slice if necessary
+			if i >= val.Cap() {
+				newcap := val.Cap() + val.Cap()/2
+				if newcap < 4 {
+					newcap = 4
+				}
+				newv := reflect.MakeSlice(val.Type(), val.Len(), newcap)
+				reflect.Copy(newv, val)
+				val.Set(newv)
+			}
+			if i >= val.Len() {
+				val.SetLen(i + 1)
+			}
+		}
+		// decode into element
+		if err := elemdec(s, val.Index(i)); err == EOL {
+			break
+		} else if err != nil {
+			return err
+		}
+		i++
+	}
+	if i < val.Len() {
+		if val.Kind() == reflect.Array {
+			// zero the rest of the array.
+			zero(val, i)
+		} else {
+			val.SetLen(i)
+		}
+	}
+	return s.ListEnd()
+}
+
+func decodeByteSlice(s *Stream, val reflect.Value) error {
+	kind, _, err := s.Kind()
+	if err != nil {
+		return err
+	}
+	if kind == List {
+		return decodeList(s, val, decodeUint, maxInt)
+	}
+	b, err := s.Bytes()
+	if err == nil {
+		val.SetBytes(b)
+	}
+	return err
+}
+
+var errStringDoesntFitArray = errors.New("rlp: string value doesn't fit into target array")
+
+func decodeByteArray(s *Stream, val reflect.Value) error {
+	kind, size, err := s.Kind()
+	if err != nil {
+		return err
+	}
+	switch kind {
+	case Byte:
+		if val.Len() == 0 {
+			return errStringDoesntFitArray
+		}
+		bv, _ := s.Uint()
+		val.Index(0).SetUint(bv)
+		zero(val, 1)
+	case String:
+		if uint64(val.Len()) < size {
+			return errStringDoesntFitArray
+		}
+		slice := val.Slice(0, int(size)).Interface().([]byte)
+		if err := s.readFull(slice); err != nil {
+			return err
+		}
+		zero(val, int(size))
+	case List:
+		return decodeList(s, val, decodeUint, val.Len())
+	}
+	return nil
+}
+
+func zero(val reflect.Value, start int) {
+	z := reflect.Zero(val.Type().Elem())
+	for i := start; i < val.Len(); i++ {
+		val.Index(i).Set(z)
+	}
+}
+
+type field struct {
+	index int
+	info  *typeinfo
+}
+
+func makeStructDecoder(typ reflect.Type) (decoder, error) {
+	var fields []field
+	for i := 0; i < typ.NumField(); i++ {
+		if f := typ.Field(i); f.PkgPath == "" { // exported
+			info, err := cachedTypeInfo1(f.Type)
+			if err != nil {
+				return nil, err
+			}
+			fields = append(fields, field{i, info})
+		}
+	}
+	dec := func(s *Stream, val reflect.Value) (err error) {
+		if _, err = s.List(); err != nil {
+			return err
+		}
+		for _, f := range fields {
+			err = f.info.decoder(s, val.Field(f.index))
+			if err == EOL {
+				// too few elements. leave the rest at their zero value.
+				break
+			} else if err != nil {
+				return err
+			}
+		}
+		if err = s.ListEnd(); err == errNotAtEOL {
+			err = errors.New("rlp: input List has too many elements")
+		}
+		return err
+	}
+	return dec, nil
+}
+
+func makePtrDecoder(typ reflect.Type) (decoder, error) {
+	etype := typ.Elem()
+	etypeinfo, err := cachedTypeInfo1(etype)
+	if err != nil {
+		return nil, err
+	}
+	dec := func(s *Stream, val reflect.Value) (err error) {
+		_, size, err := s.Kind()
+		if err != nil || size == 0 && s.byteval == 0 {
+			val.Set(reflect.Zero(typ)) // set to nil
+			return err
+		}
+		newval := val
+		if val.IsNil() {
+			newval = reflect.New(etype)
+		}
+		if err = etypeinfo.decoder(s, newval.Elem()); err == nil {
+			val.Set(newval)
+		}
+		return err
+	}
+	return dec, nil
+}
+
+var ifsliceType = reflect.TypeOf([]interface{}{})
+
+func decodeInterface(s *Stream, val reflect.Value) error {
+	kind, _, err := s.Kind()
+	if err != nil {
+		return err
+	}
+	if kind == List {
+		slice := reflect.New(ifsliceType).Elem()
+		if err := decodeList(s, slice, decodeInterface, maxInt); err != nil {
+			return err
+		}
+		val.Set(slice)
+	} else {
+		b, err := s.Bytes()
+		if err != nil {
+			return err
+		}
+		val.Set(reflect.ValueOf(b))
+	}
+	return nil
+}
+
+// This decoder is used for non-pointer values of types
+// that implement the Decoder interface using a pointer receiver.
+func decodeDecoderNoPtr(s *Stream, val reflect.Value) error {
+	return val.Addr().Interface().(Decoder).DecodeRLP(s)
+}
+
+func decodeDecoder(s *Stream, val reflect.Value) error {
+	// Decoder instances are not handled using the pointer rule if the type
+	// implements Decoder with pointer receiver (i.e. always)
+	// because it might handle empty values specially.
+	// We need to allocate one here in this case, like makePtrDecoder does.
+	if val.Kind() == reflect.Ptr && val.IsNil() {
+		val.Set(reflect.New(val.Type().Elem()))
+	}
+	return val.Interface().(Decoder).DecodeRLP(s)
+}
+
+// Kind represents the kind of value contained in an RLP stream.
+type Kind int
+
+const (
+	Byte Kind = iota
+	String
+	List
+)
+
+func (k Kind) String() string {
+	switch k {
+	case Byte:
+		return "Byte"
+	case String:
+		return "String"
+	case List:
+		return "List"
+	default:
+		return fmt.Sprintf("Unknown(%d)", k)
+	}
+}
+
+var (
+	// EOL is returned when the end of the current list
+	// has been reached during streaming.
+	EOL = errors.New("rlp: end of list")
+
+	// Other errors
+	ErrExpectedString = errors.New("rlp: expected String or Byte")
+	ErrExpectedList   = errors.New("rlp: expected List")
+	ErrElemTooLarge   = errors.New("rlp: element is larger than containing list")
+
+	// internal errors
+	errNotInList = errors.New("rlp: call of ListEnd outside of any list")
+	errNotAtEOL  = errors.New("rlp: call of ListEnd not positioned at EOL")
+)
+
+// ByteReader must be implemented by any input reader for a Stream. It
+// is implemented by e.g. bufio.Reader and bytes.Reader.
+type ByteReader interface {
+	io.Reader
+	io.ByteReader
+}
+
+// Stream can be used for piecemeal decoding of an input stream. This
+// is useful if the input is very large or if the decoding rules for a
+// type depend on the input structure. Stream does not keep an
+// internal buffer. After decoding a value, the input reader will be
+// positioned just before the type information for the next value.
+//
+// When decoding a list and the input position reaches the declared
+// length of the list, all operations will return error EOL.
+// The end of the list must be acknowledged using ListEnd to continue
+// reading the enclosing list.
+//
+// Stream is not safe for concurrent use.
+type Stream struct {
+	r       ByteReader
+	uintbuf []byte
+
+	kind    Kind   // kind of value ahead
+	size    uint64 // size of value ahead
+	byteval byte   // value of single byte in type tag
+	stack   []listpos
+}
+
+type listpos struct{ pos, size uint64 }
+
+func NewStream(r ByteReader) *Stream {
+	return &Stream{r: r, uintbuf: make([]byte, 8), kind: -1}
+}
+
+// Bytes reads an RLP string and returns its contents as a byte slice.
+// If the input does not contain an RLP string, the returned
+// error will be ErrExpectedString.
+func (s *Stream) Bytes() ([]byte, error) {
+	kind, size, err := s.Kind()
+	if err != nil {
+		return nil, err
+	}
+	switch kind {
+	case Byte:
+		s.kind = -1 // rearm Kind
+		return []byte{s.byteval}, nil
+	case String:
+		b := make([]byte, size)
+		if err = s.readFull(b); err != nil {
+			return nil, err
+		}
+		return b, nil
+	default:
+		return nil, ErrExpectedString
+	}
+}
+
+// Uint reads an RLP string of up to 8 bytes and returns its contents
+// as an unsigned integer. If the input does not contain an RLP string, the
+// returned error will be ErrExpectedString.
+func (s *Stream) Uint() (uint64, error) {
+	return s.uint(64)
+}
+
+func (s *Stream) uint(maxbits int) (uint64, error) {
+	kind, size, err := s.Kind()
+	if err != nil {
+		return 0, err
+	}
+	switch kind {
+	case Byte:
+		s.kind = -1 // rearm Kind
+		return uint64(s.byteval), nil
+	case String:
+		if size > uint64(maxbits/8) {
+			return 0, fmt.Errorf("rlp: string is larger than %d bits", maxbits)
+		}
+		return s.readUint(byte(size))
+	default:
+		return 0, ErrExpectedString
+	}
+}
+
+// List starts decoding an RLP list. If the input does not contain a
+// list, the returned error will be ErrExpectedList. When the list's
+// end has been reached, any Stream operation will return EOL.
+func (s *Stream) List() (size uint64, err error) {
+	kind, size, err := s.Kind()
+	if err != nil {
+		return 0, err
+	}
+	if kind != List {
+		return 0, ErrExpectedList
+	}
+	s.stack = append(s.stack, listpos{0, size})
+	s.kind = -1
+	s.size = 0
+	return size, nil
+}
+
+// ListEnd returns to the enclosing list.
+// The input reader must be positioned at the end of a list.
+func (s *Stream) ListEnd() error {
+	if len(s.stack) == 0 {
+		return errNotInList
+	}
+	tos := s.stack[len(s.stack)-1]
+	if tos.pos != tos.size {
+		return errNotAtEOL
+	}
+	s.stack = s.stack[:len(s.stack)-1] // pop
+	if len(s.stack) > 0 {
+		s.stack[len(s.stack)-1].pos += tos.size
+	}
+	s.kind = -1
+	s.size = 0
+	return nil
+}
+
+// Decode decodes a value and stores the result in the value pointed
+// to by val. Please see the documentation for the Decode function
+// to learn about the decoding rules.
+func (s *Stream) Decode(val interface{}) error {
+	if val == nil {
+		return errDecodeIntoNil
+	}
+	rval := reflect.ValueOf(val)
+	rtyp := rval.Type()
+	if rtyp.Kind() != reflect.Ptr {
+		return errNoPointer
+	}
+	if rval.IsNil() {
+		return errDecodeIntoNil
+	}
+	info, err := cachedTypeInfo(rtyp.Elem())
+	if err != nil {
+		return err
+	}
+	return info.decoder(s, rval.Elem())
+}
+
+// Kind returns the kind and size of the next value in the
+// input stream.
+//
+// The returned size is the number of bytes that make up the value.
+// For kind == Byte, the size is zero because the value is
+// contained in the type tag.
+//
+// The first call to Kind will read size information from the input
+// reader and leave it positioned at the start of the actual bytes of
+// the value. Subsequent calls to Kind (until the value is decoded)
+// will not advance the input reader and return cached information.
+func (s *Stream) Kind() (kind Kind, size uint64, err error) {
+	var tos *listpos
+	if len(s.stack) > 0 {
+		tos = &s.stack[len(s.stack)-1]
+	}
+	if s.kind < 0 {
+		if tos != nil && tos.pos == tos.size {
+			return 0, 0, EOL
+		}
+		kind, size, err = s.readKind()
+		if err != nil {
+			return 0, 0, err
+		}
+		s.kind, s.size = kind, size
+	}
+	if tos != nil && tos.pos+s.size > tos.size {
+		return 0, 0, ErrElemTooLarge
+	}
+	return s.kind, s.size, nil
+}
+
+func (s *Stream) readKind() (kind Kind, size uint64, err error) {
+	b, err := s.readByte()
+	if err != nil {
+		return 0, 0, err
+	}
+	s.byteval = 0
+	switch {
+	case b < 0x80:
+		// For a single byte whose value is in the [0x00, 0x7F] range, that byte
+		// is its own RLP encoding.
+		s.byteval = b
+		return Byte, 0, nil
+	case b < 0xB8:
+		// Otherwise, if a string is 0-55 bytes long,
+		// the RLP encoding consists of a single byte with value 0x80 plus the
+		// length of the string followed by the string. The range of the first
+		// byte is thus [0x80, 0xB7].
+		return String, uint64(b - 0x80), nil
+	case b < 0xC0:
+		// If a string is more than 55 bytes long, the
+		// RLP encoding consists of a single byte with value 0xB7 plus the length
+		// of the length of the string in binary form, followed by the length of
+		// the string, followed by the string. For example, a length-1024 string
+		// would be encoded as 0xB90400 followed by the string. The range of
+		// the first byte is thus [0xB8, 0xBF].
+		size, err = s.readUint(b - 0xB7)
+		return String, size, err
+	case b < 0xF8:
+		// If the total payload of a list
+		// (i.e. the combined length of all its items) is 0-55 bytes long, the
+		// RLP encoding consists of a single byte with value 0xC0 plus the length
+		// of the list followed by the concatenation of the RLP encodings of the
+		// items. The range of the first byte is thus [0xC0, 0xF7].
+		return List, uint64(b - 0xC0), nil
+	default:
+		// If the total payload of a list is more than 55 bytes long,
+		// the RLP encoding consists of a single byte with value 0xF7
+		// plus the length of the length of the payload in binary
+		// form, followed by the length of the payload, followed by
+		// the concatenation of the RLP encodings of the items. The
+		// range of the first byte is thus [0xF8, 0xFF].
+		size, err = s.readUint(b - 0xF7)
+		return List, size, err
+	}
+}
+
+func (s *Stream) readUint(size byte) (uint64, error) {
+	if size == 1 {
+		b, err := s.readByte()
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		return uint64(b), err
+	}
+	start := int(8 - size)
+	for i := 0; i < start; i++ {
+		s.uintbuf[i] = 0
+	}
+	err := s.readFull(s.uintbuf[start:])
+	return binary.BigEndian.Uint64(s.uintbuf), err
+}
+
+func (s *Stream) readFull(buf []byte) (err error) {
+	s.willRead(uint64(len(buf)))
+	var nn, n int
+	for n < len(buf) && err == nil {
+		nn, err = s.r.Read(buf[n:])
+		n += nn
+	}
+	if err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	}
+	return err
+}
+
+func (s *Stream) readByte() (byte, error) {
+	s.willRead(1)
+	b, err := s.r.ReadByte()
+	if len(s.stack) > 0 && err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	}
+	return b, err
+}
+
+func (s *Stream) willRead(n uint64) {
+	s.kind = -1 // rearm Kind
+	if len(s.stack) > 0 {
+		s.stack[len(s.stack)-1].pos += n
+	}
+}
--- a/rlp/decode_test.go
+++ b/rlp/decode_test.go
@ -0,0 +1,476 @@
+package rlp
+
+import (
+	"bytes"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"math/big"
+	"reflect"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/ethutil"
+)
+
+func TestStreamKind(t *testing.T) {
+	tests := []struct {
+		input    string
+		wantKind Kind
+		wantLen  uint64
+	}{
+		{"00", Byte, 0},
+		{"01", Byte, 0},
+		{"7F", Byte, 0},
+		{"80", String, 0},
+		{"B7", String, 55},
+		{"B800", String, 0},
+		{"B90400", String, 1024},
+		{"BA000400", String, 1024},
+		{"BB00000400", String, 1024},
+		{"BFFFFFFFFFFFFFFFFF", String, ^uint64(0)},
+		{"C0", List, 0},
+		{"C8", List, 8},
+		{"F7", List, 55},
+		{"F800", List, 0},
+		{"F804", List, 4},
+		{"F90400", List, 1024},
+		{"FFFFFFFFFFFFFFFFFF", List, ^uint64(0)},
+	}
+
+	for i, test := range tests {
+		s := NewStream(bytes.NewReader(unhex(test.input)))
+		kind, len, err := s.Kind()
+		if err != nil {
+			t.Errorf("test %d: Type returned error: %v", i, err)
+			continue
+		}
+		if kind != test.wantKind {
+			t.Errorf("test %d: kind mismatch: got %d, want %d", i, kind, test.wantKind)
+		}
+		if len != test.wantLen {
+			t.Errorf("test %d: len mismatch: got %d, want %d", i, len, test.wantLen)
+		}
+	}
+}
+
+func TestStreamErrors(t *testing.T) {
+	type calls []string
+	tests := []struct {
+		string
+		calls
+		error
+	}{
+		{"", calls{"Kind"}, io.EOF},
+		{"", calls{"List"}, io.EOF},
+		{"", calls{"Uint"}, io.EOF},
+		{"C0", calls{"Bytes"}, ErrExpectedString},
+		{"C0", calls{"Uint"}, ErrExpectedString},
+		{"81", calls{"Bytes"}, io.ErrUnexpectedEOF},
+		{"81", calls{"Uint"}, io.ErrUnexpectedEOF},
+		{"BFFFFFFFFFFFFFFF", calls{"Bytes"}, io.ErrUnexpectedEOF},
+		{"89000000000000000001", calls{"Uint"}, errors.New("rlp: string is larger than 64 bits")},
+		{"00", calls{"List"}, ErrExpectedList},
+		{"80", calls{"List"}, ErrExpectedList},
+		{"C0", calls{"List", "Uint"}, EOL},
+		{"C801", calls{"List", "Uint", "Uint"}, io.ErrUnexpectedEOF},
+		{"C8C9", calls{"List", "Kind"}, ErrElemTooLarge},
+		{"C3C2010201", calls{"List", "List", "Uint", "Uint", "ListEnd", "Uint"}, EOL},
+		{"00", calls{"ListEnd"}, errNotInList},
+		{"C40102", calls{"List", "Uint", "ListEnd"}, errNotAtEOL},
+	}
+
+testfor:
+	for i, test := range tests {
+		s := NewStream(bytes.NewReader(unhex(test.string)))
+		rs := reflect.ValueOf(s)
+		for j, call := range test.calls {
+			fval := rs.MethodByName(call)
+			ret := fval.Call(nil)
+			err := "<nil>"
+			if lastret := ret[len(ret)-1].Interface(); lastret != nil {
+				err = lastret.(error).Error()
+			}
+			if j == len(test.calls)-1 {
+				if err != test.error.Error() {
+					t.Errorf("test %d: last call (%s) error mismatch\ngot:  %s\nwant: %v",
+						i, call, err, test.error)
+				}
+			} else if err != "<nil>" {
+				t.Errorf("test %d: call %d (%s) unexpected error: %q", i, j, call, err)
+				continue testfor
+			}
+		}
+	}
+}
+
+func TestStreamList(t *testing.T) {
+	s := NewStream(bytes.NewReader(unhex("C80102030405060708")))
+
+	len, err := s.List()
+	if err != nil {
+		t.Fatalf("List error: %v", err)
+	}
+	if len != 8 {
+		t.Fatalf("List returned invalid length, got %d, want 8", len)
+	}
+
+	for i := uint64(1); i <= 8; i++ {
+		v, err := s.Uint()
+		if err != nil {
+			t.Fatalf("Uint error: %v", err)
+		}
+		if i != v {
+			t.Errorf("Uint returned wrong value, got %d, want %d", v, i)
+		}
+	}
+
+	if _, err := s.Uint(); err != EOL {
+		t.Errorf("Uint error mismatch, got %v, want %v", err, EOL)
+	}
+	if err = s.ListEnd(); err != nil {
+		t.Fatalf("ListEnd error: %v", err)
+	}
+}
+
+func TestDecodeErrors(t *testing.T) {
+	r := bytes.NewReader(nil)
+
+	if err := Decode(r, nil); err != errDecodeIntoNil {
+		t.Errorf("Decode(r, nil) error mismatch, got %q, want %q", err, errDecodeIntoNil)
+	}
+
+	var nilptr *struct{}
+	if err := Decode(r, nilptr); err != errDecodeIntoNil {
+		t.Errorf("Decode(r, nilptr) error mismatch, got %q, want %q", err, errDecodeIntoNil)
+	}
+
+	if err := Decode(r, struct{}{}); err != errNoPointer {
+		t.Errorf("Decode(r, struct{}{}) error mismatch, got %q, want %q", err, errNoPointer)
+	}
+
+	expectErr := "rlp: type chan bool is not RLP-serializable"
+	if err := Decode(r, new(chan bool)); err == nil || err.Error() != expectErr {
+		t.Errorf("Decode(r, new(chan bool)) error mismatch, got %q, want %q", err, expectErr)
+	}
+
+	if err := Decode(r, new(int)); err != io.EOF {
+		t.Errorf("Decode(r, new(int)) error mismatch, got %q, want %q", err, io.EOF)
+	}
+}
+
+type decodeTest struct {
+	input string
+	ptr   interface{}
+	value interface{}
+	error error
+}
+
+type simplestruct struct {
+	A int
+	B string
+}
+
+type recstruct struct {
+	I     int
+	Child *recstruct
+}
+
+var (
+	veryBigInt = big.NewInt(0).Add(
+		big.NewInt(0).Lsh(big.NewInt(0xFFFFFFFFFFFFFF), 16),
+		big.NewInt(0xFFFF),
+	)
+)
+
+var (
+	sharedByteArray [5]byte
+	sharedPtr       = new(*int)
+)
+
+var decodeTests = []decodeTest{
+	// integers
+	{input: "05", ptr: new(uint32), value: uint32(5)},
+	{input: "80", ptr: new(uint32), value: uint32(0)},
+	{input: "8105", ptr: new(uint32), value: uint32(5)},
+	{input: "820505", ptr: new(uint32), value: uint32(0x0505)},
+	{input: "83050505", ptr: new(uint32), value: uint32(0x050505)},
+	{input: "8405050505", ptr: new(uint32), value: uint32(0x05050505)},
+	{input: "850505050505", ptr: new(uint32), error: errors.New("rlp: string is larger than 32 bits")},
+	{input: "C0", ptr: new(uint32), error: ErrExpectedString},
+
+	// slices
+	{input: "C0", ptr: new([]int), value: []int{}},
+	{input: "C80102030405060708", ptr: new([]int), value: []int{1, 2, 3, 4, 5, 6, 7, 8}},
+
+	// arrays
+	{input: "C0", ptr: new([5]int), value: [5]int{}},
+	{input: "C50102030405", ptr: new([5]int), value: [5]int{1, 2, 3, 4, 5}},
+	{input: "C6010203040506", ptr: new([5]int), error: errors.New("rlp: input List has more than 5 elements")},
+
+	// byte slices
+	{input: "01", ptr: new([]byte), value: []byte{1}},
+	{input: "80", ptr: new([]byte), value: []byte{}},
+	{input: "8D6162636465666768696A6B6C6D", ptr: new([]byte), value: []byte("abcdefghijklm")},
+	{input: "C0", ptr: new([]byte), value: []byte{}},
+	{input: "C3010203", ptr: new([]byte), value: []byte{1, 2, 3}},
+	{input: "C3820102", ptr: new([]byte), error: errors.New("rlp: string is larger than 8 bits")},
+
+	// byte arrays
+	{input: "01", ptr: new([5]byte), value: [5]byte{1}},
+	{input: "80", ptr: new([5]byte), value: [5]byte{}},
+	{input: "850102030405", ptr: new([5]byte), value: [5]byte{1, 2, 3, 4, 5}},
+	{input: "C0", ptr: new([5]byte), value: [5]byte{}},
+	{input: "C3010203", ptr: new([5]byte), value: [5]byte{1, 2, 3, 0, 0}},
+	{input: "C3820102", ptr: new([5]byte), error: errors.New("rlp: string is larger than 8 bits")},
+	{input: "86010203040506", ptr: new([5]byte), error: errStringDoesntFitArray},
+	{input: "850101", ptr: new([5]byte), error: io.ErrUnexpectedEOF},
+
+	// byte array reuse (should be zeroed)
+	{input: "850102030405", ptr: &sharedByteArray, value: [5]byte{1, 2, 3, 4, 5}},
+	{input: "8101", ptr: &sharedByteArray, value: [5]byte{1}}, // kind: String
+	{input: "850102030405", ptr: &sharedByteArray, value: [5]byte{1, 2, 3, 4, 5}},
+	{input: "01", ptr: &sharedByteArray, value: [5]byte{1}}, // kind: Byte
+	{input: "C3010203", ptr: &sharedByteArray, value: [5]byte{1, 2, 3, 0, 0}},
+	{input: "C101", ptr: &sharedByteArray, value: [5]byte{1}}, // kind: List
+
+	// zero sized byte arrays
+	{input: "80", ptr: new([0]byte), value: [0]byte{}},
+	{input: "C0", ptr: new([0]byte), value: [0]byte{}},
+	{input: "01", ptr: new([0]byte), error: errStringDoesntFitArray},
+	{input: "8101", ptr: new([0]byte), error: errStringDoesntFitArray},
+
+	// strings
+	{input: "00", ptr: new(string), value: "\000"},
+	{input: "8D6162636465666768696A6B6C6D", ptr: new(string), value: "abcdefghijklm"},
+	{input: "C0", ptr: new(string), error: ErrExpectedString},
+
+	// big ints
+	{input: "01", ptr: new(*big.Int), value: big.NewInt(1)},
+	{input: "89FFFFFFFFFFFFFFFFFF", ptr: new(*big.Int), value: veryBigInt},
+	{input: "10", ptr: new(big.Int), value: *big.NewInt(16)}, // non-pointer also works
+	{input: "C0", ptr: new(*big.Int), error: ErrExpectedString},
+
+	// structs
+	{input: "C0", ptr: new(simplestruct), value: simplestruct{0, ""}},
+	{input: "C105", ptr: new(simplestruct), value: simplestruct{5, ""}},
+	{input: "C50583343434", ptr: new(simplestruct), value: simplestruct{5, "444"}},
+	{input: "C3010101", ptr: new(simplestruct), error: errors.New("rlp: input List has too many elements")},
+	{
+		input: "C501C302C103",
+		ptr:   new(recstruct),
+		value: recstruct{1, &recstruct{2, &recstruct{3, nil}}},
+	},
+
+	// pointers
+	{input: "00", ptr: new(*int), value: (*int)(nil)},
+	{input: "80", ptr: new(*int), value: (*int)(nil)},
+	{input: "C0", ptr: new(*int), value: (*int)(nil)},
+	{input: "07", ptr: new(*int), value: intp(7)},
+	{input: "8108", ptr: new(*int), value: intp(8)},
+	{input: "C109", ptr: new(*[]int), value: &[]int{9}},
+	{input: "C58403030303", ptr: new(*[][]byte), value: &[][]byte{{3, 3, 3, 3}}},
+
+	// pointer should be reset to nil
+	{input: "05", ptr: sharedPtr, value: intp(5)},
+	{input: "80", ptr: sharedPtr, value: (*int)(nil)},
+
+	// interface{}
+	{input: "00", ptr: new(interface{}), value: []byte{0}},
+	{input: "01", ptr: new(interface{}), value: []byte{1}},
+	{input: "80", ptr: new(interface{}), value: []byte{}},
+	{input: "850505050505", ptr: new(interface{}), value: []byte{5, 5, 5, 5, 5}},
+	{input: "C0", ptr: new(interface{}), value: []interface{}{}},
+	{input: "C50183040404", ptr: new(interface{}), value: []interface{}{[]byte{1}, []byte{4, 4, 4}}},
+}
+
+func intp(i int) *int { return &i }
+
+func TestDecode(t *testing.T) {
+	for i, test := range decodeTests {
+		input, err := hex.DecodeString(test.input)
+		if err != nil {
+			t.Errorf("test %d: invalid hex input %q", i, test.input)
+			continue
+		}
+		err = Decode(bytes.NewReader(input), test.ptr)
+		if err != nil && test.error == nil {
+			t.Errorf("test %d: unexpected Decode error: %v\ndecoding into %T\ninput %q",
+				i, err, test.ptr, test.input)
+			continue
+		}
+		if test.error != nil && fmt.Sprint(err) != fmt.Sprint(test.error) {
+			t.Errorf("test %d: Decode error mismatch\ngot  %v\nwant %v\ndecoding into %T\ninput %q",
+				i, err, test.error, test.ptr, test.input)
+			continue
+		}
+		deref := reflect.ValueOf(test.ptr).Elem().Interface()
+		if err == nil && !reflect.DeepEqual(deref, test.value) {
+			t.Errorf("test %d: value mismatch\ngot  %#v\nwant %#v\ndecoding into %T\ninput %q",
+				i, deref, test.value, test.ptr, test.input)
+		}
+	}
+}
+
+type testDecoder struct{ called bool }
+
+func (t *testDecoder) DecodeRLP(s *Stream) error {
+	if _, err := s.Uint(); err != nil {
+		return err
+	}
+	t.called = true
+	return nil
+}
+
+func TestDecodeDecoder(t *testing.T) {
+	var s struct {
+		T1 testDecoder
+		T2 *testDecoder
+		T3 **testDecoder
+	}
+	if err := Decode(bytes.NewReader(unhex("C3010203")), &s); err != nil {
+		t.Fatalf("Decode error: %v", err)
+	}
+
+	if !s.T1.called {
+		t.Errorf("DecodeRLP was not called for (non-pointer) testDecoder")
+	}
+
+	if s.T2 == nil {
+		t.Errorf("*testDecoder has not been allocated")
+	} else if !s.T2.called {
+		t.Errorf("DecodeRLP was not called for *testDecoder")
+	}
+
+	if s.T3 == nil || *s.T3 == nil {
+		t.Errorf("**testDecoder has not been allocated")
+	} else if !(*s.T3).called {
+		t.Errorf("DecodeRLP was not called for **testDecoder")
+	}
+}
+
+type byteDecoder byte
+
+func (bd *byteDecoder) DecodeRLP(s *Stream) error {
+	_, err := s.Uint()
+	*bd = 255
+	return err
+}
+
+func (bd byteDecoder) called() bool {
+	return bd == 255
+}
+
+// This test verifies that the byte slice/byte array logic
+// does not kick in for element types implementing Decoder.
+func TestDecoderInByteSlice(t *testing.T) {
+	var slice []byteDecoder
+	if err := Decode(bytes.NewReader(unhex("C101")), &slice); err != nil {
+		t.Errorf("unexpected Decode error %v", err)
+	} else if !slice[0].called() {
+		t.Errorf("DecodeRLP not called for slice element")
+	}
+
+	var array [1]byteDecoder
+	if err := Decode(bytes.NewReader(unhex("C101")), &array); err != nil {
+		t.Errorf("unexpected Decode error %v", err)
+	} else if !array[0].called() {
+		t.Errorf("DecodeRLP not called for array element")
+	}
+}
+
+func ExampleDecode() {
+	input, _ := hex.DecodeString("C90A1486666F6F626172")
+
+	type example struct {
+		A, B    int
+		private int // private fields are ignored
+		String  string
+	}
+
+	var s example
+	err := Decode(bytes.NewReader(input), &s)
+	if err != nil {
+		fmt.Printf("Error: %v\n", err)
+	} else {
+		fmt.Printf("Decoded value: %#v\n", s)
+	}
+	// Output:
+	// Decoded value: rlp.example{A:10, B:20, private:0, String:"foobar"}
+}
+
+func ExampleStream() {
+	input, _ := hex.DecodeString("C90A1486666F6F626172")
+	s := NewStream(bytes.NewReader(input))
+
+	// Check what kind of value lies ahead
+	kind, size, _ := s.Kind()
+	fmt.Printf("Kind: %v size:%d\n", kind, size)
+
+	// Enter the list
+	if _, err := s.List(); err != nil {
+		fmt.Printf("List error: %v\n", err)
+		return
+	}
+
+	// Decode elements
+	fmt.Println(s.Uint())
+	fmt.Println(s.Uint())
+	fmt.Println(s.Bytes())
+
+	// Acknowledge end of list
+	if err := s.ListEnd(); err != nil {
+		fmt.Printf("ListEnd error: %v\n", err)
+	}
+	// Output:
+	// Kind: List size:9
+	// 10 <nil>
+	// 20 <nil>
+	// [102 111 111 98 97 114] <nil>
+}
+
+func BenchmarkDecode(b *testing.B) {
+	enc := encTest(90000)
+	b.SetBytes(int64(len(enc)))
+	b.ReportAllocs()
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		var s []int
+		r := bytes.NewReader(enc)
+		if err := Decode(r, &s); err != nil {
+			b.Fatalf("Decode error: %v", err)
+		}
+	}
+}
+
+func BenchmarkDecodeIntSliceReuse(b *testing.B) {
+	enc := encTest(100000)
+	b.SetBytes(int64(len(enc)))
+	b.ReportAllocs()
+	b.ResetTimer()
+
+	var s []int
+	for i := 0; i < b.N; i++ {
+		r := bytes.NewReader(enc)
+		if err := Decode(r, &s); err != nil {
+			b.Fatalf("Decode error: %v", err)
+		}
+	}
+}
+
+func encTest(n int) []byte {
+	s := make([]interface{}, n)
+	for i := 0; i < n; i++ {
+		s[i] = i
+	}
+	return ethutil.Encode(s)
+}
+
+func unhex(str string) []byte {
+	b, err := hex.DecodeString(str)
+	if err != nil {
+		panic(fmt.Sprintf("invalid hex string: %q", str))
+	}
+	return b
+}
--- a/rlp/doc.go
+++ b/rlp/doc.go
@ -0,0 +1,17 @@
+/*
+Package rlp implements the RLP serialization format.
+
+The purpose of RLP (Recursive Linear Prefix) qis to encode arbitrarily
+nested arrays of binary data, and RLP is the main encoding method used
+to serialize objects in Ethereum. The only purpose of RLP is to encode
+structure; encoding specific atomic data types (eg. strings, ints,
+floats) is left up to higher-order protocols; in Ethereum integers
+must be represented in big endian binary form with no leading zeroes
+(thus making the integer value zero be equivalent to the empty byte
+array).
+
+RLP values are distinguished by a type tag. The type tag precedes the
+value in the input stream and defines the size and kind of the bytes
+that follow.
+*/
+package rlp
--- a/rlp/typecache.go
+++ b/rlp/typecache.go
@ -0,0 +1,91 @@
+package rlp
+
+import (
+	"fmt"
+	"math/big"
+	"reflect"
+	"sync"
+)
+
+type decoder func(*Stream, reflect.Value) error
+
+type typeinfo struct {
+	decoder
+}
+
+var (
+	typeCacheMutex sync.RWMutex
+	typeCache      = make(map[reflect.Type]*typeinfo)
+)
+
+func cachedTypeInfo(typ reflect.Type) (*typeinfo, error) {
+	typeCacheMutex.RLock()
+	info := typeCache[typ]
+	typeCacheMutex.RUnlock()
+	if info != nil {
+		return info, nil
+	}
+	// not in the cache, need to generate info for this type.
+	typeCacheMutex.Lock()
+	defer typeCacheMutex.Unlock()
+	return cachedTypeInfo1(typ)
+}
+
+func cachedTypeInfo1(typ reflect.Type) (*typeinfo, error) {
+	info := typeCache[typ]
+	if info != nil {
+		// another goroutine got the write lock first
+		return info, nil
+	}
+	// put a dummmy value into the cache before generating.
+	// if the generator tries to lookup itself, it will get
+	// the dummy value and won't call itself recursively.
+	typeCache[typ] = new(typeinfo)
+	info, err := genTypeInfo(typ)
+	if err != nil {
+		// remove the dummy value if the generator fails
+		delete(typeCache, typ)
+		return nil, err
+	}
+	*typeCache[typ] = *info
+	return typeCache[typ], err
+}
+
+var (
+	decoderInterface = reflect.TypeOf(new(Decoder)).Elem()
+	bigInt           = reflect.TypeOf(big.Int{})
+)
+
+func genTypeInfo(typ reflect.Type) (info *typeinfo, err error) {
+	info = new(typeinfo)
+	kind := typ.Kind()
+	switch {
+	case typ.Implements(decoderInterface):
+		info.decoder = decodeDecoder
+	case kind != reflect.Ptr && reflect.PtrTo(typ).Implements(decoderInterface):
+		info.decoder = decodeDecoderNoPtr
+	case typ.AssignableTo(reflect.PtrTo(bigInt)):
+		info.decoder = decodeBigInt
+	case typ.AssignableTo(bigInt):
+		info.decoder = decodeBigIntNoPtr
+	case isInteger(kind):
+		info.decoder = makeNumDecoder(typ)
+	case kind == reflect.String:
+		info.decoder = decodeString
+	case kind == reflect.Slice || kind == reflect.Array:
+		info.decoder, err = makeListDecoder(typ)
+	case kind == reflect.Struct:
+		info.decoder, err = makeStructDecoder(typ)
+	case kind == reflect.Ptr:
+		info.decoder, err = makePtrDecoder(typ)
+	case kind == reflect.Interface && typ.NumMethod() == 0:
+		info.decoder = decodeInterface
+	default:
+		err = fmt.Errorf("rlp: type %v is not RLP-serializable", typ)
+	}
+	return info, err
+}
+
+func isInteger(k reflect.Kind) bool {
+	return k >= reflect.Int && k <= reflect.Uintptr
+}
--- a/state/dump.go
+++ b/state/dump.go
@ -46,3 +46,11 @@ func (self *State) Dump() []byte {

 	return json
 }
+
+// Debug stuff
+func (self *StateObject) CreateOutputForDiff() {
+	fmt.Printf("%x %x %x %x\n", self.Address(), self.State.Root(), self.balance.Bytes(), self.Nonce)
+	self.EachStorage(func(addr string, value *ethutil.Value) {
+		fmt.Printf("%x %x\n", addr, value.Bytes())
+	})
+}
--- a/state/state_object.go
+++ b/state/state_object.go
@ -148,9 +148,7 @@ func (self *StateObject) EachStorage(cb trie.EachCallback) {

 func (self *StateObject) Sync() {
 	for key, value := range self.storage {
-		if value.Len() == 0 { // value.BigInt().Cmp(ethutil.Big0) == 0 {
-			//data := self.getStorage([]byte(key))
-			//fmt.Printf("deleting %x %x 0x%x\n", self.Address(), []byte(key), data)
+		if value.Len() == 0 {
 			self.State.Trie.Delete(string(key))
 			continue
 		}
@ -287,14 +285,6 @@ func (self *StateObject) Root() []byte {
 	return self.State.Trie.GetRoot()
 }

-// Debug stuff
-func (self *StateObject) CreateOutputForDiff() {
-	fmt.Printf("%x %x %x %x\n", self.Address(), self.State.Root(), self.balance.Bytes(), self.Nonce)
-	self.EachStorage(func(addr string, value *ethutil.Value) {
-		fmt.Printf("%x %x\n", addr, value.Bytes())
-	})
-}
-
 //
 // Encoding
 //
--- a/trie/trie.go
+++ b/trie/trie.go
@ -197,7 +197,12 @@ func (t *Trie) Update(key, value string) {

 	k := CompactHexDecode(key)

-	root := t.UpdateState(t.Root, k, value)
+	var root interface{}
+	if value != "" {
+		root = t.UpdateState(t.Root, k, value)
+	} else {
+		root = t.deleteState(t.Root, k)
+	}
 	t.setRoot(root)
 }

--- a/trie/trie_test.go
+++ b/trie/trie_test.go
@ -1,12 +1,14 @@
 package trie

 import (
+	"bytes"
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
 	"math/rand"
 	"net/http"
+	"testing"
 	"time"

 	checker "gopkg.in/check.v1"
@ -387,3 +389,59 @@ func TestRndCase(t *testing.T) {
 	fmt.Printf("%x\n", trie.Get(string(ethutil.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))))
 }
 */
+
+func TestOtherSomething(t *testing.T) {
+	_, trie := NewTrie()
+
+	vals := []struct{ k, v string }{
+		{"do", "verb"},
+		{"ether", "wookiedoo"},
+		{"horse", "stallion"},
+		{"shaman", "horse"},
+		{"doge", "coin"},
+		{"ether", ""},
+		{"dog", "puppy"},
+		{"shaman", ""},
+	}
+	for _, val := range vals {
+		trie.Update(val.k, val.v)
+	}
+
+	exp := ethutil.Hex2Bytes("5991bb8c6514148a29db676a14ac506cd2cd5775ace63c30a4fe457715e9ac84")
+	hash := trie.Root.([]byte)
+	if !bytes.Equal(hash, exp) {
+		t.Errorf("expected %x got %x", exp, hash)
+	}
+}
+
+func BenchmarkGets(b *testing.B) {
+	_, trie := NewTrie()
+	vals := []struct{ k, v string }{
+		{"do", "verb"},
+		{"ether", "wookiedoo"},
+		{"horse", "stallion"},
+		{"shaman", "horse"},
+		{"doge", "coin"},
+		{"ether", ""},
+		{"dog", "puppy"},
+		{"shaman", ""},
+		{"somethingveryoddindeedthis is", "myothernodedata"},
+	}
+	for _, val := range vals {
+		trie.Update(val.k, val.v)
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		trie.Get("horse")
+	}
+}
+
+func BenchmarkUpdate(b *testing.B) {
+	_, trie := NewTrie()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		trie.Update(fmt.Sprintf("aaaaaaaaaaaaaaa%d", i), "value")
+	}
+}
--- a/vm/vm_debug.go
+++ b/vm/vm_debug.go
@ -805,7 +805,6 @@ func (self *DebugVm) RunClosure(closure *Closure) (ret []byte, err error) {
 			stack.Push(closure.Gas)
 			// 0x60 range
 		case CREATE:
-
 			var (
 				err          error
 				value        = stack.Pop()
--- a/xeth/hexface.go
+++ b/xeth/hexface.go
@ -6,6 +6,7 @@ import (
 	"sync/atomic"

 	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/state"
@ -209,7 +210,7 @@ func (self *JSXEth) Transact(key, toStr, valueStr, gasStr, gasPriceStr, codeStr
 		gas      = ethutil.Big(gasStr)
 		gasPrice = ethutil.Big(gasPriceStr)
 		data     []byte
-		tx       *chain.Transaction
+		tx       *types.Transaction
 	)

 	if ethutil.IsHex(codeStr) {
@ -219,9 +220,9 @@ func (self *JSXEth) Transact(key, toStr, valueStr, gasStr, gasPriceStr, codeStr
 	}

 	if contractCreation {
-		tx = chain.NewContractCreationTx(value, gas, gasPrice, data)
+		tx = types.NewContractCreationTx(value, gas, gasPrice, data)
 	} else {
-		tx = chain.NewTransactionMessage(hash, value, gas, gasPrice, data)
+		tx = types.NewTransactionMessage(hash, value, gas, gasPrice, data)
 	}

 	acc := self.obj.BlockManager().TransState().GetOrNewStateObject(keyPair.Address())
@ -240,7 +241,7 @@ func (self *JSXEth) Transact(key, toStr, valueStr, gasStr, gasPriceStr, codeStr
 }

 func (self *JSXEth) PushTx(txStr string) (*JSReceipt, error) {
-	tx := chain.NewTransactionFromBytes(ethutil.Hex2Bytes(txStr))
+	tx := types.NewTransactionFromBytes(ethutil.Hex2Bytes(txStr))
 	self.obj.TxPool().QueueTransaction(tx)
 	return NewJSReciept(tx.CreatesContract(), tx.CreationAddress(self.World().State()), tx.Hash(), tx.Sender()), nil
 }
--- a/xeth/js_types.go
+++ b/xeth/js_types.go
@ -6,6 +6,7 @@ import (
 	"strings"

 	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/state"
@ -14,7 +15,7 @@ import (
 // Block interface exposed to QML
 type JSBlock struct {
 	//Transactions string `json:"transactions"`
-	ref          *chain.Block
+	ref          *types.Block
 	Size         string        `json:"size"`
 	Number       int           `json:"number"`
 	Hash         string        `json:"hash"`
@ -31,7 +32,7 @@ type JSBlock struct {
 }

 // Creates a new QML Block from a chain block
-func NewJSBlock(block *chain.Block) *JSBlock {
+func NewJSBlock(block *types.Block) *JSBlock {
 	if block == nil {
 		return &JSBlock{}
 	}
@ -79,7 +80,7 @@ func (self *JSBlock) GetTransaction(hash string) *JSTransaction {
 }

 type JSTransaction struct {
-	ref *chain.Transaction
+	ref *types.Transaction

 	Value           string `json:"value"`
 	Gas             string `json:"gas"`
@ -94,7 +95,7 @@ type JSTransaction struct {
 	Confirmations   int    `json:"confirmations"`
 }

-func NewJSTx(tx *chain.Transaction, state *state.State) *JSTransaction {
+func NewJSTx(tx *types.Transaction, state *state.State) *JSTransaction {
 	hash := ethutil.Bytes2Hex(tx.Hash())
 	receiver := ethutil.Bytes2Hex(tx.Recipient)
 	if receiver == "0000000000000000000000000000000000000000" {
--- a/xeth/pipe.go
+++ b/xeth/pipe.go
@ -9,6 +9,7 @@ import (
 	"strings"

 	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/logger"
@ -72,7 +73,7 @@ func (self *XEth) ExecuteObject(object *Object, data []byte, value, gas, price *
 	return ret, err
 }

-func (self *XEth) Block(hash []byte) *chain.Block {
+func (self *XEth) Block(hash []byte) *types.Block {
 	return self.blockChain.GetBlock(hash)
 }

@ -115,7 +116,7 @@ func (self *XEth) Transact(key *crypto.KeyPair, rec []byte, value, gas, price *e
 		contractCreation = true
 	}

-	var tx *chain.Transaction
+	var tx *types.Transaction
 	// Compile and assemble the given data
 	if contractCreation {
 		script, err := ethutil.Compile(string(data), false)
@ -123,7 +124,7 @@ func (self *XEth) Transact(key *crypto.KeyPair, rec []byte, value, gas, price *e
 			return nil, err
 		}

-		tx = chain.NewContractCreationTx(value.BigInt(), gas.BigInt(), price.BigInt(), script)
+		tx = types.NewContractCreationTx(value.BigInt(), gas.BigInt(), price.BigInt(), script)
 	} else {
 		data := ethutil.StringToByteFunc(string(data), func(s string) (ret []byte) {
 			slice := strings.Split(s, "\n")
@ -134,7 +135,7 @@ func (self *XEth) Transact(key *crypto.KeyPair, rec []byte, value, gas, price *e
 			return
 		})

-		tx = chain.NewTransactionMessage(hash, value.BigInt(), gas.BigInt(), price.BigInt(), data)
+		tx = types.NewTransactionMessage(hash, value.BigInt(), gas.BigInt(), price.BigInt(), data)
 	}

 	acc := self.blockManager.TransState().GetOrNewStateObject(key.Address())
@ -155,7 +156,7 @@ func (self *XEth) Transact(key *crypto.KeyPair, rec []byte, value, gas, price *e
 	return tx.Hash(), nil
 }

-func (self *XEth) PushTx(tx *chain.Transaction) ([]byte, error) {
+func (self *XEth) PushTx(tx *types.Transaction) ([]byte, error) {
 	self.obj.TxPool().QueueTransaction(tx)
 	if tx.Recipient == nil {
 		addr := tx.CreationAddress(self.World().State())
--- a/xeth/vm_env.go
+++ b/xeth/vm_env.go
@ -2,20 +2,19 @@ package xeth

 import (
 	"math/big"
-
-	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/state"
 	"github.com/ethereum/go-ethereum/vm"
 )

 type VMEnv struct {
 	state  *state.State
-	block  *chain.Block
+	block  *types.Block
 	value  *big.Int
 	sender []byte
 }

-func NewEnv(state *state.State, block *chain.Block, value *big.Int, sender []byte) *VMEnv {
+func NewEnv(state *state.State, block *types.Block, value *big.Int, sender []byte) *VMEnv {
 	return &VMEnv{
 		state:  state,
 		block:  block,