diff --git a/README.md b/README.md
index 72e187db7..2627bc85e 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Ethereum
 Ethereum Go Development package (C) Jeffrey Wilcke
 
 Ethereum is currently in its testing phase. The current state is "Proof
-of Concept 5.0 RC4". For build instructions see the [Wiki](https://github.com/ethereum/go-ethereum/wiki/Building-Ethereum(Go)).
+of Concept 5.0 RC6". For build instructions see the [Wiki](https://github.com/ethereum/go-ethereum/wiki/Building-Ethereum(Go)).
 
 Ethereum Go is split up in several sub packages Please refer to each
 individual package for more information.
diff --git a/ethchain/keypair.go b/ethchain/keypair.go
deleted file mode 100644
index 0f23bacdf..000000000
--- a/ethchain/keypair.go
+++ /dev/null
@@ -1,87 +0,0 @@
-package ethchain
-
-import (
-	"github.com/ethereum/eth-go/ethutil"
-	"github.com/obscuren/secp256k1-go"
-	"math/big"
-)
-
-type KeyPair struct {
-	PrivateKey []byte
-	PublicKey  []byte
-
-	// The associated account
-	account *StateObject
-	state   *State
-}
-
-func NewKeyPairFromSec(seckey []byte) (*KeyPair, error) {
-	pubkey, err := secp256k1.GeneratePubKey(seckey)
-	if err != nil {
-		return nil, err
-	}
-
-	return &KeyPair{PrivateKey: seckey, PublicKey: pubkey}, nil
-}
-
-func NewKeyPairFromValue(val *ethutil.Value) *KeyPair {
-	keyPair := &KeyPair{PrivateKey: val.Get(0).Bytes(), PublicKey: val.Get(1).Bytes()}
-
-	return keyPair
-}
-
-func (k *KeyPair) Address() []byte {
-	return ethutil.Sha3Bin(k.PublicKey[1:])[12:]
-}
-
-func (k *KeyPair) Account() *StateObject {
-	if k.account == nil {
-		k.account = k.state.GetAccount(k.Address())
-	}
-
-	return k.account
-}
-
-// Create transaction, creates a new and signed transaction, ready for processing
-func (k *KeyPair) CreateTx(receiver []byte, value *big.Int, data []string) *Transaction {
-	/* TODO
-	tx := NewTransaction(receiver, value, data)
-	tx.Nonce = k.account.Nonce
-
-	// Sign the transaction with the private key in this key chain
-	tx.Sign(k.PrivateKey)
-
-	return tx
-	*/
-	return nil
-}
-
-func (k *KeyPair) RlpEncode() []byte {
-	return ethutil.EmptyValue().Append(k.PrivateKey).Append(k.PublicKey).Encode()
-}
-
-type KeyRing struct {
-	keys []*KeyPair
-}
-
-func (k *KeyRing) Add(pair *KeyPair) {
-	k.keys = append(k.keys, pair)
-}
-
-// The public "singleton" keyring
-var keyRing *KeyRing
-
-func GetKeyRing(state *State) *KeyRing {
-	if keyRing == nil {
-		keyRing = &KeyRing{}
-
-		data, _ := ethutil.Config.Db.Get([]byte("KeyRing"))
-		it := ethutil.NewValueFromBytes(data).NewIterator()
-		for it.Next() {
-			v := it.Value()
-			keyRing.Add(NewKeyPairFromValue(v))
-		}
-	}
-
-	return keyRing
-}
diff --git a/ethchain/state_manager.go b/ethchain/state_manager.go
index 8f1eb1ce5..57d56469b 100644
--- a/ethchain/state_manager.go
+++ b/ethchain/state_manager.go
@@ -200,6 +200,7 @@ func (sm *StateManager) ProcessBlock(block *Block, dontReact bool) error {
 
 		sm.Ethereum.Broadcast(ethwire.MsgBlockTy, []interface{}{block.Value().Val})
 
+		sm.Ethereum.TxPool().RemoveInvalid(sm.procState)
 	} else {
 		fmt.Println("total diff failed")
 	}
diff --git a/ethchain/transaction_pool.go b/ethchain/transaction_pool.go
index 56deae0c6..6c0282dc6 100644
--- a/ethchain/transaction_pool.go
+++ b/ethchain/transaction_pool.go
@@ -210,9 +210,9 @@ func (pool *TxPool) CurrentTransactions() []*Transaction {
 	txList := make([]*Transaction, pool.pool.Len())
 	i := 0
 	for e := pool.pool.Front(); e != nil; e = e.Next() {
-		if tx, ok := e.Value.(*Transaction); ok {
-			txList[i] = tx
-		}
+		tx := e.Value.(*Transaction)
+
+		txList[i] = tx
 
 		i++
 	}
@@ -220,6 +220,17 @@ func (pool *TxPool) CurrentTransactions() []*Transaction {
 	return txList
 }
 
+func (pool *TxPool) RemoveInvalid(state *State) {
+	for e := pool.pool.Front(); e != nil; e = e.Next() {
+		tx := e.Value.(*Transaction)
+		sender := state.GetAccount(tx.Sender())
+		err := pool.ValidateTransaction(tx)
+		if err != nil || sender.Nonce != tx.Nonce {
+			pool.pool.Remove(e)
+		}
+	}
+}
+
 func (pool *TxPool) Flush() []*Transaction {
 	txList := pool.CurrentTransactions()
 
diff --git a/ethdb/database.go b/ethdb/database.go
index 3dbff36de..09e9d8c7d 100644
--- a/ethdb/database.go
+++ b/ethdb/database.go
@@ -54,11 +54,13 @@ func (db *LDBDatabase) LastKnownTD() []byte {
 	return data
 }
 
+/*
 func (db *LDBDatabase) GetKeys() []*ethutil.Key {
 	data, _ := db.Get([]byte("KeyRing"))
 
 	return []*ethutil.Key{ethutil.NewKeyFromBytes(data)}
 }
+*/
 
 func (db *LDBDatabase) Close() {
 	// Close the leveldb database
diff --git a/ethdb/memory_database.go b/ethdb/memory_database.go
index b0fa64ed7..1e9d2899a 100644
--- a/ethdb/memory_database.go
+++ b/ethdb/memory_database.go
@@ -26,11 +26,13 @@ func (db *MemDatabase) Get(key []byte) ([]byte, error) {
 	return db.db[string(key)], nil
 }
 
+/*
 func (db *MemDatabase) GetKeys() []*ethutil.Key {
 	data, _ := db.Get([]byte("KeyRing"))
 
 	return []*ethutil.Key{ethutil.NewKeyFromBytes(data)}
 }
+*/
 
 func (db *MemDatabase) Delete(key []byte) error {
 	delete(db.db, string(key))
diff --git a/ethereum.go b/ethereum.go
index 94e338c56..83a74f302 100644
--- a/ethereum.go
+++ b/ethereum.go
@@ -138,6 +138,18 @@ func (s *Ethereum) IsMining() bool {
 func (s *Ethereum) PeerCount() int {
 	return s.peers.Len()
 }
+func (s *Ethereum) IsUpToDate() bool {
+	upToDate := true
+	eachPeer(s.peers, func(peer *Peer, e *list.Element) {
+		if atomic.LoadInt32(&peer.connected) == 1 {
+			if peer.catchingUp == true {
+				upToDate = false
+			}
+		}
+	})
+	return upToDate
+}
+
 func (s *Ethereum) IsListening() bool {
 	return s.listening
 }
diff --git a/ethpub/pub.go b/ethpub/pub.go
index 4d1536368..daacb9d78 100644
--- a/ethpub/pub.go
+++ b/ethpub/pub.go
@@ -39,10 +39,7 @@ func (lib *PEthereum) GetBlock(hexHash string) *PBlock {
 }
 
 func (lib *PEthereum) GetKey() *PKey {
-	keyPair, err := ethchain.NewKeyPairFromSec(ethutil.Config.Db.GetKeys()[0].PrivateKey)
-	if err != nil {
-		return nil
-	}
+	keyPair := ethutil.GetKeyRing().Get(0)
 
 	return NewPKey(keyPair)
 }
@@ -90,7 +87,7 @@ func (lib *PEthereum) IsContract(address string) bool {
 }
 
 func (lib *PEthereum) SecretToAddress(key string) string {
-	pair, err := ethchain.NewKeyPairFromSec(ethutil.FromHex(key))
+	pair, err := ethutil.NewKeyPairFromSec(ethutil.FromHex(key))
 	if err != nil {
 		return ""
 	}
@@ -115,12 +112,12 @@ func (lib *PEthereum) createTx(key, recipient, valueStr, gasStr, gasPriceStr, in
 		hash = ethutil.FromHex(recipient)
 	}
 
-	var keyPair *ethchain.KeyPair
+	var keyPair *ethutil.KeyPair
 	var err error
 	if key[0:2] == "0x" {
-		keyPair, err = ethchain.NewKeyPairFromSec([]byte(ethutil.FromHex(key[0:2])))
+		keyPair, err = ethutil.NewKeyPairFromSec([]byte(ethutil.FromHex(key[0:2])))
 	} else {
-		keyPair, err = ethchain.NewKeyPairFromSec([]byte(ethutil.FromHex(key)))
+		keyPair, err = ethutil.NewKeyPairFromSec([]byte(ethutil.FromHex(key)))
 	}
 
 	if err != nil {
diff --git a/ethpub/types.go b/ethpub/types.go
index 7f25e48a6..c902afc56 100644
--- a/ethpub/types.go
+++ b/ethpub/types.go
@@ -39,7 +39,7 @@ type PKey struct {
 	PublicKey  string `json:"publicKey"`
 }
 
-func NewPKey(key *ethchain.KeyPair) *PKey {
+func NewPKey(key *ethutil.KeyPair) *PKey {
 	return &PKey{ethutil.Hex(key.Address()), ethutil.Hex(key.PrivateKey), ethutil.Hex(key.PublicKey)}
 }
 
diff --git a/ethutil/config.go b/ethutil/config.go
index 07dc85f08..b4bd9158e 100644
--- a/ethutil/config.go
+++ b/ethutil/config.go
@@ -50,7 +50,7 @@ func ReadConfig(base string) *config {
 			}
 		}
 
-		Config = &config{ExecPath: path, Debug: true, Ver: "0.5.0 RC4"}
+		Config = &config{ExecPath: path, Debug: true, Ver: "0.5.0 RC6"}
 		Config.Log = NewLogger(LogFile|LogStd, LogLevelDebug)
 		Config.SetClientString("/Ethereum(G)")
 	}
diff --git a/ethutil/db.go b/ethutil/db.go
index abbf4a2b0..e02a80fca 100644
--- a/ethutil/db.go
+++ b/ethutil/db.go
@@ -4,7 +4,7 @@ package ethutil
 type Database interface {
 	Put(key []byte, value []byte)
 	Get(key []byte) ([]byte, error)
-	GetKeys() []*Key
+	//GetKeys() []*Key
 	Delete(key []byte) error
 	LastKnownTD() []byte
 	Close()
diff --git a/ethutil/key.go b/ethutil/key.go
deleted file mode 100644
index ec195f213..000000000
--- a/ethutil/key.go
+++ /dev/null
@@ -1,19 +0,0 @@
-package ethutil
-
-type Key struct {
-	PrivateKey []byte
-	PublicKey  []byte
-}
-
-func NewKeyFromBytes(data []byte) *Key {
-	val := NewValueFromBytes(data)
-	return &Key{val.Get(0).Bytes(), val.Get(1).Bytes()}
-}
-
-func (k *Key) Address() []byte {
-	return Sha3Bin(k.PublicKey[1:])[12:]
-}
-
-func (k *Key) RlpEncode() []byte {
-	return EmptyValue().Append(k.PrivateKey).Append(k.PublicKey).Encode()
-}
diff --git a/ethutil/keypair.go b/ethutil/keypair.go
new file mode 100644
index 000000000..cf5882e2c
--- /dev/null
+++ b/ethutil/keypair.go
@@ -0,0 +1,109 @@
+package ethutil
+
+import (
+	"github.com/obscuren/secp256k1-go"
+)
+
+type KeyPair struct {
+	PrivateKey []byte
+	PublicKey  []byte
+
+	// The associated account
+	account *StateObject
+}
+
+func NewKeyPairFromSec(seckey []byte) (*KeyPair, error) {
+	pubkey, err := secp256k1.GeneratePubKey(seckey)
+	if err != nil {
+		return nil, err
+	}
+
+	return &KeyPair{PrivateKey: seckey, PublicKey: pubkey}, nil
+}
+
+func NewKeyPairFromValue(val *Value) *KeyPair {
+	v, _ := NewKeyPairFromSec(val.Bytes())
+
+	return v
+}
+
+func (k *KeyPair) Address() []byte {
+	return Sha3Bin(k.PublicKey[1:])[12:]
+}
+
+func (k *KeyPair) RlpEncode() []byte {
+	return k.RlpValue().Encode()
+}
+
+func (k *KeyPair) RlpValue() *Value {
+	return NewValue(k.PrivateKey)
+}
+
+type KeyRing struct {
+	keys []*KeyPair
+}
+
+func (k *KeyRing) Add(pair *KeyPair) {
+	k.keys = append(k.keys, pair)
+}
+
+func (k *KeyRing) Get(i int) *KeyPair {
+	if len(k.keys) > i {
+		return k.keys[i]
+	}
+
+	return nil
+}
+
+func (k *KeyRing) Len() int {
+	return len(k.keys)
+}
+
+func (k *KeyRing) NewKeyPair(sec []byte) (*KeyPair, error) {
+	keyPair, err := NewKeyPairFromSec(sec)
+	if err != nil {
+		return nil, err
+	}
+
+	k.Add(keyPair)
+	Config.Db.Put([]byte("KeyRing"), k.RlpValue().Encode())
+
+	return keyPair, nil
+}
+
+func (k *KeyRing) Reset() {
+	Config.Db.Put([]byte("KeyRing"), nil)
+	k.keys = nil
+}
+
+func (k *KeyRing) RlpValue() *Value {
+	v := EmptyValue()
+	for _, keyPair := range k.keys {
+		v.Append(keyPair.RlpValue())
+	}
+
+	return v
+}
+
+// The public "singleton" keyring
+var keyRing *KeyRing
+
+func GetKeyRing() *KeyRing {
+	if keyRing == nil {
+		keyRing = &KeyRing{}
+
+		data, _ := Config.Db.Get([]byte("KeyRing"))
+		it := NewValueFromBytes(data).NewIterator()
+		for it.Next() {
+			v := it.Value()
+
+			key, err := NewKeyPairFromSec(v.Bytes())
+			if err != nil {
+				panic(err)
+			}
+			keyRing.Add(key)
+		}
+	}
+
+	return keyRing
+}
diff --git a/ethwire/messaging.go b/ethwire/messaging.go
index b622376f3..cbcbbb8b7 100644
--- a/ethwire/messaging.go
+++ b/ethwire/messaging.go
@@ -124,7 +124,7 @@ func ReadMessages(conn net.Conn) (msgs []*Msg, err error) {
 	var totalBytes int
 	for {
 		// Give buffering some time
-		conn.SetReadDeadline(time.Now().Add(20 * time.Millisecond))
+		conn.SetReadDeadline(time.Now().Add(500 * time.Millisecond))
 		// Create a new temporarily buffer
 		b := make([]byte, 1440)
 		// Wait for a message from this peer
@@ -134,7 +134,6 @@ func ReadMessages(conn net.Conn) (msgs []*Msg, err error) {
 				fmt.Println("err now", err)
 				return nil, err
 			} else {
-				fmt.Println("IOF NOW")
 				break
 			}
 
diff --git a/peer.go b/peer.go
index 932dbdc18..4093a4902 100644
--- a/peer.go
+++ b/peer.go
@@ -187,6 +187,10 @@ func NewOutboundPeer(addr string, ethereum *Ethereum, caps Caps) *Peer {
 
 // Outputs any RLP encoded data to the peer
 func (p *Peer) QueueMessage(msg *ethwire.Msg) {
+	if atomic.LoadInt32(&p.connected) != 1 {
+		return
+	}
+
 	p.outputQueue <- msg
 }
 
@@ -295,28 +299,6 @@ func (p *Peer) HandleInbound() {
 				var block, lastBlock *ethchain.Block
 				var err error
 
-				// 1. Compare the first block over the wire's prev-hash with the hash of your last block
-				// 2. If these two values are the same you can just link the chains together.
-				// [1:0,2:1,3:2] <- Current blocks (format block:previous_block)
-				// [1:0,2:1,3:2,4:3,5:4] <- incoming blocks
-				// == [1,2,3,4,5]
-				// 3. If the values are not the same we will have to go back and calculate the chain with the highest total difficulty
-				// [1:0,2:1,3:2,11:3,12:11,13:12]
-				// [1:0,2:1,3:2,4:3,5:4,6:5]
-
-				// [3:2,11:3,12:11,13:12]
-				// [3:2,4:3,5:4,6:5]
-				// Heb ik dit blok?
-				// Nee: heb ik een blok met PrevHash 3?
-				// Ja: DIVERSION
-				// Nee; Adding to chain
-
-				// See if we can find a common ancestor
-				// 1. Get the earliest block in the package.
-				// 2. Do we have this block?
-				//    3. Yes: Let's continue what we are doing
-				//    4. No: Let's request more blocks back.
-
 				// Make sure we are actually receiving anything
 				if msg.Data.Len()-1 > 1 && p.catchingUp {
 					// We requested blocks and now we need to make sure we have a common ancestor somewhere in these blocks so we can find
@@ -338,7 +320,6 @@ func (p *Peer) HandleInbound() {
 						if !p.ethereum.StateManager().BlockChain().HasBlock(block.Hash()) {
 							// We don't have this block, but we do have a block with the same prevHash, diversion time!
 							if p.ethereum.StateManager().BlockChain().HasBlockWithPrevHash(block.PrevHash) {
-								//ethutil.Config.Log.Infof("[PEER] Local and foreign chain have diverted after %x, finding best chain!\n", block.PrevHash)
 								if p.ethereum.StateManager().BlockChain().FindCanonicalChainFromMsg(msg, block.PrevHash) {
 									return
 								}
@@ -371,7 +352,8 @@ func (p *Peer) HandleInbound() {
 						p.catchingUp = false
 						p.CatchupWithPeer(p.ethereum.BlockChain().CurrentBlock.Hash())
 					} else if ethchain.IsValidationErr(err) {
-						// TODO
+						fmt.Println(err)
+						p.catchingUp = false
 					}
 				} else {
 					// XXX Do we want to catch up if there were errors?
@@ -381,10 +363,19 @@ func (p *Peer) HandleInbound() {
 							blockInfo := lastBlock.BlockInfo()
 							ethutil.Config.Log.Infof("Synced to block height #%d %x %x\n", blockInfo.Number, lastBlock.Hash(), blockInfo.Hash)
 						}
+
 						p.catchingUp = false
-						p.CatchupWithPeer(p.ethereum.BlockChain().CurrentBlock.Hash())
+
+						hash := p.ethereum.BlockChain().CurrentBlock.Hash()
+						p.CatchupWithPeer(hash)
 					}
 				}
+
+				if msg.Data.Len() == 0 {
+					// Set catching up to false if
+					// the peer has nothing left to give
+					p.catchingUp = false
+				}
 			case ethwire.MsgTxTy:
 				// If the message was a transaction queue the transaction
 				// in the TxPool where it will undergo validation and
@@ -447,7 +438,10 @@ func (p *Peer) HandleInbound() {
 					if len(chain) > 0 {
 						ethutil.Config.Log.Debugf("[PEER] Returning %d blocks: %x ", len(chain), parent.Hash())
 						p.QueueMessage(ethwire.NewMessage(ethwire.MsgBlockTy, chain))
+					} else {
+						p.QueueMessage(ethwire.NewMessage(ethwire.MsgBlockTy, []interface{}{}))
 					}
+
 				} else {
 					ethutil.Config.Log.Debugf("[PEER] Could not find a similar block")
 					// If no blocks are found we send back a reply with msg not in chain
@@ -577,8 +571,8 @@ func (p *Peer) handleHandshake(msg *ethwire.Msg) {
 		p.port = uint16(c.Get(4).Uint())
 
 		// Self connect detection
-		key := ethutil.Config.Db.GetKeys()[0]
-		if bytes.Compare(key.PublicKey, p.pubkey) == 0 {
+		keyPair := ethutil.GetKeyRing().Get(0)
+		if bytes.Compare(keyPair.PublicKey, p.pubkey) == 0 {
 			p.Stop()
 
 			return