diff --git a/cmd/ethereum/main.go b/cmd/ethereum/main.go
index 7e67a6dcc..c39f904fb 100644
--- a/cmd/ethereum/main.go
+++ b/cmd/ethereum/main.go
@@ -22,8 +22,8 @@ import (
 	"os"
 	"runtime"
 
-	"github.com/ethereum/go-ethereum/chain/types"
 	"github.com/ethereum/go-ethereum/cmd/utils"
+	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/logger"
 )
diff --git a/core/chain_manager_test.go b/core/chain_manager_test.go
index 51e70fb12..ab43c511d 100644
--- a/core/chain_manager_test.go
+++ b/core/chain_manager_test.go
@@ -6,7 +6,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/ethereum/go-ethereum/chain/types"
+	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/state"
diff --git a/core/helper_test.go b/core/helper_test.go
index 2b1510ea4..b340144fd 100644
--- a/core/helper_test.go
+++ b/core/helper_test.go
@@ -4,7 +4,7 @@ import (
 	"container/list"
 	"fmt"
 
-	"github.com/ethereum/go-ethereum/chain/types"
+	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/ethutil"
diff --git a/tests/helper/vm.go b/tests/helper/vm.go
index 6ee50a5ae..e0d5adb15 100644
--- a/tests/helper/vm.go
+++ b/tests/helper/vm.go
@@ -3,7 +3,7 @@ package helper
 import (
 	"math/big"
 
-	"github.com/ethereum/go-ethereum/chain"
+	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/state"
@@ -66,9 +66,9 @@ func (self *Env) Transfer(from, to vm.Account, amount *big.Int) error {
 	return vm.Transfer(from, to, amount)
 }
 
-func (self *Env) vm(addr, data []byte, gas, price, value *big.Int) *chain.Execution {
+func (self *Env) vm(addr, data []byte, gas, price, value *big.Int) *core.Execution {
 	evm := vm.New(self, vm.DebugVmTy)
-	exec := chain.NewExecution(evm, addr, data, gas, price, value)
+	exec := core.NewExecution(evm, addr, data, gas, price, value)
 	exec.SkipTransfer = self.skipTransfer
 
 	return exec
diff --git a/tests/vm/gh_test.go b/tests/vm/gh_test.go
index 5c4df1975..3da37cd3a 100644
--- a/tests/vm/gh_test.go
+++ b/tests/vm/gh_test.go
@@ -6,7 +6,7 @@ import (
 	"strconv"
 	"testing"
 
-	"github.com/ethereum/go-ethereum/chain/types"
+	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/state"
 	"github.com/ethereum/go-ethereum/tests/helper"
diff --git a/vm/analysis.go b/vm/analysis.go
index 52c7143e0..fef448b7b 100644
--- a/vm/analysis.go
+++ b/vm/analysis.go
@@ -6,17 +6,17 @@ import (
 	"github.com/ethereum/go-ethereum/ethutil"
 )
 
-func analyseJumpDests(code []byte) (dests map[int64]*big.Int) {
-	dests = make(map[int64]*big.Int)
+func analyseJumpDests(code []byte) (dests map[uint64]*big.Int) {
+	dests = make(map[uint64]*big.Int)
 
 	lp := false
 	var lpv *big.Int
-	for pc := int64(0); pc < int64(len(code)); pc++ {
+	for pc := uint64(0); pc < uint64(len(code)); pc++ {
 		var op OpCode = OpCode(code[pc])
 		switch op {
 		case PUSH1, PUSH2, PUSH3, PUSH4, PUSH5, PUSH6, PUSH7, PUSH8, PUSH9, PUSH10, PUSH11, PUSH12, PUSH13, PUSH14, PUSH15, PUSH16, PUSH17, PUSH18, PUSH19, PUSH20, PUSH21, PUSH22, PUSH23, PUSH24, PUSH25, PUSH26, PUSH27, PUSH28, PUSH29, PUSH30, PUSH31, PUSH32:
-			a := int64(op) - int64(PUSH1) + 1
-			if int64(len(code)) > pc+1+a {
+			a := uint64(op) - uint64(PUSH1) + 1
+			if uint64(len(code)) > pc+1+a {
 				lpv = ethutil.BigD(code[pc+1 : pc+1+a])
 			}
 
diff --git a/vm/closure.go b/vm/closure.go
index 5324ee1ec..bd5268f96 100644
--- a/vm/closure.go
+++ b/vm/closure.go
@@ -41,16 +41,16 @@ func NewClosure(msg *state.Message, caller ClosureRef, object ClosureRef, code [
 	return c
 }
 
-func (c *Closure) GetValue(x *big.Int) *ethutil.Value {
-	return c.GetRangeValue(x, big.NewInt(1))
+func (c *Closure) GetValue(x uint64) *ethutil.Value {
+	return c.GetRangeValue(x, 1)
 }
 
-func (c *Closure) GetOp(x int) OpCode {
+func (c *Closure) GetOp(x uint64) OpCode {
 	return OpCode(c.GetByte(x))
 }
 
-func (c *Closure) GetByte(x int) byte {
-	if x > -1 && x < len(c.Code) {
+func (c *Closure) GetByte(x uint64) byte {
+	if x < uint64(len(c.Code)) {
 		return c.Code[x]
 	}
 
@@ -65,12 +65,12 @@ func (c *Closure) GetBytes(x, y int) []byte {
 	return c.Code[x : x+y]
 }
 
-func (c *Closure) GetRangeValue(x, y *big.Int) *ethutil.Value {
-	if x.Int64() >= int64(len(c.Code)) || y.Int64() >= int64(len(c.Code)) {
+func (c *Closure) GetRangeValue(x, y uint64) *ethutil.Value {
+	if x >= uint64(len(c.Code)) || y >= uint64(len(c.Code)) {
 		return ethutil.NewValue(0)
 	}
 
-	partial := c.Code[x.Int64() : x.Int64()+y.Int64()]
+	partial := c.Code[x : x+y]
 
 	return ethutil.NewValue(partial)
 }
diff --git a/vm/vm_debug.go b/vm/vm_debug.go
index cf234c412..712af55fa 100644
--- a/vm/vm_debug.go
+++ b/vm/vm_debug.go
@@ -75,35 +75,35 @@ func (self *DebugVm) Run(me, caller ClosureRef, code []byte, value, gas, price *
 	var (
 		op OpCode
 
-		destinations = analyseJumpDests(closure.Code)
-		mem          = NewMemory()
-		stack        = NewStack()
-		pc           = big.NewInt(0)
-		step         = 0
-		prevStep     = 0
-		statedb      = self.env.State()
-		require      = func(m int) {
+		destinations        = analyseJumpDests(closure.Code)
+		mem                 = NewMemory()
+		stack               = NewStack()
+		pc           uint64 = 0
+		step                = 0
+		prevStep            = 0
+		statedb             = self.env.State()
+		require             = func(m int) {
 			if stack.Len() < m {
 				panic(fmt.Sprintf("%04v (%v) stack err size = %d, required = %d", pc, op, stack.Len(), m))
 			}
 		}
 
-		jump = func(from, to *big.Int) {
-			p := int(to.Int64())
+		jump = func(from uint64, to *big.Int) {
+			p := to.Uint64()
 
 			self.Printf(" ~> %v", to)
 			// Return to start
 			if p == 0 {
-				pc = big.NewInt(0)
+				pc = 0
 			} else {
 				nop := OpCode(closure.GetOp(p))
-				if !(nop == JUMPDEST || destinations[from.Int64()] != nil) {
+				if !(nop == JUMPDEST || destinations[from] != nil) {
 					panic(fmt.Sprintf("JUMP missed JUMPDEST (%v) %v", nop, p))
 				} else if nop == JUMP || nop == JUMPI {
 					panic(fmt.Sprintf("not allowed to JUMP(I) in to JUMP"))
 				}
 
-				pc = to
+				pc = to.Uint64()
 
 			}
 
@@ -125,26 +125,28 @@ func (self *DebugVm) Run(me, caller ClosureRef, code []byte, value, gas, price *
 
 		step++
 		// Get the memory location of pc
-		op = closure.GetOp(int(pc.Uint64()))
+		op = closure.GetOp(pc)
 
-		// XXX Leave this Println intact. Don't change this to the log system.
-		// Used for creating diffs between implementations
-		if self.logTy == LogTyDiff {
-			switch op {
-			case STOP, RETURN, SUICIDE:
-				statedb.GetStateObject(closure.Address()).EachStorage(func(key string, value *ethutil.Value) {
-					value.Decode()
-					fmt.Printf("%x %x\n", new(big.Int).SetBytes([]byte(key)).Bytes(), value.Bytes())
-				})
+		/*
+			// XXX Leave this Println intact. Don't change this to the log system.
+			// Used for creating diffs between implementations
+			if self.logTy == LogTyDiff {
+				switch op {
+				case STOP, RETURN, SUICIDE:
+					statedb.GetStateObject(closure.Address()).EachStorage(func(key string, value *ethutil.Value) {
+						value.Decode()
+						fmt.Printf("%x %x\n", new(big.Int).SetBytes([]byte(key)).Bytes(), value.Bytes())
+					})
+				}
+
+				b := pc.Bytes()
+				if len(b) == 0 {
+					b = []byte{0}
+				}
+
+				fmt.Printf("%x %x %x %x\n", closure.Address(), b, []byte{byte(op)}, closure.Gas.Bytes())
 			}
-
-			b := pc.Bytes()
-			if len(b) == 0 {
-				b = []byte{0}
-			}
-
-			fmt.Printf("%x %x %x %x\n", closure.Address(), b, []byte{byte(op)}, closure.Gas.Bytes())
-		}
+		*/
 
 		gas := new(big.Int)
 		addStepGasUsage := func(amount *big.Int) {
@@ -735,13 +737,15 @@ func (self *DebugVm) Run(me, caller ClosureRef, code []byte, value, gas, price *
 
 			// 0x50 range
 		case PUSH1, PUSH2, PUSH3, PUSH4, PUSH5, PUSH6, PUSH7, PUSH8, PUSH9, PUSH10, PUSH11, PUSH12, PUSH13, PUSH14, PUSH15, PUSH16, PUSH17, PUSH18, PUSH19, PUSH20, PUSH21, PUSH22, PUSH23, PUSH24, PUSH25, PUSH26, PUSH27, PUSH28, PUSH29, PUSH30, PUSH31, PUSH32:
-			a := big.NewInt(int64(op) - int64(PUSH1) + 1)
-			pc.Add(pc, ethutil.Big1)
-			data := closure.GetRangeValue(pc, a)
+			//a := big.NewInt(int64(op) - int64(PUSH1) + 1)
+			a := uint64(op - PUSH1 + 1)
+			//pc.Add(pc, ethutil.Big1)
+			data := closure.GetRangeValue(pc+1, a)
 			val := ethutil.BigD(data.Bytes())
 			// Push value to stack
 			stack.Push(val)
-			pc.Add(pc, a.Sub(a, big.NewInt(1)))
+			pc += a
+			//pc.Add(pc, a.Sub(a, big.NewInt(1)))
 
 			step += int(op) - int(PUSH1) + 1
 
@@ -750,13 +754,9 @@ func (self *DebugVm) Run(me, caller ClosureRef, code []byte, value, gas, price *
 			stack.Pop()
 		case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16:
 			n := int(op - DUP1 + 1)
-			v := stack.Dupn(n)
+			stack.Dupn(n)
 
 			self.Printf(" => [%d] 0x%x", n, stack.Peek().Bytes())
-
-			if OpCode(closure.GetValue(new(big.Int).Add(pc, ethutil.Big1)).Uint()) == POP && OpCode(closure.GetValue(new(big.Int).Add(pc, big.NewInt(2))).Uint()) == POP {
-				fmt.Println(toValue(v))
-			}
 		case SWAP1, SWAP2, SWAP3, SWAP4, SWAP5, SWAP6, SWAP7, SWAP8, SWAP9, SWAP10, SWAP11, SWAP12, SWAP13, SWAP14, SWAP15, SWAP16:
 			n := int(op - SWAP1 + 2)
 			x, y := stack.Swapn(n)
@@ -811,7 +811,6 @@ func (self *DebugVm) Run(me, caller ClosureRef, code []byte, value, gas, price *
 
 			self.Printf(" {0x%x : 0x%x}", loc.Bytes(), val.Bytes())
 		case JUMP:
-
 			jump(pc, stack.Pop())
 
 			continue
@@ -826,7 +825,7 @@ func (self *DebugVm) Run(me, caller ClosureRef, code []byte, value, gas, price *
 
 		case JUMPDEST:
 		case PC:
-			stack.Push(pc)
+			stack.Push(big.NewInt(int64(pc)))
 		case MSIZE:
 			stack.Push(big.NewInt(int64(mem.Len())))
 		case GAS:
@@ -940,13 +939,13 @@ func (self *DebugVm) Run(me, caller ClosureRef, code []byte, value, gas, price *
 			return closure.Return(nil), fmt.Errorf("Invalid opcode %x", op)
 		}
 
-		pc.Add(pc, ethutil.Big1)
+		pc++
 
 		self.Endl()
 
 		if self.Dbg != nil {
 			for _, instrNo := range self.Dbg.BreakPoints() {
-				if pc.Cmp(big.NewInt(instrNo)) == 0 {
+				if pc == uint64(instrNo) {
 					self.Stepping = true
 
 					if !self.Dbg.BreakHook(prevStep, op, mem, stack, statedb.GetStateObject(closure.Address())) {
diff --git a/xeth/pipe.go b/xeth/pipe.go
index cabcc1cbe..f1ecd19d5 100644
--- a/xeth/pipe.go
+++ b/xeth/pipe.go
@@ -39,6 +39,9 @@ func New(obj core.EthManager) *XEth {
 	return pipe
 }
 
+/*
+ * State / Account accessors
+ */
 func (self *XEth) Balance(addr []byte) *ethutil.Value {
 	return ethutil.NewValue(self.World().safeGet(addr).Balance)
 }
@@ -47,6 +50,31 @@ func (self *XEth) Nonce(addr []byte) uint64 {
 	return self.World().safeGet(addr).Nonce
 }
 
+func (self *XEth) Block(hash []byte) *types.Block {
+	return self.blockChain.GetBlock(hash)
+}
+
+func (self *XEth) Storage(addr, storageAddr []byte) *ethutil.Value {
+	return self.World().safeGet(addr).GetStorage(ethutil.BigD(storageAddr))
+}
+
+func (self *XEth) Exists(addr []byte) bool {
+	return self.World().Get(addr) != nil
+}
+
+// Converts the given private key to an address
+func (self *XEth) ToAddress(priv []byte) []byte {
+	pair, err := crypto.NewKeyPairFromSec(priv)
+	if err != nil {
+		return nil
+	}
+
+	return pair.Address()
+}
+
+/*
+ * Execution helpers
+ */
 func (self *XEth) Execute(addr []byte, data []byte, value, gas, price *ethutil.Value) ([]byte, error) {
 	return self.ExecuteObject(&Object{self.World().safeGet(addr)}, data, value, gas, price)
 }
@@ -61,39 +89,11 @@ func (self *XEth) ExecuteObject(object *Object, data []byte, value, gas, price *
 
 	vmenv := NewEnv(self.Vm.State, block, value.BigInt(), initiator.Address())
 	return vmenv.Call(initiator, object.Address(), data, gas.BigInt(), price.BigInt(), value.BigInt())
-	/*
-		evm := vm.New(, vm.Type(ethutil.Config.VmType))
-
-		msg := vm.NewExecution(evm, object.Address(), data, gas.BigInt(), price.BigInt(), value.BigInt())
-		ret, err := msg.Exec(object.Address(), initiator)
-
-		fmt.Println("returned from call", ret, err)
-
-		return ret, err
-	*/
-}
-
-func (self *XEth) Block(hash []byte) *types.Block {
-	return self.blockChain.GetBlock(hash)
-}
-
-func (self *XEth) Storage(addr, storageAddr []byte) *ethutil.Value {
-	return self.World().safeGet(addr).GetStorage(ethutil.BigD(storageAddr))
-}
-
-func (self *XEth) ToAddress(priv []byte) []byte {
-	pair, err := crypto.NewKeyPairFromSec(priv)
-	if err != nil {
-		return nil
-	}
-
-	return pair.Address()
-}
-
-func (self *XEth) Exists(addr []byte) bool {
-	return self.World().Get(addr) != nil
 }
 
+/*
+ * Transactional methods
+ */
 func (self *XEth) TransactString(key *crypto.KeyPair, rec string, value, gas, price *ethutil.Value, data []byte) (*types.Transaction, error) {
 	// Check if an address is stored by this address
 	var hash []byte
@@ -149,13 +149,6 @@ func (self *XEth) Transact(key *crypto.KeyPair, to []byte, value, gas, price *et
 	}
 
 	return tx, nil
-
-	//acc := self.blockManager.TransState().GetOrNewStateObject(key.Address())
-	//self.obj.TxPool().QueueTransaction(tx)
-
-	//acc.Nonce += 1
-	//self.blockManager.TransState().UpdateStateObject(acc)
-
 }
 
 func (self *XEth) PushTx(tx *types.Transaction) ([]byte, error) {