diff --git a/cmd/evm/main.go b/cmd/evm/main.go
index 432cbd0014..d6a93460e6 100644
--- a/cmd/evm/main.go
+++ b/cmd/evm/main.go
@@ -65,7 +65,6 @@ func main() {
 	statedb := state.New(nil, db)
 	sender := statedb.NewStateObject([]byte("sender"))
 	receiver := statedb.NewStateObject([]byte("receiver"))
-	//receiver.SetCode([]byte(*code))
 	receiver.SetCode(ethutil.Hex2Bytes(*code))
 
 	vmenv := NewEnv(statedb, []byte("evmuser"), ethutil.Big(*value))
diff --git a/core/execution.go b/core/execution.go
index 5e0cbd37ed..f7d5a89453 100644
--- a/core/execution.go
+++ b/core/execution.go
@@ -61,10 +61,10 @@ func (self *Execution) exec(code, contextAddr []byte, caller vm.ContextRef) (ret
 	snapshot := env.State().Copy()
 	start := time.Now()
 	ret, err = evm.Run(to, caller, code, self.value, self.Gas, self.price, self.input)
+	chainlogger.Debugf("vm took %v\n", time.Since(start))
 	if err != nil {
 		env.State().Set(snapshot)
 	}
-	chainlogger.Debugf("vm took %v\n", time.Since(start))
 
 	return
 }
diff --git a/trie/secure_trie.go b/trie/secure_trie.go
new file mode 100644
index 0000000000..c6ef90351d
--- /dev/null
+++ b/trie/secure_trie.go
@@ -0,0 +1,32 @@
+package trie
+
+import "github.com/ethereum/go-ethereum/crypto"
+
+type SecureTrie struct {
+	*Trie
+}
+
+func NewSecure(root []byte, backend Backend) *SecureTrie {
+	return &SecureTrie{New(root, backend)}
+}
+
+func (self *SecureTrie) Update(key, value []byte) Node {
+	return self.Trie.Update(crypto.Sha3(key), value)
+}
+func (self *SecureTrie) UpdateString(key, value string) Node {
+	return self.Update([]byte(key), []byte(value))
+}
+
+func (self *SecureTrie) Get(key []byte) []byte {
+	return self.Trie.Get(crypto.Sha3(key))
+}
+func (self *SecureTrie) GetString(key string) []byte {
+	return self.Get([]byte(key))
+}
+
+func (self *SecureTrie) Delete(key []byte) Node {
+	return self.Trie.Delete(crypto.Sha3(key))
+}
+func (self *SecureTrie) DeletString(key string) Node {
+	return self.Delete([]byte(key))
+}
diff --git a/trie/trie_test.go b/trie/trie_test.go
index 4b185f3553..4b0243bcf3 100644
--- a/trie/trie_test.go
+++ b/trie/trie_test.go
@@ -274,7 +274,6 @@ func TestLargeData(t *testing.T) {
 		trie.Update(value2.k, value2.v)
 		vals[string(value.k)] = value
 		vals[string(value2.k)] = value2
-		fmt.Println(value, "\n", value2)
 	}
 
 	it := trie.Iterator()