Fixes #121

state/tx_cache.go

@@ -174,7 +174,7 @@ func toStateAccount(acc *vm.Account) *acm.Account {
 	if acc.StorageRoot.IsZero() {
 		storageRoot = nil
 	} else {
-		storageRoot = acc.StorageRoot.Bytes()
+		storageRoot = acc.StorageRoot.Postfix(20)
 	}
 	return &acm.Account{
 		Address:     acc.Address.Postfix(20),

state/tx_cache_test.go

@@ -0,0 +1,24 @@
+package state
+
+import (
+	"bytes"
+	"testing"
+
+	. "github.com/tendermint/tendermint/common"
+	"github.com/tendermint/tendermint/wire"
+)
+
+func TestStateToFromVMAccount(t *testing.T) {
+	acmAcc1, _ := RandAccount(true, 456)
+	acmAcc1.StorageRoot = RandBytes(20)
+	vmAcc := toVMAccount(acmAcc1)
+	acmAcc2 := toStateAccount(vmAcc)
+
+	acmAcc1Bytes := wire.BinaryBytes(acmAcc1)
+	acmAcc2Bytes := wire.BinaryBytes(acmAcc2)
+	if !bytes.Equal(acmAcc1Bytes, acmAcc2Bytes) {
+		t.Errorf("Unexpected account wire bytes\n%X vs\n%X",
+			acmAcc1Bytes, acmAcc2Bytes)
+	}
+
+}