diff --git a/x/multi-staking/keeper/store.go b/x/multi-staking/keeper/store.go
index 47fd6ce4..df56c5ae 100644
--- a/x/multi-staking/keeper/store.go
+++ b/x/multi-staking/keeper/store.go
@@ -155,7 +155,7 @@ func (k Keeper) BondWeightIterator(ctx sdk.Context, cb func(denom string, bondWe
 
 func (k Keeper) GetMultiStakingUnlock(ctx sdk.Context, multiStakingUnlockID types.UnlockID) (unlock types.MultiStakingUnlock, found bool) {
 	store := ctx.KVStore(k.storeKey)
-	value := store.Get(multiStakingUnlockID.ToBytes())
+	value := store.Get(multiStakingUnlockID.ToByte())
 
 	if value == nil {
 		return unlock, false
@@ -173,11 +173,11 @@ func (k Keeper) SetMultiStakingUnlock(ctx sdk.Context, unlock types.MultiStaking
 
 	bz := k.cdc.MustMarshal(&unlock)
 
-	store.Set(unlock.UnlockID.ToBytes(), bz)
+	store.Set(unlock.UnlockID.ToByte(), bz)
 }
 
 func (k Keeper) DeleteMultiStakingUnlock(ctx sdk.Context, unlockID types.UnlockID) {
 	store := ctx.KVStore(k.storeKey)
 
-	store.Delete(unlockID.ToBytes())
+	store.Delete(unlockID.ToByte())
 }
diff --git a/x/multi-staking/types/key.go b/x/multi-staking/types/key.go
index 3d21ec53..338a50fb 100644
--- a/x/multi-staking/types/key.go
+++ b/x/multi-staking/types/key.go
@@ -1,6 +1,8 @@
 package types
 
 import (
+	"encoding/json"
+
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
@@ -54,24 +56,26 @@ func MultiStakingUnlockID(multiStakerAddr string, valAddr string) UnlockID {
 	return UnlockID{MultiStakerAddr: multiStakerAddr, ValAddr: valAddr}
 }
 
-func DelAddrAndValAddrFromLockID(lockID []byte) (multiStakerAddr sdk.AccAddress, valAddr sdk.ValAddress) {
-	lenMultiStakerAddr := lockID[0]
-
-	multiStakerAddr = lockID[1 : lenMultiStakerAddr+1]
+func DelAddrAndValAddrFromLockID(lockIDByte []byte) (multiStakerAddr sdk.AccAddress, valAddr sdk.ValAddress, err error) {
+	var newLockID LockID
 
-	valAddr = lockID[1+lenMultiStakerAddr:]
+	err = json.Unmarshal(lockIDByte, &newLockID)
+	if err != nil {
+		return nil, nil, err
+	}
 
-	return multiStakerAddr, valAddr
+	return AccAddrAndValAddrFromStrings(newLockID.MultiStakerAddr, newLockID.ValAddr)
 }
 
-func DelAddrAndValAddrFromUnlockID(unlockID []byte) (multiStakerAddr sdk.AccAddress, valAddr sdk.ValAddress) {
-	lenMultiStakerAddr := unlockID[0]
-
-	multiStakerAddr = unlockID[1 : lenMultiStakerAddr+1]
+func DelAddrAndValAddrFromUnlockID(unlockIDByte []byte) (multiStakerAddr sdk.AccAddress, valAddr sdk.ValAddress, err error) {
+	var newUnlockID UnlockID
 
-	valAddr = unlockID[1+lenMultiStakerAddr:]
+	err = json.Unmarshal(unlockIDByte, &newUnlockID)
+	if err != nil {
+		return nil, nil, err
+	}
 
-	return multiStakerAddr, valAddr
+	return AccAddrAndValAddrFromStrings(newUnlockID.MultiStakerAddr, newUnlockID.ValAddr)
 }
 
 // // GetUBDKey creates the key for an unbonding delegation by delegator and validator addr
@@ -81,39 +85,17 @@ func DelAddrAndValAddrFromUnlockID(unlockID []byte) (multiStakerAddr sdk.AccAddr
 // }
 
 func (l LockID) ToByte() []byte {
-	multiStakerAddr, valAcc, err := AccAddrAndValAddrFromStrings(l.MultiStakerAddr, l.ValAddr)
+	bz, err := json.Marshal(l)
 	if err != nil {
-		panic(err)
+		panic("can not Marshal")
 	}
-
-	lenMultiStakerAddr := len(multiStakerAddr)
-
-	DVPair := make([]byte, 1+lenMultiStakerAddr+len(valAcc))
-
-	DVPair[0] = uint8(lenMultiStakerAddr)
-
-	copy(multiStakerAddr[:], DVPair[1:])
-
-	copy(multiStakerAddr[:], DVPair[1+lenMultiStakerAddr:])
-
-	return append(MultiStakingLockPrefix, DVPair...)
+	return bz
 }
 
-func (l UnlockID) ToBytes() []byte {
-	multiStakerAddr, valAcc, err := AccAddrAndValAddrFromStrings(l.MultiStakerAddr, l.ValAddr)
+func (l UnlockID) ToByte() []byte {
+	bz, err := json.Marshal(l)
 	if err != nil {
-		panic(err)
+		panic("can not Marshal")
 	}
-
-	lenMultiStakerAddr := len(multiStakerAddr)
-
-	DVPair := make([]byte, 1+lenMultiStakerAddr+len(valAcc))
-
-	DVPair[0] = uint8(lenMultiStakerAddr)
-
-	copy(multiStakerAddr[:], DVPair[1:])
-
-	copy(multiStakerAddr[:], DVPair[1+lenMultiStakerAddr:])
-
-	return append(MultiStakingLockPrefix, DVPair...)
+	return bz
 }
diff --git a/x/multi-staking/types/key_test.go b/x/multi-staking/types/key_test.go
new file mode 100644
index 00000000..0970eb07
--- /dev/null
+++ b/x/multi-staking/types/key_test.go
@@ -0,0 +1,42 @@
+package types_test
+
+import (
+	"testing"
+
+	"github.com/realio-tech/multi-staking-module/testutil"
+	mulStakingtypes "github.com/realio-tech/multi-staking-module/x/multi-staking/types"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDelAddrAndValAddrFromLockID(t *testing.T) {
+	val := testutil.GenValAddress()
+	del := testutil.GenAddress()
+
+	lockID := mulStakingtypes.MultiStakingLockID(del.String(), val.String())
+
+	toByte := lockID.ToByte()
+
+	rsDel, rsVal, err := mulStakingtypes.DelAddrAndValAddrFromLockID(toByte)
+	require.NoError(t, err)
+	require.Equal(t, del, rsDel)
+	require.Equal(t, val, rsVal)
+}
+
+func TestMultiStakingLockIterator(t *testing.T) {
+	val := testutil.GenValAddress()
+	del1 := testutil.GenAddress()
+	del2 := testutil.GenAddress()
+
+	lockID1 := mulStakingtypes.LockID{
+		MultiStakerAddr: del1.String(),
+		ValAddr:         val.String(),
+	}
+
+	lockID2 := mulStakingtypes.LockID{
+		MultiStakerAddr: del2.String(),
+		ValAddr:         val.String(),
+	}
+
+	require.NotEqual(t, lockID1, lockID2)
+	require.NotEqual(t, lockID1.ToByte(), lockID2.ToByte())
+}