diff --git a/x/bep3/types/msg.go b/x/bep3/types/msg.go
index 15d84fe4..309fa2af 100644
--- a/x/bep3/types/msg.go
+++ b/x/bep3/types/msg.go
@@ -1,7 +1,6 @@
 package types
 
 import (
-	"encoding/json"
 	"fmt"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
@@ -25,24 +24,28 @@ const (
 	MaxExpectedIncomeLength = 64
 )
 
+// ensure Msg interface compliance at compile time
 var (
+	_                      sdk.Msg = &MsgCreateAtomicSwap{}
+	_                      sdk.Msg = &MsgClaimAtomicSwap{}
+	_                      sdk.Msg = &MsgRefundAtomicSwap{}
+	AtomicSwapCoinsAccAddr         = sdk.AccAddress(crypto.AddressHash([]byte("KavaAtomicSwapCoins")))
 	// kava prefix address:  [INSERT BEP3-DEPUTY ADDRESS]
 	// tkava prefix address: [INSERT BEP3-DEPUTY ADDRESS]
-	AtomicSwapCoinsAccAddr = sdk.AccAddress(crypto.AddressHash([]byte("KavaAtomicSwapCoins")))
 )
 
 // MsgCreateAtomicSwap contains an AtomicSwap struct
 type MsgCreateAtomicSwap struct {
-	From                sdk.AccAddress `json:"from"`
-	To                  sdk.AccAddress `json:"to"`
-	RecipientOtherChain string         `json:"recipient_other_chain"`
-	SenderOtherChain    string         `json:"sender_other_chain"`
-	RandomNumberHash    cmn.HexBytes   `json:"random_number_hash"`
-	Timestamp           int64          `json:"timestamp"`
-	Amount              sdk.Coins      `json:"amount"`
-	ExpectedIncome      string         `json:"expected_income"`
-	HeightSpan          int64          `json:"height_span"`
-	CrossChain          bool           `json:"cross_chain"`
+	From                sdk.AccAddress `json:"from"  yaml:"from"`
+	To                  sdk.AccAddress `json:"to"  yaml:"to"`
+	RecipientOtherChain string         `json:"recipient_other_chain"  yaml:"recipient_other_chain"`
+	SenderOtherChain    string         `json:"sender_other_chain"  yaml:"sender_other_chain"`
+	RandomNumberHash    cmn.HexBytes   `json:"random_number_hash"  yaml:"random_number_hash"`
+	Timestamp           int64          `json:"timestamp"  yaml:"timestamp"`
+	Amount              sdk.Coins      `json:"amount"  yaml:"amount"`
+	ExpectedIncome      string         `json:"expected_income"  yaml:"expected_income"`
+	HeightSpan          int64          `json:"height_span"  yaml:"height_span"`
+	CrossChain          bool           `json:"cross_chain"  yaml:"cross_chain"`
 }
 
 // NewMsgCreateAtomicSwap initializes a new MsgCreateAtomicSwap
@@ -137,18 +140,15 @@ func (msg MsgCreateAtomicSwap) ValidateBasic() sdk.Error {
 
 // GetSignBytes gets the sign bytes of a MsgCreateAtomicSwap
 func (msg MsgCreateAtomicSwap) GetSignBytes() []byte {
-	b, err := json.Marshal(msg)
-	if err != nil {
-		panic(err)
-	}
-	return b
+	bz := ModuleCdc.MustMarshalJSON(msg)
+	return sdk.MustSortJSON(bz)
 }
 
 // MsgClaimAtomicSwap defines a AtomicSwap claim
 type MsgClaimAtomicSwap struct {
-	From         sdk.AccAddress `json:"from"`
-	SwapID       cmn.HexBytes   `json:"swap_id"`
-	RandomNumber cmn.HexBytes   `json:"random_number"`
+	From         sdk.AccAddress `json:"from"  yaml:"from"`
+	SwapID       cmn.HexBytes   `json:"swap_id"  yaml:"swap_id"`
+	RandomNumber cmn.HexBytes   `json:"random_number"  yaml:"random_number"`
 }
 
 // NewMsgClaimAtomicSwap initializes a new MsgClaimAtomicSwap
@@ -197,17 +197,14 @@ func (msg MsgClaimAtomicSwap) ValidateBasic() sdk.Error {
 
 // GetSignBytes gets the sign bytes of a MsgClaimAtomicSwap
 func (msg MsgClaimAtomicSwap) GetSignBytes() []byte {
-	b, err := json.Marshal(msg)
-	if err != nil {
-		panic(err)
-	}
-	return b
+	bz := ModuleCdc.MustMarshalJSON(msg)
+	return sdk.MustSortJSON(bz)
 }
 
 // MsgRefundAtomicSwap defines a refund msg
 type MsgRefundAtomicSwap struct {
-	From   sdk.AccAddress `json:"from"`
-	SwapID cmn.HexBytes   `json:"swap_id"`
+	From   sdk.AccAddress `json:"from" yaml:"from"`
+	SwapID cmn.HexBytes   `json:"swap_id" yaml:"swap_id"`
 }
 
 // NewMsgRefundAtomicSwap initializes a new MsgRefundAtomicSwap
@@ -252,9 +249,6 @@ func (msg MsgRefundAtomicSwap) ValidateBasic() sdk.Error {
 
 // GetSignBytes gets the sign bytes of a MsgRefundAtomicSwap
 func (msg MsgRefundAtomicSwap) GetSignBytes() []byte {
-	b, err := json.Marshal(msg)
-	if err != nil {
-		panic(err)
-	}
-	return b
+	bz := ModuleCdc.MustMarshalJSON(msg)
+	return sdk.MustSortJSON(bz)
 }