sort *all* GetSignBytes:

- call MustSortJSON before return JSON bytes to guarantee alphabetic
ordering

- moved SortJSON and MustSortJSON to types package to avoid cyclic
package dep

examples/democoin/x/cool/types.go

@@ -58,7 +58,7 @@ func (msg MsgSetTrend) GetSignBytes() []byte {
 	if err != nil {
 		panic(err)
 	}
-	return b
+	return sdk.MustSortJSON(b)
 }
 
 //_______________________________________________________________________
@@ -102,5 +102,5 @@ func (msg MsgQuiz) GetSignBytes() []byte {
 	if err != nil {
 		panic(err)
 	}
-	return b
+	return sdk.MustSortJSON(b)
 }

examples/democoin/x/oracle/types.go

@@ -18,7 +18,7 @@ func (msg Msg) GetSignBytes() []byte {
 	if err != nil {
 		panic(err)
 	}
-	return bz
+	return sdk.MustSortJSON(bz)
 }
 
 // GetSigners implements sdk.Msg

examples/democoin/x/pow/types.go

@@ -76,5 +76,5 @@ func (msg MsgMine) GetSignBytes() []byte {
 	if err != nil {
 		panic(err)
 	}
-	return b
+	return sdk.MustSortJSON(b)
 }

examples/democoin/x/pow/types_test.go

@@ -62,7 +62,7 @@ func TestMsgMineGetSignBytes(t *testing.T) {
 	addr := sdk.Address([]byte("sender"))
 	msg := MsgMine{addr, 1, 1, 1, []byte("abc")}
 	res := msg.GetSignBytes()
-	require.Equal(t, string(res), `{"sender":"73656E646572","difficulty":1,"count":1,"nonce":1,"proof":"YWJj"}`)
+	require.Equal(t, string(res), `{"count":1,"difficulty":1,"nonce":1,"proof":"YWJj","sender":"73656E646572"}`)
 }
 
 func TestMsgMineGetSigners(t *testing.T) {

examples/democoin/x/simplestake/msgs.go

@@ -48,7 +48,7 @@ func (msg MsgBond) GetSignBytes() []byte {
 	if err != nil {
 		panic(err)
 	}
-	return bz
+	return sdk.MustSortJSON(bz)
 }
 
 //_______________________________________________________________