diff --git a/permission/types/snatives.go b/permission/types/snatives.go
index 95c5336bd..b7537477e 100644
--- a/permission/types/snatives.go
+++ b/permission/types/snatives.go
@@ -64,8 +64,8 @@ var _ = binary.RegisterInterface(
 )
 
 type HasBaseArgs struct {
-	Address    []byte
-	Permission PermFlag
+	Address    []byte   `json:"address"`
+	Permission PermFlag `json:"permission"`
 }
 
 func (*HasBaseArgs) PermFlag() PermFlag {
@@ -73,9 +73,9 @@ func (*HasBaseArgs) PermFlag() PermFlag {
 }
 
 type SetBaseArgs struct {
-	Address    []byte
-	Permission PermFlag
-	Value      bool
+	Address    []byte   `json:"address"`
+	Permission PermFlag `json:"permission"`
+	Value      bool     `json:"value"`
 }
 
 func (*SetBaseArgs) PermFlag() PermFlag {
@@ -83,8 +83,8 @@ func (*SetBaseArgs) PermFlag() PermFlag {
 }
 
 type UnsetBaseArgs struct {
-	Address    []byte
-	Permission PermFlag
+	Address    []byte   `json:"address"`
+	Permission PermFlag `json:"permission"`
 }
 
 func (*UnsetBaseArgs) PermFlag() PermFlag {
@@ -92,8 +92,8 @@ func (*UnsetBaseArgs) PermFlag() PermFlag {
 }
 
 type SetGlobalArgs struct {
-	Permission PermFlag
-	Value      bool
+	Permission PermFlag `json:"permission"`
+	Value      bool     `json:"value"`
 }
 
 func (*SetGlobalArgs) PermFlag() PermFlag {
@@ -101,8 +101,8 @@ func (*SetGlobalArgs) PermFlag() PermFlag {
 }
 
 type HasRoleArgs struct {
-	Address []byte
-	Role    string
+	Address []byte `json:"address"`
+	Role    string `json:"role"`
 }
 
 func (*HasRoleArgs) PermFlag() PermFlag {
@@ -110,8 +110,8 @@ func (*HasRoleArgs) PermFlag() PermFlag {
 }
 
 type AddRoleArgs struct {
-	Address []byte
-	Role    string
+	Address []byte `json:"address"`
+	Role    string `json:"role"`
 }
 
 func (*AddRoleArgs) PermFlag() PermFlag {
@@ -119,8 +119,8 @@ func (*AddRoleArgs) PermFlag() PermFlag {
 }
 
 type RmRoleArgs struct {
-	Address []byte
-	Role    string
+	Address []byte `json:"address"`
+	Role    string `json:"role"`
 }
 
 func (*RmRoleArgs) PermFlag() PermFlag {
diff --git a/types/tx.go b/types/tx.go
index 76d80b646..db489c219 100644
--- a/types/tx.go
+++ b/types/tx.go
@@ -328,13 +328,13 @@ type SNativeTx struct {
 	SNative ptypes.SNativeArgs `json:"snative"`
 }
 
-// TODO: check the tx.SNative encoding ...
 func (tx *SNativeTx) WriteSignBytes(chainID string, w io.Writer, n *int64, err *error) {
 	binary.WriteTo([]byte(Fmt(`{"chain_id":%s`, jsonEscape(chainID))), w, n, err)
-	binary.WriteTo([]byte(Fmt(`,"tx":[%v,{"args":%v`, TxTypeSNative, tx.SNative)), w, n, err)
-	binary.WriteTo([]byte(`,"input":`), w, n, err)
+	binary.WriteTo([]byte(Fmt(`,"tx":[%v,{"args":"`, TxTypeSNative)), w, n, err)
+	binary.WriteJSON(tx.SNative, w, n, err)
+	binary.WriteTo([]byte(`","input":`), w, n, err)
 	tx.Input.WriteSignBytes(w, n, err)
-	binary.WriteTo([]byte(Fmt(`,"snative":%s`, tx.SNative)), w, n, err)
+	binary.WriteTo([]byte(Fmt(`,"snative":%s`, jsonEscape(ptypes.PermFlagToString(tx.SNative.PermFlag())))), w, n, err)
 	binary.WriteTo([]byte(`}]}`), w, n, err)
 }
 
diff --git a/types/tx_test.go b/types/tx_test.go
index 8966b2efd..62e4b33d5 100644
--- a/types/tx_test.go
+++ b/types/tx_test.go
@@ -6,6 +6,7 @@ import (
 	acm "github.com/tendermint/tendermint/account"
 	. "github.com/tendermint/tendermint/common"
 	_ "github.com/tendermint/tendermint/config/tendermint_test"
+	ptypes "github.com/tendermint/tendermint/permission/types"
 )
 
 var chainID string
@@ -69,6 +70,26 @@ func TestCallTxSignable(t *testing.T) {
 	}
 }
 
+func TestNameTxSignable(t *testing.T) {
+	nameTx := &NameTx{
+		Input: &TxInput{
+			Address:  []byte("input1"),
+			Amount:   12345,
+			Sequence: 250,
+		},
+		Name: "google.com",
+		Data: "secretly.not.google.com",
+		Fee:  1000,
+	}
+	signBytes := acm.SignBytes(chainID, nameTx)
+	signStr := string(signBytes)
+	expected := Fmt(`{"chain_id":"%s","tx":[3,{"data":"secretly.not.google.com","fee":1000,"input":{"address":"696E70757431","amount":12345,"sequence":250},"name":"google.com"}]}`,
+		config.GetString("chain_id"))
+	if signStr != expected {
+		t.Errorf("Got unexpected sign string for CallTx. Expected:\n%v\nGot:\n%v", expected, signStr)
+	}
+}
+
 func TestBondTxSignable(t *testing.T) {
 	privKeyBytes := make([]byte, 64)
 	var privKeyArray [64]byte
@@ -135,3 +156,25 @@ func TestRebondTxSignable(t *testing.T) {
 		t.Errorf("Got unexpected sign string for RebondTx")
 	}
 }
+
+func TestSNativeTxSignable(t *testing.T) {
+	snativeTx := &SNativeTx{
+		Input: &TxInput{
+			Address:  []byte("input1"),
+			Amount:   12345,
+			Sequence: 250,
+		},
+		SNative: &ptypes.SetBaseArgs{
+			Address:    []byte("address1"),
+			Permission: 1,
+			Value:      true,
+		},
+	}
+	signBytes := acm.SignBytes(chainID, snativeTx)
+	signStr := string(signBytes)
+	expected := Fmt(`{"chain_id":"%s","tx":[32,{"args":"[2,{"address":"6164647265737331","permission":1,"value":true}]","input":{"address":"696E70757431","amount":12345,"sequence":250},"snative":"SetBase"}]}`,
+		config.GetString("chain_id"))
+	if signStr != expected {
+		t.Errorf("Got unexpected sign string for CallTx. Expected:\n%v\nGot:\n%v", expected, signStr)
+	}
+}