diff --git a/cmd/commands/query.go b/cmd/commands/query.go
index 05bd4f93ca..e31d625491 100644
--- a/cmd/commands/query.go
+++ b/cmd/commands/query.go
@@ -10,6 +10,7 @@ import (
 	"github.com/spf13/cobra"
 
 	"github.com/tendermint/go-wire"
+	"github.com/tendermint/go-wire/data"
 	"github.com/tendermint/merkleeyes/iavl"
 	"github.com/tendermint/tendermint/rpc/client"
 	tmtypes "github.com/tendermint/tendermint/types"
@@ -101,9 +102,9 @@ func queryCmd(cmd *cobra.Command, args []string) error {
 	height := resp.Height
 
 	out, err := json.Marshal(struct {
-		Value  []byte `json:"value"`
-		Proof  []byte `json:"proof"`
-		Height uint64 `json:"height"`
+		Value  data.Bytes `json:"value"`
+		Proof  data.Bytes `json:"proof"`
+		Height uint64     `json:"height"`
 	}{val, proof, height})
 	if err != nil {
 		return err
@@ -179,8 +180,8 @@ func blockCmd(cmd *cobra.Command, args []string) error {
 }
 
 type BlockHex struct {
-	Header []byte `json:"header"`
-	Commit []byte `json:"commit"`
+	Header data.Bytes `json:"header"`
+	Commit data.Bytes `json:"commit"`
 }
 
 type BlockJSON struct {
diff --git a/cmd/commands/tx.go b/cmd/commands/tx.go
index 81e304c9a9..70bc8e626b 100644
--- a/cmd/commands/tx.go
+++ b/cmd/commands/tx.go
@@ -2,7 +2,6 @@ package commands
 
 import (
 	"encoding/hex"
-	"encoding/json"
 	"fmt"
 	"strings"
 
@@ -142,13 +141,9 @@ func sendTxCmd(cmd *cobra.Command, args []string) error {
 	signBytes := tx.SignBytes(chainIDFlag)
 	tx.Inputs[0].Signature = privKey.Sign(signBytes)
 
-	out, err := json.Marshal(tx)
-	if err != nil {
-		return err
-	}
-
+	out := wire.BinaryBytes(tx)
 	fmt.Println("Signed SendTx:")
-	fmt.Println(string(out))
+	fmt.Printf("%X\n", out)
 
 	// broadcast the transaction to tendermint
 	data, log, err := broadcastTx(tx)
@@ -203,13 +198,9 @@ func AppTx(name string, data []byte) error {
 
 	tx.Input.Signature = privKey.Sign(tx.SignBytes(chainIDFlag))
 
-	out, err := json.Marshal(tx)
-	if err != nil {
-		return err
-	}
-
+	out := wire.BinaryBytes(tx)
 	fmt.Println("Signed AppTx:")
-	fmt.Println(string(out))
+	fmt.Printf("%X\n", out)
 
 	data, log, err := broadcastTx(tx)
 	if err != nil {