diff --git a/pkg/core/transaction/attribute.go b/pkg/core/transaction/attribute.go
index ca4a0ed28..4c4c1d8c3 100644
--- a/pkg/core/transaction/attribute.go
+++ b/pkg/core/transaction/attribute.go
@@ -3,6 +3,7 @@ package transaction
 import (
 	"encoding/hex"
 	"encoding/json"
+	"errors"
 	"fmt"
 
 	"github.com/nspcc-dev/neo-go/pkg/io"
@@ -10,8 +11,14 @@ import (
 
 // Attribute represents a Transaction attribute.
 type Attribute struct {
-	Usage AttrUsage `json:"usage"`
-	Data  []byte    `json:"data"`
+	Usage AttrUsage
+	Data  []byte
+}
+
+// attrJSON is used for JSON I/O of Attribute.
+type attrJSON struct {
+	Usage string `json:"usage"`
+	Data  string `json:"data"`
 }
 
 // DecodeBinary implements Serializable interface.
@@ -72,8 +79,106 @@ func (attr *Attribute) EncodeBinary(bw *io.BinWriter) {
 
 // MarshalJSON implements the json Marshaller interface.
 func (attr *Attribute) MarshalJSON() ([]byte, error) {
-	return json.Marshal(map[string]string{
-		"usage": attr.Usage.String(),
-		"data":  hex.EncodeToString(attr.Data),
+	return json.Marshal(attrJSON{
+		Usage: attr.Usage.String(),
+		Data:  hex.EncodeToString(attr.Data),
 	})
 }
+
+// UnmarshalJSON implements the json.Unmarshaller interface.
+func (attr *Attribute) UnmarshalJSON(data []byte) error {
+	aj := new(attrJSON)
+	err := json.Unmarshal(data, aj)
+	if err != nil {
+		return err
+	}
+	binData, err := hex.DecodeString(aj.Data)
+	if err != nil {
+		return err
+	}
+	switch aj.Usage {
+	case "ContractHash":
+		attr.Usage = ContractHash
+	case "ECDH02":
+		attr.Usage = ECDH02
+	case "ECDH03":
+		attr.Usage = ECDH03
+	case "Script":
+		attr.Usage = Script
+	case "Vote":
+		attr.Usage = Vote
+	case "CertURL":
+		attr.Usage = CertURL
+	case "DescriptionURL":
+		attr.Usage = DescriptionURL
+	case "Description":
+		attr.Usage = Description
+	case "Hash1":
+		attr.Usage = Hash1
+	case "Hash2":
+		attr.Usage = Hash2
+	case "Hash3":
+		attr.Usage = Hash3
+	case "Hash4":
+		attr.Usage = Hash4
+	case "Hash5":
+		attr.Usage = Hash5
+	case "Hash6":
+		attr.Usage = Hash6
+	case "Hash7":
+		attr.Usage = Hash7
+	case "Hash8":
+		attr.Usage = Hash8
+	case "Hash9":
+		attr.Usage = Hash9
+	case "Hash10":
+		attr.Usage = Hash10
+	case "Hash11":
+		attr.Usage = Hash11
+	case "Hash12":
+		attr.Usage = Hash12
+	case "Hash13":
+		attr.Usage = Hash13
+	case "Hash14":
+		attr.Usage = Hash14
+	case "Hash15":
+		attr.Usage = Hash15
+	case "Remark":
+		attr.Usage = Remark
+	case "Remark1":
+		attr.Usage = Remark1
+	case "Remark2":
+		attr.Usage = Remark2
+	case "Remark3":
+		attr.Usage = Remark3
+	case "Remark4":
+		attr.Usage = Remark4
+	case "Remark5":
+		attr.Usage = Remark5
+	case "Remark6":
+		attr.Usage = Remark6
+	case "Remark7":
+		attr.Usage = Remark7
+	case "Remark8":
+		attr.Usage = Remark8
+	case "Remark9":
+		attr.Usage = Remark9
+	case "Remark10":
+		attr.Usage = Remark10
+	case "Remark11":
+		attr.Usage = Remark11
+	case "Remark12":
+		attr.Usage = Remark12
+	case "Remark13":
+		attr.Usage = Remark13
+	case "Remark14":
+		attr.Usage = Remark14
+	case "Remark15":
+		attr.Usage = Remark15
+	default:
+		return errors.New("wrong Usage")
+
+	}
+	attr.Data = binData
+	return nil
+}