diff --git a/lib/src/message.dart b/lib/src/message.dart
index 7cdfc00..99acf5a 100644
--- a/lib/src/message.dart
+++ b/lib/src/message.dart
@@ -19,6 +19,9 @@ class Message {
         message = Event.deserialize(data);
         if (message.kind == 4) message = EncryptedDirectMessage(message);
         break;
+      case "OK":
+        message = Nip20.deserialize(data);
+        break;
       case "REQ":
         message = Request.deserialize(data);
         break;
diff --git a/lib/src/nips/nip_020.dart b/lib/src/nips/nip_020.dart
index cf75f0f..7b51506 100644
--- a/lib/src/nips/nip_020.dart
+++ b/lib/src/nips/nip_020.dart
@@ -1,20 +1,39 @@
 import 'dart:convert';
-import 'package:nostr/nostr.dart';
 
+/// When submitting events to relays, clients currently have no way to know if an event was successfully committed to the database.
+/// This NIP introduces the concept of command results which are like NOTICE's except provide more information about if an event was accepted or rejected.
+///
+/// Event successfully written to the database:
+///
+/// ["OK", "b1a649ebe8b435ec71d3784793f3bbf4b93e64e17568a741aecd4c7ddeafce30", true, ""]
+///
+/// Event successfully written to the database because of a reason:
+///
+/// ["OK", "b1a649ebe8b435ec71d3784793f3bbf4b93e64e17568a741aecd4c7ddeafce30", true, "pow: difficulty 25>=24"]
+///
+/// Event blocked due to ip filter:
+///
+/// ["OK", "b1a649ebe8...", false, "blocked: tor exit nodes not allowed"]
+///
+/// …
 class Nip20 {
-  static OKEvent? getOk(String okPayload) {
-    var ok = Message.deserialize(okPayload);
-    if(ok.type == 'OK'){
-      var object = jsonDecode(ok.message);
-      return OKEvent(object[0], object[1], object[2]);
-    }
-  }
-}
+  late String eventId;
+  late bool status;
+  late String message;
+
+  /// Default constructor
+  Nip20(this.eventId, this.status, this.message);
 
-class OKEvent {
-  String eventId;
-  bool status;
-  String message;
+  /// Serialize to nostr close message
+  /// - ["OK", "event_id", true|false, "message"]
+  String serialize() => jsonEncode(["OK", eventId, status, message]);
 
-  OKEvent(this.eventId, this.status, this.message);
-}
\ No newline at end of file
+  /// Deserialize a nostr close message
+  /// - ["OK", "event_id", true|false, "message"]
+  Nip20.deserialize(input) {
+    assert(input.length == 4);
+    eventId = input[1];
+    status = input[2];
+    message = input[3];
+  }
+}
diff --git a/test/nips/nip_020_test.dart b/test/nips/nip_020_test.dart
index 3588225..a4e643a 100644
--- a/test/nips/nip_020_test.dart
+++ b/test/nips/nip_020_test.dart
@@ -2,13 +2,39 @@ import 'package:nostr/nostr.dart';
 import 'package:test/test.dart';
 
 void main() {
-  group('nip020', () {
-    test('getOk', () {
-      String okPayload =
-          '["OK", "b1a649ebe8b435ec71d3784793f3bbf4b93e64e17568a741aecd4c7ddeafce30", true, ""]';
-      OKEvent? okEvent = Nip20.getOk(okPayload);
-      expect(okEvent!.status, true);
+  group('nip20', () {
+    test('Constructor', () {
+      var eventId =
+          "b1a649ebe8b435ec71d3784793f3bbf4b93e64e17568a741aecd4c7ddeafce30";
+      var status = true;
+      var message = "";
+      var nip20 = Nip20(eventId, status, message);
+      expect(nip20.eventId, eventId);
+      expect(nip20.status, status);
+      expect(nip20.message, message);
     });
 
+    test('serialize', () {
+      var eventId =
+          "b1a649ebe8b435ec71d3784793f3bbf4b93e64e17568a741aecd4c7ddeafce30";
+      var status = true;
+      var message = "";
+      var stringNip20 = '["OK","$eventId",$status,"$message"]';
+      var nip20 = Nip20(eventId, status, message);
+      expect(nip20.serialize(), stringNip20);
+    });
+
+    test('deserialize', () {
+      var jsonNip20 = [
+        "OK",
+        "b1a649ebe8b435ec71d3784793f3bbf4b93e64e17568a741aecd4c7ddeafce30",
+        true,
+        ""
+      ];
+      var nip20 = Nip20.deserialize(jsonNip20);
+      expect(nip20.eventId, jsonNip20[1]);
+      expect(nip20.status, jsonNip20[2]);
+      expect(nip20.message, jsonNip20[3]);
+    });
   });
 }