{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x2b5cde82d2bd002fb02a6bc312d801af16c6103ac724f7185e82dc7f84fd6516",
    "signature": "0x54f66c9da8a9eb35aab78e03d496054e29d55fb313a7849a6e25672e69bbb8d566f48944ba155c3b650faec8e61d902cc2fd16c8171d5cc40af3fc76df4598081c",
    "signer": "0x939D38Db4a8fa2AfbC89b397e2FA7419d724138E",
    "userId": "36494573"
  }
}