{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5d0bf50395f9824a93d68c2827e44c316067c63aba5dd3ce753098a803a1ce7b",
    "signature": "0xcf47c308aaa8e1506dbbcc10125d2917d1e1937742880bf7b7742a71fd42b8d15247b9dd9c73734d4ec8144fa0945d9355216266efc901647b998894c196b8e41c",
    "signer": "0xffA3712a9A0434E06E4FA5DAb369De12709e3F57",
    "userId": "495483465"
  }
}