{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa0081bbe9a9de0532322cf08e427fb5d3929424d9557683c23c9bffe8b1aa123",
    "signature": "0xb89df0d907aaf892884ff8413db36f9e97ab53e079a260c6b0d41bdc9294cca167c517365e7fc7402f64f9b28b4973511b548a6166d39a61f3ce8146cbb9a7921c",
    "signer": "0xE056Cc66880683A29B77CF9a0948DB5404aC9891",
    "userId": "743180230"
  }
}