{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xe3d8bb8d8377f8ef1585bf03b4ebde719036736e488b2316de3f3b73cd715053",
    "signature": "0xf3fa987e4359a5d4922b6e1f284ac43f22169ed3347d77b46fa2ec1f7e641c4d61cc6c7c4f6a6fd782d3f280fc39bf1f3dae094a4c3fc34c817635350f505cb71c",
    "signer": "0xE891dF9868dF2b03829B763B0cA1FE8Ac8f72045",
    "userId": "233913819"
  }
}