{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd238003484322105aab06ee64b4b7ab21dde9747604a57b21127ee0068fbed14",
    "signature": "0xb3099d5eb92ef5261281f3e8a48c473787ad75768cf5ae763c1979c0273732fc6d4d7312b8ee17288b5e24ad0637bc508718fe957b7df87b96a947615e4954bb1c",
    "signer": "0xFeA2F48F052cB1BD7DBA7286864B76929A21030F",
    "userId": "444978213"
  }
}