{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x357bf751c248505b99c9d6789e3200a36862a036965463729f5ebe60ed2a5b74",
    "signature": "0x72683d8ce4c84f71190db188804168ad9018e9361227da237ec3cd7c28edd95e6571d5e0e191e3b48bbab04a843c7a9e7e250f2c9e5acb50c71e0c670404ccff1b",
    "signer": "0x8fdC9D9Bf249ae15204891D0d6E134A6F5224A14",
    "userId": "55849739"
  }
}