{
  "manageEntity": {
    "action": "Save",
    "entityId": "670547",
    "entityType": "Track",
    "nonce": "0xd489da386cc1a504bb7dfdfac62099147fd56f4e261315d4fafb042fe7e67771",
    "signature": "0xfa0bfbdf860ffa08c8e3269ea9929d68d0f957384d57afe1a1632d329e89dc2723a84ca1c186f8a33a5713c71112e1960095774f75628c51d365637fb206d3131b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}