{
  "manageEntity": {
    "action": "Save",
    "entityId": "1339425750",
    "entityType": "Track",
    "nonce": "0x8f74b586fedaf7aa9a0eaf1b675f48e616fc0caa7ff5be96ffadfe17178a8980",
    "signature": "0xb22de743c19f1e0bc5c6646454791a124d2676c061a0dd308385211e0ccbaa751c50dace5c57812278005ce18b22274d5aeeea5593a43d032d0716887c6909b41c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}