{
  "manageEntity": {
    "action": "Save",
    "entityId": "1837383609",
    "entityType": "Track",
    "nonce": "0x5911c7440fa66d5187425db67a94c5a2c5728e1298bc636281e21f07b1cb3c5c",
    "signature": "0x0d57768dd3dcadbe279aced30d6268a4d94c1c99f4b00e753cf6bb2add54133e05a6f3b040cc1b1e3cf732abea490e28eeeacfcf354562e39fa1fabd7d2e94f71b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}