{
  "manageEntity": {
    "action": "Save",
    "entityId": "575213223",
    "entityType": "Track",
    "nonce": "0x9e3251ebde2547dbb069419e505c1d6da3affedc843157e4b53299a7178b99dd",
    "signature": "0x657895b7402d66eaa0444df9f7f1926d99851085340a68cd860559743843734a10d4d4e90819e996173e27452e0101af86a673037507b9584bc5a07ff0c89bb31b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}