{
  "manageEntity": {
    "action": "Save",
    "entityId": "1473371031",
    "entityType": "Track",
    "nonce": "0x9e493a2f133ace24f58c7e694fc8c0cba98a9d18cb0f7b84893ccc981780a477",
    "signature": "0xa2cba5aca6fc3369f70d602d310721b2a1617dc64e1089772b11da11c49fdd3e4dae45022ab1f60b8e8b2639388c164cf55e9753cee7a952cd0f92c132b336a81b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}