{
  "manageEntity": {
    "action": "Save",
    "entityId": "1577697704",
    "entityType": "Track",
    "nonce": "0x84b9fcc79d6a639f523e5611c96a100cb1908d24a0752b8eb0de9643a44e36de",
    "signature": "0x4c2edd5ef20ad9dddf14aaa58e993a5f2fb994f736ceef49d49237fa3d53796b2a1eb53c04189620e2960ab99663991d0e60c386a9dcec110e419503a9dc15251c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}