{
  "manageEntity": {
    "action": "Save",
    "entityId": "1687442840",
    "entityType": "Track",
    "nonce": "0x0462b3a8fa03518fb309500cb7f2cb0e3833974d5cac94a9f48879c4901db436",
    "signature": "0x258c7670d668c6ce1f12631ac717e8721accd18cac0c91d5ccf0c021353be30e542db1d9c6b9451cbfcaffba948e21e3bee3b7b9c91aad46baa8b75998461af91b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}