{
  "manageEntity": {
    "action": "Save",
    "entityId": "1944633225",
    "entityType": "Track",
    "nonce": "0x4ac2d23026314a6256e8487f952a1835fa138b5a668f18c1529cbcf709197e16",
    "signature": "0x5bd5323c40543dcfdd56ed9541f7a2941dae9992a5fcf922d466824fbcf96a542bce3d64c4722ed719d5b63fb9de52c261354b3d6ea483c2eb8be11770aa1f2a1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}