{
  "manageEntity": {
    "action": "Save",
    "entityId": "577718",
    "entityType": "Track",
    "nonce": "0x1c3fca58ee494b55af3f0fa2c178b2472dabf30990f6080a260d6e3653714ae9",
    "signature": "0xc481382d53e90839b1f5a2a439c589cec5d780884caeb358a067193ed3ec03061303f129f26dfb686fd74e2f85968298935992ce6622720290d66fe9ed3736561b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}