{
  "manageEntity": {
    "action": "Save",
    "entityId": "440403064",
    "entityType": "Track",
    "nonce": "0x12b0c1a5f8bfb451134465c35d79965f0d6432c54d2df7d3c44beed37f63c434",
    "signature": "0xf4a0cd4d414cb68f33086863404ec5e5cc0877ac3b79c888e2102b78beec60dc7d0d2a8e2661fa8972e91943ef6d5a466c6f69da83821a87c2b42d1702a5c4d61c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}