{
  "manageEntity": {
    "action": "Save",
    "entityId": "544581",
    "entityType": "Track",
    "nonce": "0x02a7c5b078d0d8743a119e411c18555535e19655f0565a42b7de3a465e22119c",
    "signature": "0x78b6f1d5d142f986c2714309e1a86f18521d754581b6b4e7ba1e0a766d1b47d410d35e15dd20c582062cd12eedba973a3313da188f89209cc6f11695deaf47291b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}