{
  "manageEntity": {
    "action": "Save",
    "entityId": "463025602",
    "entityType": "Track",
    "nonce": "0x6a0313cf8d31160c95fd3326ca7238611e8a389b55f65373de79cfa59f2a5265",
    "signature": "0x47d72b5fd07ce67ed695c800788e04774e8e2857afcacd1d2c922e55872473234fc09799ad0d1937728e359d034fc1d63f326e5dd45fe36345123203480062241b",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}