{
  "manageEntity": {
    "action": "Save",
    "entityId": "643843",
    "entityType": "Track",
    "nonce": "0xcbd9a97dc9bb447206cc9092e3f0913110aae44c3ea3ff3d41d6f28ae32a9dad",
    "signature": "0x3eccc9b4ab457ebf2e237ef78af97b1e8d97006c957743f6e095bd4a7fb0dffd0ec482384b2831bb585e116ac2648014906677de422242d3cf5d09e9752ea7ce1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}