{
  "manageEntity": {
    "action": "Save",
    "entityId": "650358338",
    "entityType": "Track",
    "nonce": "0xc74522464d8d1da7d1bdf948516db3b0b884bcba110fc8a64625ddeb82b01b9e",
    "signature": "0xd7d3a92172d4fe8a8519cb7d244f163292f29b0d684b8b266577061e684597d70217a7d36ce9daff5e81e6e47e8987deb174a38a342c8ffce81420a060c0c6071b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}