{
  "manageEntity": {
    "action": "Save",
    "entityId": "464183707",
    "entityType": "Track",
    "nonce": "1793004711749835129",
    "signature": "0x998b42a2292b5c3a9d59d8043325c782820c2fd33454c9db22a22cc35725f5d7250138180f49c9dedaf2833f16460621261353b8c9eca1e6fdc298c8150560d61b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}