{
  "manageEntity": {
    "action": "Save",
    "entityId": "644643",
    "entityType": "Track",
    "nonce": "0x2a8d147f8cd8873bfaea839a934c2f37876ca62cb34c2c5af769eed4e9777aee",
    "signature": "0x8ba488735c57fa372ff0eeb043b43a71bd274adcc5de895e9bf2d13549f1f71b2ef58ca54c4f334d1b2e6e02e7579f060a7478892ad05e68b59f4ed3d7c9160c1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}