{
  "manageEntity": {
    "action": "Save",
    "entityId": "721453657",
    "entityType": "Track",
    "nonce": "0x1c426d8692cd3d0069d4e8e8a1bd0a9fb672d39f5f6c9859c9c9ba75ef9cfe34",
    "signature": "0x4690c97619edb497c8098b0cff86187801b9fddc7c1f30bb6728ccfd18d41e236d6f2e3b173210acd5a97e61faebc55d10124c68ab155073a5a98c9dbb58e48e1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}