{
  "manageEntity": {
    "action": "Save",
    "entityId": "455090875",
    "entityType": "Track",
    "nonce": "0x2d8d6554008781c53d4e158d1b24f0bf3c629c510a64cc1039c229b9c867ef03",
    "signature": "0x4504570052c40774c5a383a10afd186f7314fb1aa17545e782873bc477ab8f2a1a06f24cbf77a12bc7d0c4a4c18bdc877516a543faca2345b9dbaa1d324b36161c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}