{
  "manageEntity": {
    "action": "Save",
    "entityId": "890152791",
    "entityType": "Track",
    "nonce": "0x5a6a816cbc3f5fd1738b2fc0ea708e17bf90078e38922cbfa7126f0a4420885f",
    "signature": "0xccece285c7ac4cb6c84b485d917d0e86fd0d4a4a73b25ec6b624619193ff418215d0f0eea426a1ed3920e6b8c70492f612ea4ca1fe09a055d62d0c48b592f6121c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}