{
  "manageEntity": {
    "action": "Save",
    "entityId": "752974",
    "entityType": "Track",
    "nonce": "0xa754c87d058dddca5b2e8d6e3286768e12909fd304c3ec69b1787748e5696d3a",
    "signature": "0xae7271571891f7542c26914a9d8124dc58f11d872b7a192b8b83532d2b1370271ab83cb8288103cc4c2888b735abb3066d68f7e94168eeb39d6fb93a6ed902831b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}