{
  "manageEntity": {
    "action": "Save",
    "entityId": "685262017",
    "entityType": "Track",
    "nonce": "0xfb99adbe706b1eb1c7a9067bbd66cbc916957acedb48c48a63ec53c8f4ae3348",
    "signature": "0xeac3d4ae424bfc7bfc3be8c62e22e5e64dc2c8c632baf150c2111ec50b5e3d3e3a8cf50d33da2e6dff74631db3cc589caa694843f4f1d13b4de4c0b8726b06141b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}