{
  "manageEntity": {
    "action": "Save",
    "entityId": "520251953",
    "entityType": "Track",
    "nonce": "0xd90a0f38a7eb0273380bd340db496ce8d154082911763df145aa281a33ec00bc",
    "signature": "0x755d719972c97c82b8f962bb108dea123429ffc7e18a15c14ea55c85588780e72bf79fb3accec7723ff015170b8958f4c65a344e335fefc9306f5c540e99ea4f1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}