{
  "manageEntity": {
    "action": "Save",
    "entityId": "528880",
    "entityType": "Track",
    "nonce": "0x04ea747afaadf384b469eb7808118d3eada47238cf5667b69c1c761e905516ed",
    "signature": "0xac2f57541a869b184f44344546a048bb9807e027f2e5b209fdd106c4296950791a03807a4a055183d6dd55d2668f2ece8125573d7ac90e41489fe8ba47c4d9191c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}