{
  "manageEntity": {
    "action": "Save",
    "entityId": "385163954",
    "entityType": "Track",
    "nonce": "0x0cd05df8d263d8389070d6f3e53d7fd3103286913d71790838aca1ec5ee8a945",
    "signature": "0x1fbfadd5ea4b50fe760b03ce43466079fead961489ecc72a7f1e230d88fc05ad6d232b35bdd90c0883375f89becf75434726e8c63bc8a33b39064c30f621c7431b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}