{
  "manageEntity": {
    "action": "Save",
    "entityId": "475448",
    "entityType": "Track",
    "nonce": "0x6c2d4fb67062e7cf9fa604a1a4682853f6f6b0710c6a4603ad4c8e8631dab7e4",
    "signature": "0x4a04b75b86dfb87acbe757ef912facbcdb891c4d92bd2397d07f64d04b0c5255291a0fa552dad4564bddf669d8011f16fb0b29a44ba5bc3f313cedf22a8c6f461b",
    "signer": "0x71114Ff581aA73d1F4b6429D7713914f10e8e90B",
    "userId": "894513731"
  }
}