{
  "manageEntity": {
    "action": "Save",
    "entityId": "576333158",
    "entityType": "Track",
    "nonce": "0xfc973cb0338c4d68017e999f1355b21b6e3260ab9a555f2e7ad61715dc8450c1",
    "signature": "0xdcd1c392f8e745c7fa4c96073eb7f8ba04225f77ccd764c83d7db4953af0b6cd4bec300a78aac2144698a71b3477ec24708ed1f3488451b7cd082c0d27de02e61b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}