{
  "manageEntity": {
    "action": "Save",
    "entityId": "954394399",
    "entityType": "Track",
    "nonce": "0x4bd540ac5a1793b5e60e339a1c72a157f54d04f467aecabc94a1a63d86006854",
    "signature": "0xde3a3f7c5eacc81878fbddab5ff0424832c6268baaa0792a07b37c7bb588b04349a174aaaad9ad385af170c9eec2df08a314950d5b7e28ff6af45f2424e28c8c1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}