{
  "manageEntity": {
    "action": "Save",
    "entityId": "249740541",
    "entityType": "Track",
    "nonce": "0xd3719cb2347a54c579fc9713df91f3afa01494cef55ac6d1a6ef74c71b4ec1ce",
    "signature": "0xafc6a809753dbdee4d89b3d9c8b06ee46d09fb0cc82d04010def3f978b64b7fc0469bef2cb64732e6c6866a3e9cb4415ecf6c06bf8f389f8e74b0d76c89290e51b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}