{
  "manageEntity": {
    "action": "Save",
    "entityId": "519141736",
    "entityType": "Track",
    "nonce": "0x0f2a3f0aac9c14404b3246eb82c3d950c4afdc87cd84369267246884a1387f95",
    "signature": "0xd33e7b8b43a3c4f2a7f68c3d045a42ecbd8c86bc5ec08446331b8a0bfc570cd92e439601d0eab2a7900b95ae5cf4da93ff77f2ff9298a721ce6ba620c2c1aa071b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}