{
  "manageEntity": {
    "action": "Save",
    "entityId": "599603",
    "entityType": "Track",
    "nonce": "0x62b66eae753db96c2ba681aa3858ba762ede525fc44ce5e97eb92641fbd4c9a0",
    "signature": "0x6490dbd9cf032f68e31149429213aef2bf99809835bcfe28e0df5705755a7fcd0519be5967db45f52f7321496ac72c311b4029cf793172c41668281d72c83db81b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}