{
  "manageEntity": {
    "action": "Save",
    "entityId": "857899157",
    "entityType": "Track",
    "nonce": "0xeadc58e4313bdeb1aa711b2b527ccec5f42ccb74ccb2fafffe8d55f418fae3d2",
    "signature": "0xca09f58325fb2c738769adb8261b392bba66e8bd7c4887d7dba465b06c532a9c1d61eacdab4181e69fa30ad555802eb972cce71f80b610217bffeeb1a0063d3d1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}