{
  "manageEntity": {
    "action": "Save",
    "entityId": "1621456576",
    "entityType": "Track",
    "nonce": "0x685d9334822081f51ee9aa19ccdef4a586d2e67da534a9b9f499befb30b89468",
    "signature": "0xffe15d2c93cb236585fd60f8942c2a82997360652bc44091de301f1554a3e28d735f7af8efcf2cf5760bfd54135aab6ec7b602bc35239ed0443f19f3382bb1451b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}