{
  "manageEntity": {
    "action": "Save",
    "entityId": "209739",
    "entityType": "Track",
    "nonce": "0x7fbf0b7c02ddc0431c328cf923b88b05d1e6bec206c920a491383aaf1b1b65c8",
    "signature": "0xd6838969c89e704627a203bbaf9a493f996f298aed7b2afaefc0f74c84ebfd4531b6d07ea6604fd04eac0d801cc64f65f0a27f8832aa90f1afbdf76abfcefba91c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}