{
  "manageEntity": {
    "action": "Save",
    "entityId": "393173036",
    "entityType": "Track",
    "nonce": "0xb7b248be4faa585c60e8e671fd0cfa51d7be555a10cab8bb87ae320587a45509",
    "signature": "0xcdf88bb4603a4463d3744b52343664c84556cf06f299050c3217866d9aa371d44c3909b6a8fc220842a5a0edcbeac98a2fb96dd8ada8c75d804d3af08571fa681b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}