If the server can trust the device, then you don't need the parent, you can use a digital-enabled id card or passport. This is in fact the EU age verification

If the server can trust the device, then you don't need the parent, you can use a digital-enabled id card or passport. This is in fact the EU age verification app https://commission.europa.eu/news-and-media/news/european-age-verification-app-keep-children-safe-online-2026-04-15_en https://commission.europa.eu/news-and-media/news/european-ag... The concern here is the trust in the device appears to be tied to proprietary os/device vendors.