The German ID card has that functionality. Date of birth is saved on the chip card and you can identify yourself via NFC reader and the open source ID app. You can see what information is transmitted before sending it. In the case of age verification, it would only be “underage yes/no”.
It’s not perfect but pretty good from a privacy standpoint.
The German ID card has that functionality. Date of birth is saved on the chip card and you can identify yourself via NFC reader and the open source ID app. You can see what information is transmitted before sending it. In the case of age verification, it would only be “underage yes/no”. It’s not perfect but pretty good from a privacy standpoint.