This is widely implemented and used in Germany: https://www.deutschepost.de/en/p/postident.html https://www.deutschepost.de/en/p/postident.html It's a lot easi

This is widely implemented and used in Germany: https://www.deutschepost.de/en/p/postident.html https://www.deutschepost.de/en/p/postident.html It's a lot easier to implement reliably due to the requirement for everyone to have ID cards though (and the ID cards carry your residence address).