MitID has been active since 2024: https://www.nordicalcohol.org/post/id-now-required-in-denmar...

https://idura.eu/blog/mitid-vs-age-verification-login

That's not the system I'm talking about: https://ageverification.dev/

> Unlinkability is achieved by design through Zero-Knowledge Proof cryptography see the "Privacy by design" section below.