@david @bjoreman @HennaVirkkunen At any rate, Mastodon is too short a format to go into the details of issues with ZKPs for age attestation, so some useful pointers:

https://brave.com/blog/zkp-age-verification-limits/

https://www.eff.org/deeplinks/2025/07/zero-knowledge-proofs-alone-are-not-digital-id-solution-protecting-user-privacy