Since the recent campaign using proton to impersonate recruiters or high level profiles to get information or spread malware, would be good to have a "Verified" badge.

Both a page on the website to check if an address is verified and a badge next to the email for other proton users, like the "Official" for Proton.

Although I understand proton is also used by people that want anonymity, there are also journalists and other figures (especially since the introduction of the Sentinel program) that would like a more public-facing approach.

Verification could be done without handling IDs by either verifying with other services like LinkedIn etc (via oAuth2) or by manually opening a ticket and providing valid proof of possessions