I think it should be mostly ad-hoc methods: if you have a website put your keys in a dedicated page and direct people there If you are in an org there can be

I think it should be mostly ad-hoc methods: if you have a website put your keys in a dedicated page and direct people there If you are in an org there can be whatever kind of centralised repo Add the hashes to your email signature and/or profile bios There might be a nice uniform solution using DNS and derived keys like certificate chains? I am not sure but I think it might not be necessary