

If you mean citizenship as being associated to the city whose hosting services you are using, yhe power or water bill pointed at your name and residence should be able to do that. Now, if you want that plus anonimity, the only practical option I can think of for a city-wide physical campaign is some sort of GPG Signature Meetup (“signature party”).
Wouldn’t a zero-knowledge hosting solution (you provide hosting, but you can’t see what’s into it past a stream of binary) help with that?