AltCode, 3 months ago

@julian If you need ideas, you can look at what Mastodon, Pleroma, and GoToSocial do:

https://docs-p.joinmastodon.org/admin/config/#federation
https://docs.pleroma.social/backend/configuration/how_to_serve_another_domain_for_webfinger/
https://docs.gotosocial.org/en/latest/getting_started/#domain-name

My Mastodon instance, for example, has the local domain set to vivaldi.net, but the web domain is set to social.vivaldi.net, so my handle looks like @\AltCode@vivaldi.net (or at least it does when viewed from remote servers that respect this configuration).