@trwnh @by_caballero since tel: is extremely fraught, especially nowadays with insane phone spam etc, a Signal/WhatsApp/etc address might be a good alternative example?

I particularly like the "established encrypted messenger" example because the wf->[rel=messenger]-> lookup could get Fedi encrypted DMs "for free."

(obviously lots I'm glossing over that make it more complicated, but in theory it'd be less complicated than many alternatives)