It is proven! I am vgk on Keybase: https://keybase.io/vgk/sigchain#525af22634fb361e80f613fe6abd9c31a499ee89d6ea77eb03ea105692d522cd0f
@firstname.lastname@example.org do take a look at https://writefreely.org/. That might be exactly what you are looking for.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko