I’ve gathers my ideas about mentions for twtxt/yarn here: Webmentions vs. custom mentions spec for twtxt/yarn - HedgeDoc
You are welcome to edit and comment in the doc, so our ideas are not fragment into a bunch of treads

Thanks for your feedback @lyse@lyse.isobeef.org. For some reason i missed it until now. For now I have implemented endpoint discovery for #webmentions as a metadata field in the twtxt.txt like this:
# webmention = http://darch.dk/timeline/webmention

@bender@twtxt.net you can over at http://darch.dk/timeline/conv/ba3xbfa or by looking at the raw txt https://lyse.isobeef.org/twtxt.txt
I can’t help it that twtxt.net only have temporary caching ¯_(ツ)_/¯