[snarfed]one obvious solution is to use different bridge domains for each protocol. so for me, my Nostr user would be @snarfed.org@nostr.brid.gy, my Bluesky/ATP would be @snarfed.org@atp.brid.gy, and my web site would be @snarfed.org@web.brid.gy , or something similar
