this post was submitted on 31 Mar 2026
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ATProto is what Bluesky is built on, right? How does it differ from Activity Pub? Are there difficulties with bridging the two protocols?
ATProto is much more difficult to self host instances with.
Correct. ATProto is the protocol used by Bluesky. There is one bridge already
@speedythefirst@lemmy.zip AT Protocol uses relays instead of direct communication - think two devices talking over bluetooth (ActivityPub) vs talking through the router on a same network (AT Protocol).
AT Protocol is better for content distribution, but its relay system is more centralized. ActivityPub is better for decentralization, but contents and to a smaller degree servers need to be found first.
Also there is the Nostrr protocol, but to my knowledge it's dwarfed in comparison to ActivityPub and AT Protocol, is also relay-based, and the only instance that uses it that I know is minds.com, which also uses ActivityPub.
And talking about instances with multiple protocols used, alternative to bridging through Bridgy Fed, Wafrn uses both AT Protocol and ActivityPub natively, and NeoDB (for cross-posting afaik) and Friendica (for normal use) allow connecting to your Bluesky account if you have one.