this post was submitted on 17 Nov 2023
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How does ActivityPub differ from what BlueSky is using? (AT) (lemmy.ca)
submitted 11 months ago by otter@lemmy.ca to c/fediverse@lemmy.ml
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I don't quite understand a lot of the details on how the implementations work.

In what ways is AT better or worse than ActivityPub? Are there different versions of ActivityPub? Are there improvements coming to either to make them better (or compatible)?

My current understanding is

  • AT makes it easier to move accounts (according to them), but AT is controlled and maintained by BlueSky, and they are a for-profit company that can mess with the protocol in the future, which goes against the central idea of decentralized social media

What other cool technical details are there?

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[โ€“] poVoq 5 points 11 months ago (1 children)

My current understanding from reading some 3rd party articles is that AT employs a DAG to synchronize messages more consistently.

AP has a different model that has some downsides in regards to consistency, but it should be significantly more resource efficient and have better recovery from failure modes.

[โ€“] iso@lemy.lol 2 points 11 months ago

So in AT, unlike in AP, activity takes place between multiple servers and not only two servers ๐Ÿค”