The Efforts to Extend ActivityPub
wedistribute.org
ActivityPub has remained the dominant Fediverse protocol over the past few years. In that time, many bright ideas have come on how to improve the spec. Here's where those efforts are today.
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Not just deleted, but yes, or a way to check
How can you verify you don't have something?
Not sure what you mean exactly
It's like saying "prove you don't own a poodle". How do you prove that? I can tell you I don't own a poodle... but how can you be sure?
No need to prove it, that's not my point
You can't be sure if something is deleted, because there is no way to prove you don't have something.
However, if you just want to check if the instance claims to have deleted something, you could probably just perform a GET request for the specific object as defined in the activitypub spec.