An interesting thing about microblogpub is that, very unlike other Fediverse software (like Mastodon), I get a notification when somebody has unfollowed me, or blocked me.
Someone accidentally blocked me, and then immediately unblocked me a couple days ago. I got notifications for both of them.
I didn't actually know that it was a standard part of the ActivityPub protocol for an actor to send a block event to the actor being blocked. It doesn't seem like someone should know that I've blocked them, but I guess that's the way it goes.
Just FYI, in case you didn't know (I certainly didn't), someone might know if you've blocked or unfollowed them.