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@thisismissem Truth, the only notion that the core protocol has of "instances" is in origin checking of received messages

(basically: don't trust a message authenticated as https://example.com/@user to contain valid contents for any posts outside of scope of https://example.com/)

(n.b.2. this is also why you can't take "your" keys with you; having per-user keys is also a lie, and kinda pointless, and we could probably simplify the protocol if we didn't have them)