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91 boosts and still going strong. Federation works, everyone!
this post was submitted on 26 Nov 2023
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GUIDs are globally unique because of maths and clocks not because of checking. When you generate a GUID you can be confident no GUID the same has ever been generated using that algorithm, ever, anywhere, and you don't have to check.
However, someone pointed out you could run a malicious instance that copies GUIDs from other instances and federates them out to deliberately cause issues, so this idea is out.
Ah fair, I guess I misunderstood GUID's.