I think I understand your position now. And that would certainly be effective at eliminating false credentials claims. However, it also would eliminate a great many true credentials claims, and the underlying premise of the proposal is that true claims are beneficial. You may disagree with that premise, but that's a different discussion. I would like to find a way to verify pseudonymous claims, while still generally preserving privacy. I do think that's possible within reason, although probably not in an absolutely fraud-proof way. As you point out in your opening contribution, the verifiers must be trusted since not just anyone could recheck (otherwise it wouldn't be preserve privacy). That's the main design challenge remaining, in my view. Derex