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Alex beat you to it: #390345
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I missed that, thanks. I guess, we are all Nostr-ians :) Anyways, I posted a link in another’s comment with some puzzles which are not like “lost seed”, “forgotten passphrase”.
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No idea but would love to know, too. I have just found a page with a handful of unsolved problems: https://privatekeys.pw/puzzles
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