Fair enough. I think there are many edge cases like that. Even I wrote software where the expubkey had to be exposed. To be fair, I don’t think that’s a typical use case though. Nevertheless Bitcoin will change one way or another when the time comes, because the privkey -> pubkey not QC safe relationship is not acceptable. I think it’ll be a much needed healthy shakeup for the ecosystem. It’ll lead to a bunch of conflicts like the scaling war, but it’ll be healthy. It’ll be also interesting to see altcoins fail one after another, due to insufficient QC security. I think much (alt)coin stealing will happen around 2030-ish, when quantum computers those can break Shor will be somewhat anonymously accessible.

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