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Douglas_Knight comments on A proposed inefficiency in the Bitcoin markets - Less Wrong
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In particular, the ability to roll back the blockchain breaks the patches you've mentioned for the fact that QC also breaks elliptic curve crypto.
That's true, but there's some precedent for picking a block that everyone agrees upon (that exists before quantum computers) and changing the rules at that block to prevent someone from rewriting the blockchain. A lot depends on how much warning we have.
It looks like making a cryptocoin that can survive quantum computers might be a high value activity.