> Quote from: satoshi on June 14, 2010, 08:39:50 PM > If SHA-256 became completely broken, I think we could come to some agreement about what the honest block chain was before the trouble started, lock that in and continue from there with a new hash function. > > If the hash breakdown came gradually, we could transition to a new hash in an orderly way. The software would be programmed to start using a new hash after a certain block number. Everyone would have to upgrade by that time. The software could save the new hash of all the old blocks to make sure a different block with the same old hash can't be used. Here's an answer to a similar question about how to recover from a major meltdown. https://www.bitcoin.org/smf/index.php?topic=191.msg1585#msg1585
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