回复：重大崩溃
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这里有一个对类似问题的回答，讲的是如何从重大崩溃中恢复。 https://www.bitcoin.org/smf/index.php?topic=191.msg1585#msg1585
引用 satoshi 于 2010 年 6 月 14 日 08:39:50 PM 的发言
如果 SHA-256 被彻底攻破，我想我们可以就问题发生前哪条是诚实的区块链达成某种共识，将其锁定，然后从那里开始使用新的哈希函数继续运行。
如果哈希函数是逐渐失效的，我们可以有序地过渡到新的哈希函数。软件会被设定为在某个区块编号之后开始使用新的哈希函数。所有人都必须在那之前升级。软件可以保存所有旧区块的新哈希，以确保无法使用具有相同旧哈希的不同区块。
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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
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.