Series V · Card 20 of 21 · THE MINE
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.
SATOSHI NAKAMOTO · BITCOINTALK · 14.06.2010
Turn it over, answer, sign – free, no account.
Source
BitcoinTalk, “Re: Dealing with SHA-256 Collisions”, 14 June 2010
About the author
Pseudonymous creator of Bitcoin. Published the whitepaper “Bitcoin: A Peer-to-Peer Electronic Cash System” in 2008 and launched the network in 2009. Their identity remains unknown.
About the source
Bitcointalk: the forum Satoshi opened in November 2009 to talk about Bitcoin.
The question on the back
When something fundamental breaks, how fast do you find a fresh start?