On Tuesday, June 03, 2014 4:29:55 AM xor wrote:
> Hi,
> I thought a lot about the worst case scenario of SHA256d being broken in a
> way which could be abused to
> A) reduce the work of mining a block by some significant amount
> B) reduce the work of mining a block to zero, i.e. allow instant mining.

C) fabricate past blocks entirely.

If SHA256d is broken, Bitcoin as it is fails entirely.


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