It's like the 10th time I see something like this. So fuck it

QUATUM COMPUTERS DON'T BREAK HASH FUNCTIONS. IT WOULDTAKEE IMPOSSIBLY DEEP CIRCUITS. THEY BREAK THE ECDLP, AND THIS **IS** A REAL THREAT.

I don't believe sha256 will be broken (in cryptography terms) in the next decades. I agree with satoshi that it is not merelyan small improvement over sha1 or MD*. It's probably as best as a Merkle–Damgård can get you. BUT THIS IS NOT RELEVANT HERE