j"1LAnZuoQdcKCkpDBKQMCgziGMoPC4VQUckMG<div class="post"><div class="quoteheader"><a href="https://bitcointalk.org/index.php?topic=360.msg3434#msg3434">Quote from: DÒataWraith on July 16, 2010, 11:27:46 AM</a></div><div class="quote">Wait, what? I thought reversible computation just uses less energy. Where does the non-determinism come in?<br/></div><br/>It's the theoretical limit of how far you can go with it. When doing a brute force search, you can reverse back to any previous state and try new states.<br/><br/><div class="quoteheader">Quote</div><div class="quote">Anyway, about the hashing being insecure: Wikipedia says that attacks on SHA-256 still take on the order of 2<sup>250</sup> operations. And unless I made a big thinko here, doesn't the hash target change every ~10 minutes? Wouldn't that throw of an attacker? And if it was possible to break SHA faster, wouldn't the system adjust by raising the difficulty level?<br/></div><br/>It's doubtful that SHA2 would be that broken before all coins have been minted. The issue is it then becomes a question of how much it costs to hijack someone's bank account.</div> text/html
https://whatsonchain.com/tx/7c6e5f12fedad3373e8a20cee18cd5b89df3a49a82a0b8c8a667ef222dfd3268