The quoted StackOverflow post is gold:<p>"A mass-murderer space rock happens about once every 30 million years on average. This leads to a probability of such an event occurring in the next second to about 10-15. That's 45 orders of magnitude more probable than the SHA-256 collision."<p>Link: <a href="https://stackoverflow.com/questions/4014090/is-it-safe-to-ignore-the-possibility-of-sha-collisions-in-practice" rel="nofollow">https://stackoverflow.com/questions/4014090/is-it-safe-to-ig...</a>