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Bitcoin networks surpasses 2^80 hashes per week



https://blockexplorer.com/q/hashestowin
log(171833398380382098659*24*60*7)/log(2)


Gives context to the obsolescence of 80-bit block ciphers (it only takes
ten million dollars of dedicated hardware to crack an 80-bit cipher). And
context to the NSA's design of Skipjack.

Naturally even a 2^64 collision attack requires implausible amounts of
storage, so properly designed hash functions should be secure for the
indefinite future.
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