Throughout 2018, Bitcoin’s price has slowly fallen from the highs near $20,000 to roughly $4000 today. Opposite this massive decrease in price, though, is the hash rate on the Bitcoin network: it has mainly gone up in 2018, starting the year averaging less than 15 exahashes per second, now averaging in the 30-40 exahash range, with a peak in November of ~60 exahashes. An exahash? That's a billion gigahashes per second, or a billion billion -- that's 1,000,000,000,000,000,000 -- hashes per second. That's a lot of hashes.
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