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And this vast computational effort is the cryptocurrency's Achilles heel, says Alex de Vries, the founder of the Digiconomist website and an expert on Bitcoin. Now that over 18.5m bitcoin have been mined, the average computer can no longer mine bitcoins. Instead, mining now requires special computer equipment that can handle the intense processing power needed to get bitcoin today. And, of course, these special computers need a lot of electricity to run. Some believe his cancer has nothing to do with his attitudes -- and that includes Byrne himself. But his concern and determination are very real. Itapos;s evident yet again with Overstockapos;s move to bitcoin. To many, the bitcoin revolution is insanity, but after deciding the digital currency was the way forward, Byrne struck a deal with a bitcoin payment processor and pushed the digital currency onto his site in a matter of days. "I didnapos;t want someone else to beat us," he says. Days after that, he moved millions from his personal fortune into the digital currency.