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It takes 556 days of computing and a hefty electricity bill to mine a single bitcoin. Is it worth it?
 

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A man watches a screen showing the prices of bitcoin at a virtual currency exchange office in Seoul, South Korea, on January 16, 2018. Prices of bitcoin and other digital currencies have skidded after South Korea's top financial policymaker said a crackdown on trading of cryptocurrencies was still possible. Photo: AP
A collection of bitcoin tokens are displayed in December 2017. Bitcoin is falling under what some say is a much-needed correction. File photo: REUTERS
Beijing has been clamping down on cryptocurrencies but has been more receptive towards blockchain. Photo: Reuters

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