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Bloomberg Best of the Year 2017: Power supply units and illuminated cooling fans sit on shelves linked to cryptocurrency mining machines at the SberBit mining 'hotel' in Moscow, Russia, on Saturday, Dec. 9, 2017. Photographer: Andrey Rudakov/Bloomberg via Getty Images

Bloomberg Best of the Year 2017: Power supply units and illuminated cooling fans sit on shelves linked to cryptocurrency mining machines at the SberBit mining 'hotel' in Moscow, Russia, on Saturday, Dec. 9, 2017. Photographer: Andrey Rudakov/Bloomberg via Getty Images