TOPSHOT - A technician inspects the backside of bitcoin mining at Bitfarms in Saint Hyacinthe, Quebec on March 19, 2018. - Bitcoin is a cryptocurrency and worldwide payment system. It is the first decentralized digital currency, as the system works based on the blockchain technology without a central bank or single administrator. (Photo by Lars Hagberg / AFP) (Photo by LARS HAGBERG/AFP via Getty Images)AFP via Getty ImagesShares of Bitfarm have risen 211% this year.Why? Bitfarm – a Toronto-based bitcoin mi ...