In 2011, Gareth Grobler, a former Investec banker who was working in London building up his own software company EyeDesk, was tipped off about this payment system that went by the innocuous name of bitcoin. "I thought it had to be a scam," says Grobler from London, where he spends most of his time. "I spent three days looking at it from top to bottom, trying to figure out where the flaw was." At the time, bitcoin was a fledgling experiment in digital or "cryptocurrencies", created only three years earlier by the mysterious Satoshi Nakamoto, a pseudonym for what may or may not be one individual. But the more Grobler learnt about the philosophy underpinning bitcoin (the first truly independent peer-to-peer currency, premised on the cuddly libertarian ideals of markets free from government meddling), the more he grew entranced.So in 2012, Grobler sold his company to Britain’s National Health Service and began trading bitcoin. The next year, he launched ICE³X, a Joburg-based bitcoin exc...

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