In the space of a few years, Bitcoin has gone from an idea ignored or maligned by almost everyone to an asset with a market cap of more than $12 billion. Venture capital firms, Goldman Sachs, the New York Stock Exchange, and billionaires such as Richard Branson and Peter Thiel have invested more than $1 billion in companies built on this groundbreaking technology. Bill Gates has even declared it ‘better than currency’.The pioneers of Bitcoin were twenty-first-century outlaws – cryp...