Do we need an officially-sanctioned, government-backed crypto-currency underwritten by sterling – a ‘Britcoin’ – as Rishi Sunak is said to be advocating? At first sight it is hard to see the attraction. Surely, there are two principle reasons why people feel attracted to Bitcoin and other cryptocurrencies. Firstly, if you are a drug dealer, you might hope that it is a way of keeping your stash of wealth beyond the reach of law enforcers.