You can be forgiven for thinking of Bitcoin, the best-known cryptocurrency, as the realm of thieves, Wall Street bankers and libertarian techies who’ve drunk too much Soylent. Despite recently intensified media interest, trading Bitcoin is not a particularly accessible hobby to folks outside the finance or tech worlds. So it’s healthy to be skeptical about Bitcoin’s promise, beyond its utility as a speculative investment or a means of laundering money or buying black market drugs.