My mum, a privacy-minded German in her 80s, hates using her credit card. She still carries around wads of cash to pay for everything: a coffee, her weekly supermarket shopping — even a plane ticket to visit me in Wales.
She would get along with Satoshi Nakamoto, the legendary inventor of Bitcoin who operates under a pseudonym and created the first cryptocurrency — a form of electronic cash that leaves no digital trace for banks and governments to follow.
Nakamoto is a godlike figure in the crypto community. But who is he really? Countless people have tried to unmask him. My colleague John Carreyrou, an investigative reporter who uncovered the Theranos scandal, thinks he figured it out. I spoke to him about his investigation.