The cryptocurrency winter has turned to spring: having slumped from $20,000 in late 2017 to $3,200 a year later, bitcoin has lately risen like a rocket to $8,800. Though it doesn’t change my negative opinion, I admit that if I had bought a fistful of these wacky gaming chips last October when I gave the crypto concept a kicking at our Spectator conference on the subject, I’d be up almost 40 per cent.