When Changpeng Zhao was sentenced to four months in prison this week by a court in the US, it marked the close of yet another dramatic chapter in cryptocurrency, an industry that can never be accused of being boring. CZ, as he is known, the founder and former chief executive of Binance, the world’s largest cryptocurrency exchange, pleaded guilty to anti-money laundering violations in the US last year and resigned his CEO post while Binance tallied up $4.3 billion in fines. Central to the cases against Binance was that its cryptocurrency exchange was used by illegal actors and the company…