The development highlights the wide spectrum of regulatory treatments of cryptocurrencies. A major cryptocurrency exchange, Huobi Global , reportedly said that it will shut all user accounts in mainland China by the end of the year, following shortly after the country said that it was banning transactions in such instruments. Over the weekend the group, which operates from offices in Singapore, South Korea, the US and other countries, said that it has stopped allowing new customers in mainland China to register accounts ( Wall Street Journal, 26 September). The exchange will also retire existing accounts in China by the end...