Hangzhou, the capital city of Zhejiang Province, was the first Chinese city to introduce a “health code” system. Originally, the health codes were green, yellow, and red zones; but since the end of January, orange was added to indicate that the code holder resides in a pandemic prevention zone. In addition, use of the health code is being controlled ever more stringently and has become a tool for monitoring people and cracking down on or restricting the movements of dissidents. Hangzhou’s health code system is based on Zhejiang’s Government Cloud, a health code engine developed in three days by Alibaba Group Holding Ltd. On Feb. 17, Zhejiang became the first Chinese province to have “full health code coverage.” On Feb. 11, when the health code was officially launched in Hangzhou, the number of applications on the first day exceeded 1.3 million, because only people with green codes could pass through …