In fact, the "health code" is based on real data. Self-declaration on the Internet and background audit can generate personal QR code.
It is worth noting that the health code is divided into "green code", "yellow code" and "red code" management, and the "green code" personnel take their temperature at the bayonet or temperature measuring point, and are allowed to pass without fever symptoms; "Code Yellow" and "red team" personnel cannot pass. The health code will be transcoded according to personal health status and punching, and the "green code" is valid for three days. During the validity period, citizens must complete health registration at least once before they can get an automatic extension, otherwise they will be turned into "yellow code".