From September 23 onwards, Chinese mainland resumed issuing visas for visitors to Macao. Thanks to the mutual recognition system of Macao blockchain health code and Guangdong health code launched in May, mainland Chinese tourists can apply and use Guangdong health code to verify their health status when entering Macao. Up to date, more than 17 million people have cleared customs between Chinese mainland and Macao using the blockchain system. The average time of receiving, transforming, and generating the health code for the first time is only 100 seconds. And it will only take less than 3 seconds to complete the procedure when traveler clears customs again.