1. The health code is based on actual data, and is declared by citizens or people who return to work after rework online.
2. After background review, generate personal QR code.
3. As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city. According to the data of Health official website, if the health code is locked, take the nucleic acid test results to the community to unlock it. And that life and health of people are guarantee.