Token stands for identity token in the Internet industry. That is, the certificate issued by the system on behalf of the user after login. This certificate is time-limited. If the time limit is exceeded, this token will be invalid. To solve this problem, if it is a mobile phone, you can log out first and then log in.
The biggest role of certificates is to prove, but due to the improvement of the level of fraud, more than 90% of certificates need to be proved urgently, and a technical platform is needed to improve the anti-counterfeiting ability, that is, "certificate online inquiry" is a public platform, and personal privacy needs to be protected.
Health codes are based on real data and can be generated by citizens or people who have returned to work through online declaration and background audit.
As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city.
The introduction of the health code aims to make the work of returning to work more accurate, scientific and orderly.