1. Look at the reverse side of the certificate. There is a query URL. After logging in, you can query according to the prompt. The online certificate must be exactly the same as the entity certificate.
2. Copy the name of the institution, and inquire whether the certification institution that issued the certificate is the authoritative certification institution of national qualification certification.
3. Weigh with a jewelry scale, accurate to two decimal places, and the gram weight must be exactly the same as that marked on the certificate.
After these three pieces of cloth, the authenticity of the certificate can be determined. Illustration: