What font does the calligraphy grading seal use?

The seal style of calligraphy grading seal. According to relevant information, the official rules of calligraphy grading require the use of seal script. Seal script, one of the ancient Chinese characters, also known as seal script, is a general term for ancient Chinese characters. Those who seal the seal spread it, spread its physics and apply it endlessly. The ancients believed that seal script was written by Cang Xie, but this is not credible. The generation of a kind of writing needs a long development process, and it is impossible for a person to complete it in a short time.