By the way, how did the waist tag of the ancient government identify the authenticity?

In the ancient court, government guards and others all had waist tags, but princes generally didn't. The Yu Pei and seal that he carries with him can be used as the symbol of the prince, so it is also counted as his waist tag. Because in ancient times (except the Qing Dynasty), Yu Pei, Wan Jian and Xiyin, both officials of the emperor, had different specifications and could not be confused, otherwise they were in danger of being beheaded.