As we all know, modern fingerprint recognition technology plays its unique role in many aspects such as screen unlocking and personal identity verification. Looking back at history, although ancient science and technology was not as developed as it is now, the ancient Chinese have realized that everyone's fingerprints are different and can be used to solve crimes, identify personal identities, and replace signatures with fingerprints. In the Qin Dynasty Slips "Feng Diagnostic Point Robber", it is written that there are knees, handwriting, knees and hands inside and outside the acupoint. ?This sentence means that the hands and wrists of tomb robbers are different from ordinary people, and they will leave hand marks when robbing tombs. It can be seen that as early as the Qin Dynasty, fingerprints were used to solve crimes, and fingerprints became key evidence in solving crimes.

In ancient times, another function of fingerprints was to identify individuals. As early as the Song Dynasty, a book called "History of the Song Dynasty - Yuan Jiang Biography" recorded that local departments would collect people's fingerprints from door to door. In this way, no matter where people go, when they need to verify their identity, they can retrieve their fingerprint information from their place of residence to determine their personal information. No matter how a person's appearance changes, his fingerprints will never change.

In ancient times, although there were many scholars, ordinary civilians and women at home did not read or write due to family conditions and the influence of feudal ideas, resulting in a lot of illiteracy in ancient times. They can't even write their own names, which seriously affects the officials' management of society. So they came up with a way to replace signatures with handprints, which improved work efficiency and made life easier for ordinary people.

Although ancient fingerprints are rarely used in modern life, modern people use certain auxiliary tools to connect them with fingerprints to identify personal identities. Although ancient handprints are not so accurate, they fully prove the wisdom of ancient people. Moreover, fingerprint recognition did not appear in Britain until the end of the 18th century. This shows that ancient China still had advanced ideas.