Modern people will use fingerprints in the office to prove the validity of documents. In fact, this form has existed since ancient times. Ancient people often used fingerprints when solving crimes or drawing documents. In ancient times, there was no fingerprint identification. Why do you want to sign and fingerprint?

Everyone's fingerprints are unique.

Although there was no fingerprint identification in ancient times, signatures were still required. Probably because they know that everyone's fingerprints are unique, and ancient people also like to use fingerprints to solve crimes. Leaving fingerprints on some documents also proves that the person who printed the fingerprints has read this document and that he has read that document. He is already an insider, so he uses fingerprints to represent him.

A fingerprint can represent a person.

Although it was impossible to identify a person by fingerprints in ancient times, it is also possible to determine whether a person is him or not by fingerprints. Because everyone's fingerprints will be different no matter which finger. So people in ancient times were very smart. They can prove whether a person has read the document according to fingerprints. Then according to a person's fingerprint, he draws a bet to prove that he is that person.

Ancient fingerprints are equivalent to today's signatures.

Although ancient fingerprints are not so advanced, they can also prove the validity of letters. If a person doesn't fingerprint a document or online, it is impossible to prove whether that person knows that, which is illegal and invalid. In fact, signing a contract now is the same concept as fingerprinting in ancient times.

Generally speaking, in ancient times, fingerprints were used to pledge, just to prove the validity of that contract or document, which was realized by fingerprints.