In fact, in ancient times, people found that a person's fingerprint would not change no matter how it changed, so they thought that fingerprint was a very reliable thing, which led to the more popular signature now. Moreover, in ancient times, people actually paid more attention to fingerprints, because they thought it was a god to hold one's head three feet high, and they would be punished if they didn't honor their promises according to fingerprints, so this can't be changed at will.
Moreover, in ancient times, most people were illiterate and could not even write their own names. However, in order to show that he already knew the contents of the document, he later adopted the method of fingerprinting or even palmprint.
Now we can often see some innocent people being forced or even tortured to cover up an untrue evidence in film and television dramas. This can also show the authority of fingerprints at that time, but now, many documents are fingerprinted for insurance, but now our technology is more developed, and we can directly see whose fingerprints are.
But in ancient times, their methods were stupid, covering the whole palm, and some even covered the footprints. Therefore, people who specialized in fingerprint identification in ancient times knew at a glance whether their fingerprints were their own.
From now on, we are still using fingerprints, and we can see that this discovery is quite powerful. We have to say that the wisdom of the ancients is the greatest wealth.