People began to like to do things with fingerprints in the Qin Dynasty. At that time, for the integrity of the literature, people chose to press their fingerprints on wooden slips to record very important things at that time. This piece of wood will be inspected by a special inspector. They will check whether the fingerprints on the wooden strips are consistent with the original fingerprints. If it doesn't agree, it means that the batten has been opened.
Although the ancients did not have such a high technology to identify fingerprints, they could also identify fingerprints. Because at that time, they found that everyone's palm prints or finger fingerprints were different, and everyone's fingerprints were also a symbol of identity at that time. Because the education level of ancient people is generally low, people often directly press their fingerprints on documents, which is convenient, simple and quick, and can also let others know that you have read the documents and authorize them yourself.
And at that time, people's sense of contract was very high. At that time, people thought that as long as you signed the contract and pressed your handprint, the agreement was reached, and if you didn't follow the contract, you would die. At that time, people were very superstitious. In order not to be punished by God, people would not violate the contract. There was no fingerprint identification technology in ancient times, but ancient people were also very smart. They have other ways to identify fingerprints. Human fingerprints are very obvious, and it is easy to distinguish the differences in shape.