The idea of ??blockchain technology can be traced back to 1991. In order to ensure that the timestamp file cannot be traced and tampered with, two scientists at the time, Stuart Haber and W. Scott Stornetta, launched a practical computing solution.
The system uses a block encryption chain to store timestamp files, and in 1992, Merkle trees were also included in the system, which grouped multiple documents into one block. The new technology has greatly improved efficiency. Unfortunately, no one cared about this technology and it was slowly abandoned. The patent also expired in 2004, four years before Bitcoin was born.