In layman's terms, the family genealogy is recited aloud, with each person memorizing it in their mind. The brain becomes a collection of nodes, and when people meet, they compare the records to determine kinship, using 51% accuracy as the standard. It's said this practice existed in the pre-Qin and Spring and Autumn periods. This is actually the earliest form of distributed storage thinking, miraculously passed down from paper genealogies to mental genealogies by the southwestern Yi people. This is still amazing—rote memorization of the genealogy. Blockchain information technology is, in essence, a form of rudimentary mathematics.