The history of money is an eternal quest and game of "efficiency" and "trust" for humanity. From the cowrie shells in the Neolithic Age, which established value consensus through natural scarcity, to the bronze coins in the Shang and Zhou dynasties (such as copper shells) that embedded the mark of power into the form of currency; from the half-tael coins in the Qin and Han dynasties that unified the currency system with a round shape and square hole, to the Jiaozi in the Tang and Song dynasti...