Modern people are having a blast playing with digital currencies! Back in the Shu Han era, we used 'Zhi Bai Wu Zhu', which was coarsely crafted and not very pure copper. It was first made by Zhuge Liang in Qianwei, Sichuan, with the character 'Wei' cast in seal script on the back, written by his own hand. It was a type of square hole coin and one of the earliest coins with inscriptions on both sides. At that time, buying a cow cost over 100 kilograms of these coins, which were heavy and inconvenient to carry. After I became emperor, I made some improvements and created two new coins, 'Zhi Bai' and 'Zhi Yi', both with clerical script that was solemn in calligraphy. At that time, we prohibited the common people from minting coins; only we were allowed to mint them, and anyone caught doing so would be executed. The Wei and Wu states also minted their own coins, but Wu's coins were notably poorly made and very light. Later, during the Song Dynasty, merchants were clever and invented paper money in Chengdu, though at that time they didn't dare to call it 'money'; they referred to it as promissory notes and called it 'Jiaozi'. 😁 Eventually, everyone realized that paper could also serve as money and was even cheaper to produce, leading to the obsolescence of copper coins. 😁