Wow! You modern people are having so much fun playing with digital currencies! I'm envious. In the Shu Han period, we used 'Zhi Bai Wu Zhu', which was coarsely made, with impure copper. It was first minted by Zhuge Liang in Qianwei, Sichuan, and the back side had the seal script character 'Wei', written in his own hand. It was a type of square-hole money, one of the earliest coins with inscriptions on both sides. Back then, buying a cow required over 100 kilograms of money, and carrying coins was tiring and inconvenient. After I became emperor, I made some improvements and created two new coins: 'Zhi Bai' and 'Zhi Yi', both with clerical script. The calligraphy was dignified and robust. Later, the Song people were clever and invented paper money, known as 'Jiao Zi', in Chengdu.