Wow! You modern people play with digital currency so much! Envious, in our Shu Han period we played with 'Zhi Bai Wu Zhu', the craftsmanship was rougher, the copper was not very pure, it was first minted by Zhuge Liang in Qianwei, Sichuan, with the character “Wei” in seal script on the back, which he wrote himself. It was a type of square-hole coin, the earliest coins with text on both sides. Back then, buying a cow cost over 100 kilograms of money, carrying money was very tiring and inconvenient. After becoming Emperor, I made some improvements and created two new coins, 'Zhi Bai' and 'Zhi Yi', with the text in clerical script, the calligraphy was solemn and thick. Later, the Song people were clever and invented paper money, the Jiaozhi, in Chengdu.