Gold rice cake - Kinpei

…On the other hand, in the southern territory of the state of Chu, copper shells, which were a type of shell currency, were first made, but during the Warring States period, a type of copper shell called ant nose coins was cast and used. Around the same time, gold coins (gold cakes and gold plates) were made in Chu and used for transactions with large face values. The use of gold coins gradually spread to the countries of the Central Plains. …

*Some of the terminology explanations that mention "kinmochi" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…他方，南方の楚国の領内では初め貝貨の系統に属する銅貝が造られたが，戦国期には銅貝の一種，蟻鼻銭が鋳造され使用された。また楚では同じころ，金貨(金餅･金版)が造られ額面の大きな取引に用いられた。金貨の使用はしだいに中原の諸国にも広がった。…

※「金餅」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報