Keio University (Address: Minato City, Tokyo; President: Kohei Itoh), in collaboration with Kokushu Tech Innovation Promotion Organization (Address: Chuo City, Tokyo; President: Nobuyuki Sato), has developed an auction system for aged sake that utilizes NFTs. This project is a continuation of the verification study on food chains which was announced in a press release last year and is aimed at creating new value for sake and promoting Japanese sake culture in novel ways.