2019 年 34 巻 4 号 p. 377-387
Blockchain use cases have been expanded from crypto currency to the area of finance (such as money transfer), and industry (such as supply chain, digital ID, art trade). This article presents these cases abroad, especially by the Japanese startup and aims to show its contribution to the global blockchain development. Hyperledger is one of the platformers in blockchain fields and Soramitsu, a Japanese startup, is a key developer for Hyperledger Iroha, a certified production-ready Hyperledger platform. This Japanese startup develops National Banking System in Cambodia, the Decentralized Digital Depository with Moscow Stock Exchange, and KYC system for BCA, the third largest Indonesian commercial bank.