Japan Open Chain Completes Testnet Migration for the "Tokyo Hardfork"
Japan Blockchain Foundation, Co., Ltd. (Head office: Shibuya-ku, Tokyo; Representative: Daimei Inaba, hereinafter "the Company"), the operator and administrator of the consortium behind Japan Open Chain (JOC), a fully Ethereum-compatible public blockchain co-operated by Japanese enterprises, is pleased to announce that the testnet migration for the "Tokyo Hardfork" — the largest protocol upgrade since the network's launch — scheduled for September 7, 2026, was completed successfully at block height 19,431,670.
As originally planned, after confirming that the testnet verification results present no issues, the Company plans to carry out Phase 1, "The Merge," on the mainnet in November 2026.
◽️ About the Tokyo Hardfork
For an overview of the Tokyo Hardfork, please see the following.
https://www.jbfd.org/en/news/joc-tokyo-hardfork-testnet
◽️ About "Japan Open Chain"
Japan Open Chain is a practical, Ethereum-compatible (Layer 1) public blockchain operated by Japanese companies. Together with leading industry giants and Web3 innovators, it aims to provide a secure, high-speed, and low-cost blockchain infrastructure accessible to users worldwide. This project seeks to revolutionize global digital finance by building future financial infrastructure through initiatives like bank-led stablecoin projects and the digitization of assets such as NFTs.
The blockchain is currently operated by validators (blockchain operation partners) including Dentsu Inc.; insprout Corporation; Kudasai Co., Ltd.; pixiv Inc.; Kyoto University of the Arts; Hatena Co., Ltd.; CAC Corporation; CYBERLINKS CO.,LTD.; G.U.Technologies, Inc.; and others. The blockchain is managed in a decentralized manner and is expected to expand to 21 validators in the future.
◽️ About Japan Blockchain Foundation Co., Ltd.
Japan Blockchain Foundation Co., Ltd. operates and manages the consortium for "Japan Open Chain," an enterprise-oriented public blockchain co-operated by trusted Japanese companies in compliance with Japanese law. Through infrastructure development that emphasizes governance design and regulatory compliance, the company promotes the social implementation of next-generation financial infrastructure, including stablecoin and token utilization by financial institutions, enterprises, and local governments.
[ Company Overview ]
Company Name ：Japan Blockchain Foundation Co., Ltd.
Location ：Cerulean Tower 15F, 26-1 Sakuragaoka-cho, Shibuya-ku, Tokyo, Japan
Representative ：Representative, Daimei Inaba
Founded ：April, 2018
URL ：https://www.jbfd.org/en/
Business Overview ：Operation and Management of Web3 Infrastructure
◽️ For Inquiries Regarding This Press Release
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Japan Blockchain Foundation Co., Ltd. - Public Relations
Inquiry Form: https://www.japanopenchain.org/en/contact
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