Japan launches blockchain sandbox! Testing real-time settlement of bank reserves and assessing the integration of private stablecoins

Bank of Japan Launches Regulatory Sandbox for Tokenized Demand Deposits, Promotes 24-Hour Settlement, and Participates in Agorá Program, Decides on Digital Yen by 2026

Ueda Kazuo Announces Launch of Regulatory Sandbox to Innovate Settlement System through Tokenized Demand Deposits

According to The Nikkei, Bank of Japan (BOJ) Governor Ueda Kazuo delivered a keynote speech titled “New Financial Ecosystem and Central Bank Roles” at the FIN/SUM 2026 Global Fintech Summit in Tokyo yesterday (3/3). In his speech, Ueda officially announced that the BOJ has begun a new “regulatory sandbox” experiment aimed at testing how financial institutions can settle their central bank deposits (i.e., commercial banks’ reserve deposits at the BOJ) using blockchain technology.

The core of this initiative is to represent central bank currency as digital tokens on a blockchain, exploring broader and more efficient settlement methods. Ueda emphasized that blockchain technology has moved from theoretical research into practical application, especially amid the rapid growth of decentralized finance (DeFi), smart contracts, and tokenized assets. The BOJ must actively adapt to the new financial ecosystem shaped by programmable money. For this experiment, external experts will be invited to collaborate, focusing on connecting blockchain systems with the current financial network (BOJ-NET), and conducting detailed technical validation for key scenarios such as interbank and securities settlement.

Achieving 24/7 Real-Time Large-Scale Settlement through Technical Collaboration with Private Stablecoin Ecosystems

The main technical advantage of this blockchain experiment is overcoming the time limitations of traditional financial infrastructure. Currently, the BOJ’s settlement system does not operate on weekends or at night. With blockchain technology, it will be possible to realize real-time large-value settlement 24 hours a day, 365 days a year, significantly reducing cross-border remittance time and costs, and improving settlement efficiency.

Analysts note that processing reserve bank settlement via blockchain can effectively reduce the risk of “gridlock” during extreme market stress or financial turbulence caused by settlement delays. Additionally, the BOJ plans to explore integrating this technology with smart contracts to develop automated settlement mechanisms triggered by specific conditions.

It is noteworthy that Ueda mentioned expanding the scope of technological collaboration to the private sector, particularly regarding the stablecoin projects jointly promoted by major financial groups such as Mitsubishi UFJ, Sumitomo Mitsui, and Mizuho. The BOJ is evaluating the interoperability between central bank digital currency (CBDC) and privately issued stablecoins. This public-private technological cooperation aims to ensure “single currency” (Singleness of Money) in the digital currency environment, maintaining financial system stability and liquidity.

Further Reading
Japan’s Three Major Banks Join Forces! Digital Yen Stablecoin Verification Initiated, Financial Services Agency Promotes a New Era of Digital Payments

Global Wholesale CBDC Initiatives, Participating in Agorá Program to Optimize International Payment Networks

The BOJ’s blockchain experiments are not limited domestically but also actively participate in the international initiative “Project Agorá,” led by the Bank for International Settlements (BIS) and multiple central banks. This project aims to build a tokenized central bank deposit mechanism on blockchain networks to address issues in cross-border payments, such as cumbersome procedures, low transparency, and high costs.

Ueda stated that combining wholesale CBDC with tokenized deposits from commercial banks can significantly streamline international clearing processes and ensure finality of settlement.

Furthermore, with the rapid development of artificial intelligence (AI), the BOJ plans to integrate AI with blockchain technology, leveraging AI’s powerful data analysis capabilities to monitor blockchain transactions, enhance risk management, and strengthen compliance with anti-money laundering (AML) and counter-terrorist financing (CFT) regulations. While blockchain automation offers transaction convenience, Ueda also warned that vulnerabilities in smart contract code could pose direct threats to financial stability. Therefore, rigorous validation of technical risks will be a prerequisite for practical deployment in future experiments.

Key Period for Digital Yen Decision in 2026: Building a Trust-Based Digital Infrastructure

Alongside promoting wholesale settlement innovation, the BOJ’s pilot program for retail CBDC is ongoing. Since launching CBDC experiments in 2021 and entering pilot testing in 2023, the BOJ plans to make a final decision by 2026 on whether to issue a retail digital yen to the public.

Despite the maturity of Japan’s digital payment systems and the societal preference for cash, the BOJ believes that as a “trust anchor” in the economy, central bank money must evolve into a secure digital asset in the digital age to connect various payment tools. The Japanese government also regards blockchain and tokenization as key pillars of the “New Capitalism 2025” growth strategy, with the Financial Services Agency (FSA) working to optimize regulations for tokenized assets, laying the foundation for a digital financial environment.

This blockchain experiment by the BOJ is not only aimed at enhancing technological efficiency but also at establishing Japan’s competitiveness in the global central bank digital currency race and next-generation financial infrastructure.