TL;DR
- Bank of Japan (BoJ) has started a sandbox test of blockchain-based settlement in central bank money
- Governor Kazuo Ueda confirmed the initiative, according to The Block
- Japan thus becomes part of a global wave of central banks exploring DLT for interbank settlements
- The project is currently in a test phase — no decision on rollout has been made
Japan Joins the Global DLT Wave
The Bank of Japan is testing whether central bank money can function within blockchain-based systems. This was recently announced by Governor Kazuo Ueda, according to The Block. The initiative takes the form of a so-called sandbox — a controlled test environment where the technology can be tried out without dictating any future implementation.
Ueda clarified that the sandbox is underway but emphasized that it is about exploration and not a decision to introduce a full-scale blockchain-based settlement system.
What is DLT-Based Interbank Settlement?
Traditional interbank settlements go through centralized systems where transactions are cleared and settled over time. Distributed Ledger Technology (DLT) — such as blockchain — allows settlements to occur near-instantaneously between parties, without the same need for intermediaries.
Potential benefits include reduced costs, lower counterparty risk, and faster execution. However, significant challenges remain regarding scalability, interoperability with existing systems, and regulatory frameworks.
Japan Not Alone — But Late to the Party?
BoJ's initiative places Japan in the company of a number of leading central banks that have already progressed further in their exploratory work. The European Central Bank system has conducted real transaction trials and plans a pilot launch during 2026. Singapore's MAS recently conducted a live test with three of the country's largest banks — DBS, OCBC, and UOB — in November 2025, where interbank lending was settled in wholesale CBDC.
In this context, Japan's sandbox phase appears to be a relatively early step. However, it is important to note that sandbox testing is standard methodology for central banks wishing to evaluate technology without committing to implementation.
Risks and Open Questions
Central banks worldwide emphasize that DLT-based systems are currently significantly smaller in scale than traditional settlement systems. Questions about interoperability — i.e., the ability to communicate with existing infrastructure — legal frameworks, and governance of shared platforms are unresolved challenges that must be addressed before any full implementation.
For Japan, there is currently little public information about which technology platform is being used in the sandbox, which financial institutions are involved, or what timeline the BoJ is operating with. The Block only reports that the test is underway and confirmed by the central bank governor himself.
What Happens Next?
The Bank of Japan's next steps will likely depend on what the sandbox testing reveals regarding technical and legal possibilities and limitations. Globally, developments indicate that wholesale CBDC and DLT-based settlement are gradually moving from experiment to real infrastructure — but the pace varies significantly between jurisdictions.
For now, Ueda's statement should be read as a confirmation that Japan is in the race — not that the finish line is in sight.
