Bank of Japan Tests Blockchain for Interbank Settlement

The Bank of Japan (BOJ) has launched a sandbox experiment to test blockchain-based settlement of current account deposits held by financial institutions at the central bank.

Governor Kazuo Ueda announced that the initiative will examine how distributed ledger technology could be applied to interbank settlements, rather than focusing solely on consumer-facing central bank digital currencies (CBDCs).

Under the experiment, the BOJ will test a model that tokenizes bank deposits on a blockchain platform. By representing central bank deposits digitally on a shared ledger, the project aims to improve the speed and efficiency of Japan’s interbank payment system.

If successful, the new model could enable near-instant reserve transfers between banks on a 24/7 basis, removing the time restrictions associated with existing frameworks.

Officials say this has the potential to reduce operational burdens while streamlining transaction verification and reconciliation.

The central bank has indicated that integration with private-sector digital money initiatives is also under consideration, including stablecoin projects led by Japan’s three megabanks. Such interoperability could lay the groundwork for a broader digital financial ecosystem spanning both public and private money.

Beyond payments, the BOJ is assessing how smart contracts and programmable money might reshape securities settlement and wider financial market structures. However, the bank has stressed that it is proceeding cautiously, highlighting the need to address technological risks such as vulnerabilities in smart contract code and broader cybersecurity concerns.

The sandbox forms part of Japan’s broader effort to modernize its financial infrastructure and prepare for future digital models, including cross-border settlement and deeper integration with emerging blockchain-based systems.