Putting JGB Repo Onchain Without Tokenizing the Bond: MUFG's Bet on Linking the Book-Entry Register

The Core of the Trial Is the Decision Not to Tokenize the Bond

On August 13, Mitsubishi UFJ Financial Group, Mitsubishi UFJ Morgan Stanley Securities, Mitsubishi UFJ Trust and Banking, and MUFG Bank announced a collaboration with Digital Asset Holdings and Progmat on a proof of concept for moving Japanese government bond repo transactions onchain. The infrastructure is the Canton Network, a blockchain built specifically for institutional finance. The trial forms part of a project that received support from the Financial Services Agency's Payment Innovation Project in February 2026.

The design principle stated in the announcement is unambiguous. The bond's legal character as a book-entry JGB is preserved, while the book-entry register held by the account management institution is updated in coordination with the blockchain. The authoritative record of ownership remains inside the existing transfer system, and the blockchain synchronizes state changes to it. According to Nikkei's advance report, issuing a tokenized "digital JGB" was considered and set aside because the legal questions have not been resolved.

This should be read as a choice of sequence rather than a technical compromise. Tokenizing the legal right itself would require statutory change or settled interpretation, and that wait could run for years. Putting the settlement process onchain can begin within current law. MUFG has carved out the portion that can operate without waiting for the legal framework to move.

T+1 Idle Cash and the Untapped Intraday Repo Market

Repo transactions let financial institutions borrow short-term cash against government bonds as collateral. According to Nikkei, outstanding balances reached roughly 270 trillion yen as of 2025. Settlement currently takes one business day from execution under a T+1 convention, forcing institutions to hold surplus cash against the timing gap. Instant settlement would shorten the period during which that capital is immobilized.

A Financial Stability Board report published on February 4, 2026 estimates that government bond-backed repo outstanding stood at approximately 16 trillion US dollars (roughly 2,560 trillion yen at 160 yen to the dollar) at the end of 2024, representing about 80 percent of all repo outstanding. By jurisdiction, the United States accounts for roughly 60 percent, the United Kingdom and the euro area for about 15 percent each, and Japan for around 10 percent. Japan carries a tenth of the global market on its own, yet settlement has been confined to daytime hours on business days. Nikkei also reported complaints from overseas investors that time zone differences make Japanese daytime trading difficult.

More significant is that intraday repo, which opens and closes on the same trading day and is already commercial in the United States and Europe, does not exist as a market in Japan. Where settlement takes a business day, a product for borrowing cash for a few hours cannot exist at all. Moving repo onchain would not merely make the existing market more efficient; it could create a market in a tenor that has never been available.

Two Models Already Running in the United States

Two distinct approaches are advancing in the US market. J.P. Morgan operates an intraday repo application on its proprietary Kinexys platform, and the bank states that cumulative transaction volume has reached 300 billion US dollars (roughly 48 trillion yen). This is the internally closed model, in which a bank runs the process while retaining control of both its balance sheet and its ledger.

The second is the market infrastructure model. The Depository Trust and Clearing Corporation partnered with Digital Asset in December 2025 to tokenize US Treasury securities custodied at DTC on the Canton Network. An SEC no-action letter issued in December 2025 established a three-year framework covering Russell 1000 constituents, major index ETFs and US Treasuries. Limited production trades began in July 2026, with full service launch scheduled for October, and more than fifty financial firms are participating.

Structurally, MUFG's trial resembles the second model. A holder of the central register connects it to a blockchain, making this a Japanese counterpart to the DTCC approach. The decisive difference is that DTCC is neutral market infrastructure, whereas MUFG holds three roles simultaneously within its own group: market participant, account management institution and deposit-taking institution. The announcement names Mitsubishi UFJ Morgan Stanley Securities and MUFG Bank as market participants, MUFG Bank and Mitsubishi UFJ Trust and Banking as account management institutions, and MUFG Bank as the deposit-taking institution. Only an entity that can internalize the boundary can run this trial as a single group.

Who Controls the Connecting Device

Progmat's role is to analyze existing operational practice and productize the intermediary device that links the current book-entry register system to the Canton Network and other blockchains, along with the interface to institutional-grade onchain repo market infrastructure. Secured Finance AG will implement the full repo lifecycle as smart contracts through its lending protocol. The firm also supplies the collateral infrastructure for UBS's tokenized money market fund uMINT.

An industry-wide framework is advancing in parallel. The Digital Asset Co-Creation Consortium hosted by Progmat, with 331 member organizations, established a Tokenized JGB and On-Chain Repo Working Group on May 8. More than forty organizations are participating, including the three megabanks alongside BlackRock Japan and State Street Trust and Banking. A report is expected around October. Domestically, Mizuho Financial Group and Nomura Holdings have also been running a trial on digital management of JGB collateral since April.

The cash leg is being built at the same time. On June 10, MUFG disclosed that a stablecoin jointly issued by three banks would begin live transactions during fiscal 2026, and that a council had been established to advance joint work. The collateral leg and the cash leg are on course to intersect within the same fiscal year, making fiscal 2026 the year in which Japan's onchain financial plumbing gets connected.

Business Development Insights

1. The point of entry is the register-linking device, not tokenization. What this trial demonstrates is that onchain settlement can work without tokenizing the legal right itself. The corollary is that the intermediary device reconciling the state of the existing book-entry register with a distributed ledger is the bottleneck, and whoever combines operational knowledge with implementation capability there occupies an indispensable position. Progmat's role is instructive for any company weighing an asset tokenization business: controlling the interface specification to an existing registry is far harder to displace than building a vessel for issuing tokens.
2. Vertical integration of roles is what sets the pace of experimentation. MUFG can run this trial as a single group because it simultaneously holds the roles of market participant, account management institution and deposit-taking institution. Institutions and corporates lacking that structure need multi-party agreement from the proof-of-concept stage onward and are therefore pushed toward consortium models. Identifying which role your organization lacks, and locking in a partner that holds it, will determine your entry timing. Conversely, the strategic value of holding account management institution status is larger than has generally been assumed.
3. Do not misread the sequencing of the collateral leg and the cash leg. Onchain repo requires both high-quality collateral in the form of government bonds and digital money for settlement. In Japan the cash leg advanced first, from the issuance of JPYC in October 2025, with serious work on the collateral leg beginning in 2026. Given that live transactions for the three-bank joint stablecoin are scheduled during fiscal 2026, the two legs are likely to connect between the end of fiscal 2026 and fiscal 2027. That timeline is the baseline for working backwards when planning tokenized asset or collateral management services. Assuming commercialization in fiscal 2027, the technical requirements for interconnection should be settled during fiscal 2026.

Sources

• CoinPost, "MUFG to use blockchain for instant JGB repo settlement, FY2027 = Nikkei" (August 13, 2026) https://coinpost.jp/?p=730882
• Mitsubishi UFJ Financial Group and three group companies, "Launch of a Proof of Concept on Moving Japanese Government Bond Repo Transactions Onchain" (August 13, 2026) https://www.mufg.jp/dam/pressrelease/2026/pdf/news-20260813-002_ja.pdf
• Nikkei, "Instant JGB trading to begin: MUFG targets FY2027 using blockchain" https://www.nikkei.com/article/DGXZQOUB048PJ0U6A800C2000000/
• Neweconomy, "Progmat and others establish Tokenized JGB Working Group" (May 8, 2026) https://www.neweconomy.jp/posts/572117
• Secured Finance AG press release on joining the Progmat/DCC Tokenized JGB and On-Chain Repo Working Group (May 8, 2026) https://prtimes.jp/main/html/rd/p/000000006.000172212.html
• Tatsuya Saito (Progmat), commentary on the MUFG JGB repo onchain project https://note.com/tatsu_s123/n/nc27cd0217eb1
• Financial Stability Board, "Vulnerabilities in Government Bond-backed Repo Markets" (February 4, 2026) https://www.fsb.org/uploads/P040226.pdf
• J.P. Morgan, "Blockchain Asset Tokenization with Kinexys" https://www.jpmorgan.com/insights/payments/blockchain-digital-assets/blockchain-kinexys-asset-tokenization
• Canton Network / DTCC, "DTCC and Digital Asset Partner to Tokenize DTC-Custodied U.S. Treasury Securities on the Canton Network" (December 17, 2025) https://www.canton.network/canton-network-press-releases/dtcc-and-digital-asset-partner-to-tokenize-dtc-custodied-u.s.-treasury-securities-on-the-canton-network
• CCN, "DTCC to Tokenize Russell 1000 Stocks and Treasuries in July Pilot" https://www.ccn.com/news/crypto/dtcc-launch-tokenized-stocks-etfs-treasuries-july-2026/
• MUFG Bank, "Start of live transactions during FY2026 for a stablecoin jointly issued by three banks, and establishment of a joint study council" (June 10, 2026) https://www.bk.mufg.jp/news/news2026/pdf/news0610.pdf