Japan's central bank published "Verifiable Credentials for Identity Assurance in the Digital Society: An Overview and Trends in Standards Development" through its Payment and Settlement Systems Department on Thursday. Authored by four BOJ researchers, Yamada Nodoka, Shinzaki Takashi, Shimizu Tomoko, and Okabe Kota, the paper surveys the technical architecture behind verifiable credentials (VCs), a category of cryptographically signed digital certificates that allow individuals and organizations to prove claims about themselves without requiring real-time contact with the issuing authority. The timing is notable: Japan faces a decision this year on whether to issue a retail digital yen, and Governor Kazuo Ueda announced in March that the BOJ is now running technical experiments on blockchain-based settlement using central bank current accounts. The BOJ also participates in Project Agorá, a multi-central-bank initiative aimed at tokenizing wholesale deposits for cross-border payments, which makes the institution's close attention to VC identity infrastructure particularly timely.

What Verifiable Credentials Actually Do

A verifiable credential functions like a tamper-proof digital document stored in a user's wallet app. A government, bank, or university issues the credential, the user holds it, and a third party can verify its authenticity using cryptographic signatures without going back to the issuer. The BOJ paper draws on the W3C Verifiable Credentials 2.0 specification, which the World Wide Web Consortium published as a formal standard on May 15, 2025. That specification supports selective disclosure, meaning a user can prove they are over 18 without revealing their date of birth, and is being designed to accommodate post-quantum cryptographic methods as that threat landscape evolves.

The paper gives particular attention to ISO 17442-3, published on October 14, 2024, which standardizes the verifiable Legal Entity Identifier (vLEI). Developed by the Global Legal Entity Identifier Foundation (GLEIF), the vLEI uses the KERI protocol and ACDC (Authentic Chained Data Container) technology to cryptographically verify not just that an organization exists but also which individuals are authorized to act on its behalf. This matters significantly for cross-border KYC, trade finance, and regulatory reporting, where correspondent banking relationships have historically relied on manual documentation chains.

The Regulatory Backdrop

Three major standards frameworks are now converging. The W3C VC 2.0 specification provides the foundational data model. ISO 17442-3 handles enterprise and financial entity identity. The European Union's eIDAS 2.0 regulation requires all 27 member states to deploy compliant digital identity wallets by December 2026, built on top of the W3C VC standard using OpenID4VCI and OpenID4VP protocols. The BOJ paper engages with these standards developments, making it a strategic reference document rather than a purely academic exercise.

Speaking at the VC 2.0 specification launch last year, W3C CEO Seth Dobbs articulated the broader ambition behind the standard: "Building the global digital trust upon interoperable, trustworthy, and privacy-aware open web standards." The W3C working group is now operating under a new charter from April 2026 and is targeting additional formal recommendations by September 2026.

The decentralized identity market stood at between $2.56 billion and $4.89 billion in 2025 and is projected to reach approximately $7.4 billion in 2026, according to Security Boulevard's enterprise playbook report. The compound annual growth rate exceeds 50 percent through 2030. For financial institutions, VCs offer concrete cost reductions: KYC onboarding costs fall by 30 to 50 percent, and repeat verification costs drop by up to 60 percent, according to figures compiled by Security Boulevard drawing on World Bank and Mordor Intelligence data.

Regional Impact: South Asia and Africa

For developers and policymakers outside Japan, the BOJ paper carries practical weight. India is the most advanced market in South Asia for VC-adjacent infrastructure. The UIDAI amended its Aadhaar Authentication Regulations in 2025 to formally introduce Aadhaar Verifiable Credentials, which support selective disclosure and user-controlled sharing. DigiLocker, the national document storage system with roughly 513 million users (approximately 40 percent of the population), is being evaluated as a verifiable credential locker. As Indian fintech firms expand into Southeast Asia, the Middle East, and East Africa, interoperability with the W3C VC 2.0 framework becomes a technical prerequisite for institutional partnerships.

Sri Lanka is targeting a national biometric digital ID rollout, with first digital IDs anticipated in Q3 to Q4 2026. Nepal is advancing a World Bank-backed digital transformation program that includes a verifiable credentials locker component.

In Sub-Saharan Africa, the World Bank's Global Findex 2025 report places adult financial account ownership at 58 percent, up from 34 percent in 2014. Trinsic's 2025 landscape report tracks 16 digital ID schemes across the continent covering approximately 300 million people. Countries including Nigeria, Kenya, South Africa, and Ethiopia are actively exploring blockchain-based identity verification, and the GSMA's Mobile for Development programme has identified digital identity as a foundational prerequisite for financial inclusion across the region. ISO vLEI adoption offers African businesses a path to cryptographically verifiable organizational credentials that major financial institutions recognize globally, which could reduce the friction African firms face in correspondent banking.

That regional momentum connects directly to the Asia Pacific outlook. The Asia Pacific region carries the highest projected regional CAGR for VC adoption at 11.52 percent once the market matures past 2027, a figure that helps explain why institutions such as the BOJ are moving from observation to active technical engagement with VC standards.

What Comes Next

Governor Ueda, speaking at FIN/SUM 2026 in March, said the BOJ "will provide a digital form of cash when in demand by the wider public." Any retail digital yen will require an identity layer capable of satisfying anti-money-laundering requirements while protecting user privacy. Verifiable credentials with zero-knowledge proofs, which allow a wallet to prove it is sanctions-cleared without exposing personal data, are among the leading candidate technologies for that function. The BOJ's decision to publish a detailed technical overview of the current VC standards landscape suggests the institution is actively studying the infrastructure options available, a posture that analysts in the digital identity space read as preparation rather than passive monitoring.

For Web3 developers building KYC or compliance layers, the practical takeaway is straightforward: stacks built on W3C VC 2.0 now have alignment with the EU eIDAS 2.0 ecosystem, the ISO vLEI enterprise standard, and the research framework of one of the G7's most closely watched central banks.