Verifiable Credentials Data Model 2.0: What Changed and Why It Matters

The model in brief

A verifiable credential is a set of claims, such as a degree awarded or a certification earned, issued by an issuer about a subject and cryptographically secured so that tampering is detectable. The holder, often the subject, stores the credential, typically in a digital wallet, and presents it to a verifier, sometimes wrapped in a verifiable presentation. The verifier checks the proof, the issuer's identity, and the credential's status, such as whether it has been revoked.

What changed in version 2.0

According to the W3C specification, version 2.0 made several notable changes from version 1.1:

• New base context. Credentials reference a version 2.0 context that defines the core vocabulary.
• Validity fields. Properties named validFrom and validUntil express when a credential is valid, replacing the earlier issuance and expiration date properties.
• Securing mechanisms separated. The core data model no longer defines how credentials are signed. Companion specifications cover data integrity proofs and securing credentials with JOSE and COSE formats, giving implementers clearer, interoperable options.
• Media types. Specific media types were defined for credentials and presentations.
• Status and related specs. Mechanisms such as status lists for revocation are defined in related W3C specifications.

Implementers moving from 1.1 should review these changes in the specification itself.

Why it matters for hiring

Much of hiring verification is manual: calling universities, contacting former employers, checking certification databases. Verifiable credentials let issuers such as universities, training providers, and employers issue signed records that candidates hold and share. A verifier can check authenticity in seconds without contacting the issuer, and the candidate controls what is shared. A common standard means credentials from different issuers can be verified with the same tools.

Privacy and selective disclosure

Credentials can contain more information than a verifier needs. Some cryptographic approaches support selective disclosure, sharing only certain claims, or proving a fact, such as holding a qualification, without revealing everything else. Privacy-preserving designs matter for hiring, where data protection rules limit what employers may collect.

Verifiable credentials and onchain reputation

Verifiable credentials do not require a blockchain; they are signed data that can be stored anywhere. Blockchains may be used for registries of issuer keys or status information, and onchain records can complement credentials by showing completed, paid work. Both aim at the same hiring problem: replacing self-reported claims with records that others can verify.

How verification works in practice

A verifier receives a credential or presentation, checks the cryptographic proof against the issuer's public key, confirms the issuer is trusted for that type of claim, checks validity dates, and queries the status mechanism to confirm the credential has not been revoked or suspended. It may also check that the presenter is the holder, for example through a proof of control of a key. Each step relies on interoperable formats, which is what the standard provides.

For employers: first steps

Start by accepting credentials where issuers already provide them, such as some certification bodies and universities, using verification tools that support the W3C model. Define which issuers you trust for which claims. Consider issuing credentials yourself, for example employment verification letters, so former employees can prove their history without repeated requests to HR.

Adoption considerations

Value depends on issuers participating and verifiers accepting credentials. Adoption is growing in education, professional certification, and government identity programmes, but coverage is uneven. Organisations adopting credentials should choose interoperable formats, plan key management and revocation, and consider how candidates without credentials will be treated fairly.