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AnonCreds lets a credential holder prove selected facts without necessarily revealing every claim in the credential. Its zero-knowledge proof capabilities include selective disclosure, predicate proofs such as proving an age threshold, and combining information from multiple credentials. “Everywhere,” however, is a direction—not a guarantee: systems still need compatible proof methods, formats, trust policies, and status checks.
What is AnonCreds?
AnonCreds is an open-source approach to verifiable credentials associated first with Hyperledger Indy and now developed as the Hyperledger AnonCreds project. A credential is an issuer’s digitally verifiable set of claims about a subject—for example, that a person has a particular qualification or meets an eligibility condition. AnonCreds provides ways for a holder to prove selected information about a credential while disclosing less than the full credential.
The project describes AnonCreds v1 as based on Camenisch–Lysyanskaya (CL) signatures. Its repository describes v2 as flexible enough to support different signature schemes. Those are different stages of the project, not evidence that every AnonCreds deployment uses multiple signature schemes today. See the Hyperledger AnonCreds project and the AnonCreds v1 specification.
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How do zero-knowledge verifiable credentials work?
A zero-knowledge proof allows a holder to demonstrate that a statement is true under the credential’s cryptographic rules without disclosing all the underlying information used to establish it. In a typical credential exchange, the roles are:
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- Issuer: asserts claims about a subject, creates a credential, and gives it to the holder.
- Holder: stores one or more credentials and responds to a verifier’s request with a verifiable presentation. The holder can disclose selected attributes or prove an allowed condition without sending every credential field.
- Verifier: checks the presentation’s proof and relevant credential status, then applies its own rules to decide whether to accept the claims.
AnonCreds supports selective disclosure, predicate proofs, presentations constructed from multiple credentials, and proofs that a credential has not been revoked without revealing correlatable revocation identifiers. These are cryptographic capabilities; how much privacy a real exchange provides also depends on wallet behavior, verifier requests, status infrastructure, and deployment choices. The v1 specification and project repository describe the mechanisms.
Can I prove I’m over 18 without sharing my birth date?
That is the kind of predicate proof AnonCreds is designed to support. If an issuer gave you a credential containing your birth date, a verifier could request proof that the date meets an age threshold rather than asking to see the date itself. The presentation can prove the requested condition without disclosing the underlying birth date, provided the credential, proof method, wallet, and verifier support that flow.
This does not make the exchange anonymous in every respect. A verifier may request other identifying details, and the surrounding system may create linkability through account records, network metadata, repeated requests, or status checks. A proof also establishes only what its credential and cryptographic rules support; it does not independently establish that the issuer’s original claim was accurate.
Does AnonCreds require Hyperledger Indy?
No—not as a design requirement of the AnonCreds v1 draft specification. The specification’s stated goal is to remove AnonCreds’ dependency on the Hyperledger Indy ledger. AnonCreds originated in the Indy ecosystem, but the credential proof approach and the ledger or registry used by an implementation are separate architectural choices.
The AnonCreds Methods Registry marks the legacy Indy method as deprecated and recommends did:indy for Indy issuers wherever possible. That recommendation concerns method selection for Indy issuers; it does not mean AnonCreds requires a particular ledger in all deployments. Check the AnonCreds Methods Registry for its method guidance.
How does AnonCreds fit with W3C Verifiable Credentials?
They address related but distinct layers. The W3C Verifiable Credentials Data Model defines a broad model for credentials and the roles involved. AnonCreds is a credential implementation and proof approach. A credential system using the W3C data model does not thereby use AnonCreds, and AnonCreds-specific proof capabilities do not automatically make every W3C credential interoperable with every AnonCreds implementation.
| Layer | What it addresses | Status stated in the cited source |
|---|---|---|
| W3C Verifiable Credentials Data Model 2.0 | A general data model for verifiable credentials and their roles; it is not a single cryptographic proof system. | W3C Recommendation published 15 May 2025. |
| AnonCreds v1.0 specification | An AnonCreds credential and proof approach, with a stated aim of removing dependency on the Indy ledger. | The specification page labels it a draft proposal. |
| AnonCreds v2 | A project direction described as allowing alternative signature schemes and a more scalable revocation scheme. | The repository says v2 has been started; this does not establish a final v2 standard or general deployment. |
These distinctions matter when planning interoperability: shared data-model concepts do not by themselves align proof formats, cryptographic suites, credential schemas, status mechanisms, or trust rules. The W3C VC Data Model 2.0 Recommendation, the AnonCreds v1 specification, and the AnonCreds v2 specification page describe their respective layers and statuses.
What does a valid proof establish—and what does it not establish?
A successful cryptographic check is not a guarantee that every claim should be trusted. The verifier still has to evaluate the issuer, the proof, the subject and claims, and its own rules for accepting them. A credential might be mathematically valid yet come from an issuer the verifier does not recognize, make a claim unsuitable for the verifier’s purpose, or fail a policy requirement.
- Issuer governance: who is allowed to issue a credential and how that authority is assessed.
- Key and wallet security: whether issuer keys are protected and holders can securely store and use credentials.
- Verifier policy: which issuers, claims, proof methods, and levels of assurance the verifier accepts.
- Status and correlation: how revocation or other status information is checked, and whether repeated interactions can be linked.
- Implementation security: whether the actual software and deployment correctly implement the intended cryptographic behavior.
The W3C recommendation explains that verifiers evaluate the issuer, proof, subject, claims, and their own policies before relying on claims. Read the W3C Verifiable Credentials Data Model 2.0 for that distinction.
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Where has AnonCreds been used?
ETSI TR 119 476-1 V1.3.1, published in August 2025, reports that AnonCreds had been in use since 2017 and names the Government of British Columbia, IDunion, and IATA Travel Pass as examples. This is a dated report of example use, not a live audit confirming that each deployment remains operational in 2026.
The same ETSI report describes the earlier stack as combining Aries protocols, Indy credentials, and the Ursa SDK, and says features had been merged into the AnonCreds project since 2022. See ETSI TR 119 476-1 V1.3.1 (2025-08).
What should an organization check before adopting AnonCreds?
“Works everywhere” is not a useful acceptance criterion. Evaluate the entire credential exchange and its governance, not just whether a proof can be generated.
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- Disclosure needs: confirm that the proof method supports the selective attributes and predicates your use case actually requires.
- Correlation risk: assess whether presentations, identifiers, wallet behavior, or status checks can be linked across transactions.
- Cryptographic compatibility: agree on signature schemes, proof formats, and supported versions between issuer, holder wallet, and verifier.
- Credential status: determine how revocation or other validity changes are represented and checked, including any privacy effects.
- Infrastructure assumptions: identify whether the deployment relies on a ledger, registry, or other service, and who operates it.
- Trust framework: define which issuers are trusted, which claims count as evidence, and what a verifier must do when checks fail.
- Implementation readiness: review wallet and verifier support, integration requirements, security assessments, and operational responsibilities.
For time-sensitive implementation choices, consult the current AnonCreds specification, v2 specification page, and methods registry; their version and method status can change.
Can AnonCreds make verifiable credentials work everywhere?
AnonCreds offers a way to reduce unnecessary disclosure in credential presentations, including proving selected facts without revealing the full source data. It cannot by itself deliver universal interoperability or trust. That depends on compatible implementations and methods, shared expectations for credential status, secure wallets and services, and governance that tells verifiers which issuers and claims to accept. Treat “everywhere” as an interoperability goal to design toward, not a property guaranteed by the cryptography.
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