Hyperledger AnonCreds is an open-source approach to verifiable credentials that can let someone prove selected facts without revealing every detail in a credential. It supports selective disclosure, proofs such as “over 18,” and presentations drawing on multiple credentials. “Everywhere” is a design direction, not a guarantee: systems still need compatible proof methods, formats, trust policies, and status checks.
What is AnonCreds?
AnonCreds is a credential implementation associated originally with Hyperledger Indy and now maintained as the Hyperledger AnonCreds project. An issuer makes claims about a person or other subject, packages them in a credential, and gives that credential to a holder. The holder can later create a presentation that proves selected information to a verifier.
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The defining feature is that a presentation need not disclose every credential field. Depending on the proof request and implementation, a holder can reveal chosen attributes, prove a condition about an attribute, or combine evidence from more than one credential. The Hyperledger AnonCreds project describes version 1 as based on CL signatures and version 2 as designed to allow different signature schemes.
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The credential lifecycle has three roles. The issuer asserts claims; the holder controls credentials and creates a presentation; the verifier checks that presentation and decides whether to rely on it.
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- Issuance: An issuer creates a credential containing claims about a subject and delivers it to the holder.
- Request: A verifier asks for particular information or proof of a condition, rather than necessarily asking for the entire credential.
- Presentation: The holder uses one or more credentials to disclose selected attributes or prove a predicate. A presentation may demonstrate that an attribute meets a threshold without showing the underlying value.
- Verification and decision: The verifier checks the presentation’s cryptographic proof and relevant credential status, then applies its own trust requirements and business rules.
Zero-knowledge proofs are the cryptographic means for demonstrating that a statement is supported by credential data without exposing all of that data. The exact information disclosed depends on the request and presentation; the term does not mean that a verifier learns nothing.
Can I prove I’m over 18 without sharing my birth date?
That is a representative predicate proof. If an issuer has given you a credential containing your date of birth, an AnonCreds presentation can be constructed to prove that the date satisfies an age-threshold condition while withholding the birth date itself. The verifier receives evidence for the requested condition, not necessarily the date used to derive it.
This example depends on the credential, proof request, and implementation supporting the relevant attribute and predicate. It also does not establish that the issuer was entitled to make the claim or that the verifier should accept it. A verifier must decide whether it trusts the issuer and whether the credential and proof meet its policy.
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AnonCreds proof mechanisms support selective disclosure, predicate proofs, presentations assembled from multiple credentials, and proof that a credential has not been revoked without disclosing correlatable revocation identifiers. These are cryptographic capabilities, not a complete privacy guarantee for a deployment.
- Data minimization: A verifier can request only an attribute or condition needed for its decision instead of the full credential.
- Reduced linkability: Proof designs can avoid exposing identifiers that would let a verifier correlate presentations. Other data or system behavior may still make presentations linkable.
- Status checking: A verifier may check whether a credential remains valid without receiving the holder’s correlatable revocation identifier.
- Operational exposure: Issuer governance, key protection, wallet security, verifier behavior, and the details of status and correlation analysis still matter. A proof protocol cannot by itself prevent an organization from requesting excessive data or misusing information it receives.
Verifying a cryptographic proof is also not the same as proving that every claim is true. The W3C model describes verification and the subsequent decision to rely on claims as separate matters: verifiers consider the issuer, proof, subject, claims, and their own policies. See the W3C Verifiable Credentials Data Model 2.0.
Does AnonCreds require Hyperledger Indy?
Not as a general design requirement. The AnonCreds v1.0 specification is labeled a draft proposal and states a goal of removing AnonCreds’ dependency on the Hyperledger Indy ledger. AnonCreds originated in the Indy ecosystem, but the specification’s direction is ledger-agnostic.
There is an important distinction between the format or proof method and the ecosystem used to publish or resolve related information. Issuers, holders, and verifiers still need compatible implementations and a way to obtain the keys, schemas, and status information required by their chosen deployment. The AnonCreds Methods Registry marks the legacy Indy method deprecated and recommends did:indy for Indy issuers wherever possible. That recommendation concerns the method used in an Indy context; it does not make Indy a universal prerequisite for AnonCreds.
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How does AnonCreds fit with W3C Verifiable Credentials?
They describe different layers. W3C Verifiable Credentials Data Model 2.0 defines a broad data model and roles for credentials; it does not require one particular cryptographic proof system. AnonCreds is an implementation and proof approach that can be used in credential ecosystems. A credential being described as a W3C Verifiable Credential does not, on its own, mean it uses AnonCreds or supports AnonCreds-style selective disclosure.
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| Item | What it covers | Status stated by the source |
|---|---|---|
| W3C Verifiable Credentials Data Model 2.0 | Credential data model and roles; not a mandate to use AnonCreds. | W3C Recommendation published 15 May 2025. W3C announcement |
| AnonCreds v1.0 specification | AnonCreds v1, based on CL signatures, with a stated goal of removing Indy-ledger dependency. | Draft proposal. Specification |
| AnonCreds v2 | Project direction allowing different signature schemes; the repository also mentions work on a more scalable revocation scheme. | The repository says v2 has been started; this is not evidence of a finalized v2 standard or general deployment. Specification v2 page |
Consequently, interoperability is not automatic just because two systems use verifiable credentials. They need compatible proof methods and formats, suitable issuer and verifier implementations, a shared approach to trust, and workable credential-status mechanisms. W3C’s 2025 announcement called the VC 2.0 Recommendation a signal for building interoperable and privacy-aware standards, not proof that every credential ecosystem already interoperates.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What does deployment history establish?
ETSI Technical Report TR 119 476-1 V1.3.1, dated 2025-08, reports that AnonCreds had been in use since 2017 and names the Government of British Columbia, IDunion, and IATA Travel Pass as examples. ETSI describes the earlier stack as combining Aries protocols, Indy credentials, and the Ursa SDK, with features merged into the AnonCreds project since 2022. These are examples and historical context reported by ETSI, not a current audit of whether each named deployment remains operational. Read ETSI TR 119 476-1 V1.3.1.
What should an organization check before adopting AnonCreds?
Assess the complete credential system, not only its proof mechanism. The answers determine whether a privacy-preserving presentation can work across the parties that need to issue, hold, and verify credentials.
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- Disclosure: Can the implementation prove the specific predicates and selectively reveal the attributes your use case requires?
- Correlation: What information could let an issuer, verifier, or other party link presentations across transactions?
- Cryptography: Which AnonCreds version, signature scheme, and implementation will be deployed, and what security review applies to that combination?
- Status: How are revocation and other status checks performed, and what metadata do those checks expose?
- Infrastructure: Which registries or ledgers, if any, are required for the deployment, and how will participants resolve the necessary data?
- Interoperability: Do the actual wallets, issuer services, and verifier software support the same methods, formats, and status mechanisms?
- Trust and governance: Who may issue credentials, how are issuers vetted, and what rules determine whether a verifier accepts their claims?
- Operations: How will organizations protect issuer keys, secure wallets, handle updates, and respond to compromised credentials or systems?
These checks separate AnonCreds’ cryptographic capabilities from the organizational and technical conditions needed to use them safely. Project specifications and registry entries can change, so consult the current project repository, v1 specification, and methods registry when evaluating a deployment.
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