Hyperledger Identus is an open-source toolkit for building decentralized identity applications—not a single wallet or ledger product. A typical workflow brings together an issuer agent, a holder wallet, a verifier agent and, when the messaging setup requires it, a mediator. You can use the documented quick-start path to create DIDs and credential schemas, issue a credential, then request and verify a presentation. The key design decision is to confirm support for your exact component, protocol and credential-format combination before you commit to a production flow.
What Hyperledger Identus provides
Identus is a collection of interoperating software components for decentralized identity workflows. Its developer documentation describes cloud agents, wallet SDKs and modular functions for cryptography, DID operations, credentials and messaging. The project site and developer documentation are the starting points for understanding the project and building applications.
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The named modules divide core responsibilities: Apollo provides cryptographic primitives, Castor handles DID operations, Pollux provides verifiable credential functions, and Mercury supports DIDComm messaging. The Cloud Agent API covers DID management, credential issuance and verification, DIDComm messaging, connections and multi-tenancy. Wallet SDK references are available for TypeScript, Swift and Kotlin Multiplatform.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesThink in terms of the roles your application must connect, rather than treating Identus as one deployable product:
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- Issuer: creates and issues a credential asserting information about a holder.
- Holder: keeps the credential in a wallet and presents relevant information when asked.
- Verifier: requests a presentation and checks it against the verification requirements.
- Mediator: can support delivery of DIDComm messages between participants.
How to build a first end-to-end flow
The documented quick-start sequence provides a useful development exercise. It connects the main roles and artifacts without implying that a particular setup is ready for production.
- Define the use case and roles. Decide what an issuer needs to assert, what the holder should retain, and what the verifier needs to learn. Keep the requested information limited to what the use case requires.
- Choose the wallet SDK and deployment shape. Select among the documented TypeScript, Swift and Kotlin Multiplatform wallet SDKs according to your application stack. Plan which Cloud Agent capabilities you need. Do not assume that every SDK and agent supports every feature equally.
- Deploy issuer and verifier agents. Follow the Identus developer documentation to bring up the agents for the development flow.
- Set up the wallet SDK and mediator. Connect the wallet and deploy and connect to a mediator where the flow calls for one.
- Create identity and credential artifacts. Create DIDs and credential schemas for the chosen flow.
- Issue, present and verify. Issue a credential to the holder, request a presentation, and verify the resulting presentation through the verifier agent.
This exercise validates that the participants and protocol steps fit together. It does not by itself establish the security, availability or operational suitability of a production deployment.
Choose DID methods, formats and protocols for the flow
Identus documentation lists multiple standards and approaches, including W3C DID Core 1.0, PRISM DID, Peer DID, W3C credential formats, AnonCreds, SD-JWT, DIDComm Messaging v2, OID4VCI, OID4VP, W3C Bitstring Status List and DIF Presentation Exchange. That overview is an index of documented technologies, not evidence that every version, workflow or product component interoperates in the same way.
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DID method and registry fit
The reference documentation describes PRISM DID as a Cardano-based decentralized identifier method. That does not mean every Identus deployment must use PRISM or Cardano. Select a DID method and verifiable data registry based on the use case and counterparties, then confirm how the chosen agents create, publish and resolve the identifiers and related artifacts. The reference docs provide component-level detail.
Credential privacy and disclosure
AnonCreds is an option to evaluate when data minimization and selective disclosure matter. Its specification describes using AnonCreds objects with different verifiable data registries rather than tying them to one ledger implementation. It also describes the AnonCreds v1.0 revocation mechanism using an accumulator. The AnonCreds specification labels v1.0 as a draft, so check its current status and the exact Identus method and workflow you need before relying on version-specific behavior.
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Interoperability is a flow-level decision
For a proposed flow, confirm that the issuer agent, wallet SDK, verifier agent and any external counterparties support the required combination—for example, DIDComm or an OpenID4VC flow, the presentation-exchange behavior you need, and the selected credential format. The relevant question is not simply whether Identus lists a protocol, but whether the exact components at both ends support the required exchange.
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A working development exchange is only one part of adopting identity software. Review the operational requirements called out in the developer and reference materials, and validate them against your own architecture.
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- Authentication: determine how Cloud Agent access and application-to-agent requests will be authenticated.
- Secret storage: decide how keys and other secrets are protected in the agent and wallet environments.
- VDR configuration: validate the registry setup and resolution behavior for your chosen DID and credential approach.
- Multi-tenancy: establish whether the Cloud Agent’s multi-tenant capabilities fit your isolation and administration needs.
- Failure handling: review troubleshooting guidance and test the errors and recovery paths your application must handle.
- Support status: recheck the specifications matrix for changes to the precise component and protocol pair before adopting or upgrading it.
The documentation identifies these as areas to plan for, but it does not establish one universal deployment configuration or a blanket security guarantee. Your security model and production controls must be assessed for the deployment you build.
A practical decision framework
Before choosing a DID or credential approach, answer these questions for the actual participants and exchange:
- Disclosure: which claims must the verifier learn, and do you require selective disclosure or other data-minimization properties?
- Interoperability: which messaging or OpenID4VC flow do your agents, wallets and counterparties support together?
- Registry and method: how will identifiers and credential-related artifacts be published and resolved for the selected method?
- Implementation status: does the matrix list the exact component/specification combination as supported, qualified, partial, outdated or in progress?
- Operations: can your deployment meet its authentication, secret-storage, tenancy and troubleshooting requirements?
Answering these at the workflow level avoids choosing a format or method based only on a standards list. The specifications matrix, reference docs and developer docs are the relevant official references to consult as you make those choices.
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