# Supported standards

> The exchange protocols, credential formats, DID methods and platforms Credo supports.

Credo keeps exchange protocols and credential formats separate, so most formats work with more than one protocol. For which ones to start with, see [Choose your setup](https://credo.js.org/guides/getting-started.md#choose-your-setup).

## Credential formats and protocols

| Format | OpenID4VC OpenID4VCI | OpenID4VC OpenID4VP | OpenID4VC DC API | ISO mdoc Proximity | ISO mdoc DC API | DIDComm Issue Credential v2 | DIDComm Present Proof v2 |
| --- | --- | --- | --- | --- | --- | --- | --- |
| [SD-JWT VC](https://credo.js.org/guides/credential-formats/sd-jwt-vc.md) (`dc+sd-jwt`) | Yes | Yes | Yes | No | No | No | No |
| [mdoc](https://credo.js.org/guides/credential-formats/mdoc.md) (`ISO 18013-5`) | Yes | Yes | Yes | Yes (The BLE or NFC transport comes from a native module) | Yes (ISO/IEC 18013-7 Annex C) | No | No |
| [W3C VC 1.1, JWT](https://credo.js.org/guides/credential-formats/w3c-vc.md) (`jwt_vc_json`) | Yes | Yes | Yes | No | No | No | Yes (Through DIF Presentation Exchange) |
| [W3C VC 1.1, JSON-LD](https://credo.js.org/guides/credential-formats/w3c-vc.md) (`ldp_vc`) | Partly (Issuing between Credo agents needs workarounds) | Partly (Presenting with DCQL fails when Credo creates the presentation) | Partly (Presenting with DCQL fails when Credo creates the presentation) | No | No | Yes | Yes (Through DIF Presentation Exchange) |
| [W3C VC 2.0, SD-JWT](https://credo.js.org/guides/credential-formats/w3c-vc.md) (`vc+sd-jwt`) | Yes | Yes | Yes | No | No | Yes (Aries RFC 0881) | No |
| [W3C VC 2.0, Data Integrity](https://credo.js.org/guides/credential-formats/w3c-vc.md) (`eddsa-jcs-2022`) | No | No | No | No | No | Yes (The issuer doesn't verify the holder's binding proof) | No |
| [AnonCreds](https://credo.js.org/guides/credential-formats/anoncreds.md) (`CL signatures`) | No | No | No | No | No | Yes | Yes |

## OpenID for Verifiable Credentials

Package: `@credo-ts/openid4vc`. See [OpenID4VC](https://credo.js.org/guides/protocols/openid4vc.md).

| Specification | Versions | Roles |
| --- | --- | --- |
| [OpenID for Verifiable Credential Issuance](https://openid.net/specs/openid-4-verifiable-credential-issuance-1_0.html) | 1.0, drafts 11 to 15 | Issuer, holder |
| [OpenID for Verifiable Presentations](https://openid.net/specs/openid-4-verifiable-presentations-1_0.html) | 1.0, drafts 21 and 24 | Verifier, holder |
| [Digital Credentials Query Language](https://openid.net/specs/openid-4-verifiable-presentations-1_0.html#name-digital-credentials-query-l) (DCQL) | OpenID4VP 1.0 | Verifier, holder |
| [DIF Presentation Exchange](https://identity.foundation/presentation-exchange/spec/v2.0.0/) | 2.0, with OpenID4VP drafts only | Verifier, holder |
| [W3C Digital Credentials API](https://www.w3.org/TR/digital-credentials/) | OpenID4VP requests. For ISO 18013-7 requests, see [ISO mdoc](#iso-mdoc) | Verifier, holder |
| [OAuth 2.0 DPoP](https://www.rfc-editor.org/rfc/rfc9449), [PKCE](https://www.rfc-editor.org/rfc/rfc7636), [PAR](https://www.rfc-editor.org/rfc/rfc9126) | | Issuer, holder |
| [OAuth 2.0 Attestation-Based Client Authentication](https://datatracker.ietf.org/doc/draft-ietf-oauth-attestation-based-client-auth/) (wallet attestations) | | Issuer, holder |

## ISO mdoc

Package: `@credo-ts/core` (`agent.mdoc`). See [ISO mdoc](https://credo.js.org/guides/protocols/mdoc.md).

| Specification | Roles | Notes |
| --- | --- | --- |
| [ISO/IEC 18013-5](https://www.iso.org/standard/69084.html) proximity presentation | Holder, verifier | Credo creates and verifies the device response. The BLE or NFC transport comes from a native module such as `expo-mdoc-data-transfer`. Reader authentication and device MAC aren't supported. |
| [ISO/IEC TS 18013-7](https://www.iso.org/standard/91154.html) Annex C, over the [Digital Credentials API](https://www.w3.org/TR/digital-credentials/) | Verifier, holder | Signed requests with reader authentication are supported. Available since 0.7.1. |

## DIDComm

Package: `@credo-ts/didcomm`, with optional protocol packages. Credo implements DIDComm v1 messaging and the protocols below. See [DIDComm](https://credo.js.org/guides/protocols/didcomm.md).

| Protocol | Aries RFC | Package |
| --- | --- | --- |
| Out of Band 1.1 | [0434](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0434-outofband) | `@credo-ts/didcomm` |
| DID Exchange 1.1 | [0023](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0023-did-exchange) | `@credo-ts/didcomm` |
| DID Rotate 1.0 | [0794](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0794-did-rotate) | `@credo-ts/didcomm` |
| Issue Credential 2.0 | [0453](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0453-issue-credential-v2) | `@credo-ts/didcomm` |
| Present Proof 2.0 | [0454](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0454-present-proof-v2) | `@credo-ts/didcomm` |
| Coordinate Mediation 1.0 | [0211](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0211-route-coordination) | `@credo-ts/didcomm` |
| Message Pickup 1.0 and 2.0 | [0212](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0212-pickup), [0685](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0685-pickup-v2) | `@credo-ts/didcomm` |
| Discover Features 1.0 and 2.0 | [0031](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0031-discover-features), [0557](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0557-discover-features-v2) | `@credo-ts/didcomm` |
| Revocation Notification 1.0 and 2.0 | [0183](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0183-revocation-notification), [0721](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0721-revocation-notification-v2) | `@credo-ts/didcomm` |
| Basic Message 1.0 | [0095](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0095-basic-message) | `@credo-ts/didcomm` |
| Action Menu 1.0 | [0509](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0509-action-menu) | `@credo-ts/action-menu` |
| Question Answer 1.0 | [0113](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0113-question-answer) | `@credo-ts/question-answer` |
| DIDComm RPC 1.0 | [0804](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0804-didcomm-rpc) | `@credo-ts/drpc` |

The DIDComm v1 protocols Connections 1.0 ([0160](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0160-connection-protocol)), Issue Credential 1.0 ([0036](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0036-issue-credential)) and Present Proof 1.0 ([0037](https://github.com/decentralized-identity/aries-rfcs/tree/main/features/0037-present-proof)) are still available, but deprecated and removed in 0.8.

## DID methods

See [DIDs](https://credo.js.org/guides/dids-and-trust.md).

| Method | Package |
| --- | --- |
| `did:key`, `did:jwk`, `did:peer`, `did:web` | `@credo-ts/core` |
| `did:webvh` | `@credo-ts/webvh` |
| `did:cheqd` | `@credo-ts/cheqd` |
| `did:indy`, `did:sov` | `@credo-ts/indy-vdr` |
| `did:hedera` | `@credo-ts/hedera` |

## Platforms and infrastructure

| | Supported |
| --- | --- |
| Runtimes | Node.js 20.19 or later (22 or later recommended), React Native (Expo) |
| Storage | [Askar](https://credo.js.org/guides/agent-setup/storage/askar.md) (SQLite, PostgreSQL), [Drizzle](https://credo.js.org/guides/agent-setup/storage/drizzle.md) (PostgreSQL, SQLite) |
| Key management | [Askar, Node.js crypto, iOS Secure Enclave and Android Keystore](https://credo.js.org/guides/agent-setup/key-management.md) |
| Caching | [In memory, storage, Redis](https://credo.js.org/guides/agent-setup/caching.md) |
| Multi-tenancy | [`@credo-ts/tenants`](https://credo.js.org/guides/agent-setup/multi-tenancy.md) |