#Concepts

Learn more about the general building blocks of decentralized ID solutions.

• Decentralised Identity - An introduction to decentralized identity.
• ID Ecosystems - The role of ecosystems in decentralized ID solutions.
• Decentralised Identifiers (DIDs) - The role of DIDs and how they work.

#Digital Credentials

Learn more about the different types of digital credentials

• Verifiable Credentials (W3C) - The W3C data model for tamper-evident digital credentials.
• mDL / mdoc credentials - ISO/IEC 18013 mobile driver's license and mdoc credential format.
• SD-JWT VC credentials - JWT-based credentials with selective disclosure for claim-level privacy.
• Mono claim credentials - Single-attribute credentials for minimal disclosure and simple verification.

#Credential Exchange Protocols

• OpenID4VCI (Issuance) - Protocol for issuing verifiable credentials to wallets.
• OpenID4VP (Presentation) - Protocol for presenting credentials from a wallet to a verifier.
• Digital Credentials API (Browser-Based) - W3C browser API that mediates credential presentation and issuance natively in the browser also known as DC API.
• HAIP (High Assurance Profile) - Security-hardened profile of OpenID4VCI and OpenID4VP for high-assurance interoperability. Required by eIDAS 2.

#Trust Systems

• EU Trust Lists - Machine-readable registries of trusted entities for the EU digital identity ecosystem (eIDAS 2.0).
• ISO mDL Trust / VICALs - Certificate authority hierarchies for verifying ISO mobile document issuers.
• Wallet Attestations - Cryptographic proofs that establish the authenticity and integrity of digital wallets.

#Credential Lifecycle

• Credential lifecycle - How to manage the status (e.g. revocation) of credentials.