Presentation Exchange is a specification that defines a declarative JSON-based format for verifiers to articulate the exact proof requirements a holder must satisfy to access a protected resource. It standardizes how a verifier describes the specific Verifiable Credentials and attributes needed, enabling interoperable, automated negotiation between a holder's Digital Identity Wallet and a verifier's access control system without custom integration code.
Glossary
Presentation Exchange
A specification defining a declarative JSON-based format for verifiers to describe the proof requirements needed from a holder to gain access to a resource.
DECLARATIVE PROOF REQUIREMENTS
What is Presentation Exchange?
A specification defining a declarative JSON-based format for verifiers to describe the proof requirements needed from a holder to gain access to a resource.
The specification works in tandem with protocols like OpenID for Verifiable Credentials (OID4VC) and DIDComm Messaging, structuring a presentation_definition object that specifies input descriptors, constraints, and submission requirements. This allows a holder to filter their credentials and construct a compliant Verifiable Presentation containing only the necessary claims, supporting Selective Disclosure and minimizing data exposure during authentication.
PROTOCOL MECHANICS
Key Features of Presentation Exchange
The Presentation Exchange specification defines a declarative, JSON-based format that enables verifiers to articulate complex proof requirements, allowing holders to assemble compliant Verifiable Presentations without manual intervention.
01
Presentation Definition Object
The core structural element where a verifier specifies input descriptors detailing exactly which credentials are acceptable. This JSON schema defines constraints on credential types, issuer DIDs, and schema patterns. A single definition can request multiple credentials simultaneously, enabling complex composite proof requests for enterprise access control scenarios.
02
Input Evaluation Protocol
A deterministic matching algorithm processes the verifier's definition against a holder's wallet contents. The protocol evaluates field constraints using JSONPath queries and filtering rules to select credentials that satisfy the criteria. This automated selection eliminates manual credential picking, enabling seamless, privacy-preserving interactions where only the minimum required data is disclosed.
03
Submission Requirement Rules
Defines complex combinatorial logic for multi-credential requests using operators like all, pick, and count. This allows verifiers to specify nuanced policies such as:
all
Require every credential
pick
Require N of M options
04
Format and Envelope Agnosticism
The specification operates independently of the underlying credential format. It supports W3C Verifiable Credentials, AnonCreds, and ISO mDL formats through a pluggable design. The transport layer is similarly decoupled, functioning over DIDComm, OID4VP, or REST APIs, ensuring interoperability across the decentralized identity stack.
05
Embedded Zero-Knowledge Constraints
Verifiers can request predicate proofs rather than raw data values. Using ZKP-compatible formats like BBS+ Signatures, a definition can demand proof that an attribute is greater than a threshold without revealing the exact value. This enables age verification or credit score checks with mathematical privacy guarantees.
06
Challenge-Response Binding
To prevent replay attacks, the specification integrates a nonce and domain binding mechanism. The verifier injects a cryptographic challenge into the definition, which the holder must sign over in the resulting Verifiable Presentation. This cryptographically binds the proof to a specific transaction and audience, neutralizing man-in-the-middle threats.
PRESENTATION EXCHANGE
Frequently Asked Questions
Clear, technical answers to the most common questions about the Presentation Exchange specification, its mechanics, and its role in sovereign identity architectures.
Presentation Exchange (PEX) is a declarative, JSON-based specification that standardizes how a verifier describes the proof requirements a holder must satisfy to gain access to a protected resource. It functions as a universal filtering and matching language for Verifiable Credentials (VCs). In practice, a verifier creates a presentation_definition object that articulates the required credentials, specific claims, and acceptable formats (such as JWT-VC or AnonCreds). The holder's wallet then evaluates this definition against its stored credentials and assembles a Verifiable Presentation containing only the necessary proofs. This mechanism decouples the verifier's business logic from the holder's credential storage, enabling interoperability across different identity frameworks, including Self-Sovereign Identity (SSI) and OpenID for Verifiable Credentials (OID4VC). The core workflow involves three steps: definition, submission, and evaluation, ensuring that data minimization is enforced by design, as holders never over-share information beyond what the definition explicitly requests.
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About the author
Prasad Kumkar
CEO & MD, Inference Systems
Prasad Kumkar is the CEO & MD of Inference Systems and writes about AI systems architecture, LLM infrastructure, model serving, evaluation, and production deployment. Over 5+ years, he has worked across computer vision models, L5 autonomous vehicle systems, and LLM research, with a focus on taking complex AI ideas into real-world engineering systems.
His work and writing cover AI systems, large language models, AI agents, multimodal systems, autonomous systems, inference optimization, RAG, evaluation, and production AI engineering.
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