#About Verifier

The Verifier validates digital credentials and presentations against configurable policies, ensuring cryptographic integrity, temporal validity, and issuer compliance. It provides a critical trust layer for verification workflows in the Vidos ecosystem.

#Why use a Verifier?

The Verifier automates complex credential validation, providing:

• Configurable validation against organizational policies
• Standards compliance across multiple credential formats
• Comprehensive verification from cryptographic proofs to temporal constraints
• Standardized results for clear trust decisions

This enables applications to make informed trust decisions without implementing complex cryptographic validation logic.

#What is a Verifier?

A verifier validates digital credentials and presentations, returning detailed results that indicate whether credentials meet defined trust requirements.

The Verifier performs policy checks including:

• Proof verification - Validates digital signatures and cryptographic proofs
• Format validation - Ensures compliance with expected standards
• Temporal checks - Verifies validity periods
• Status verification - Checks revocation status
• Schema validation - Validates conformance to defined schemas

#Verifier Architecture

The Verifier has two main components:

1. Verifier Service: Core verification engine with configurable policies
2. Verifier Management Service: Configuration and instance management

Multiple verifier instances can be created, each with specific policy configurations for different verification requirements.

The Verifier integrates with other Vidos services:

• Resolver - Retrieves cryptographic material for verification
• Validator - Performs schema validation
• Authorizer - Receives verification results for access control

#Verification Process

The Verifier performs sequential policy checks:

1. Format validation - Confirms expected data structure
2. Proof verification - Validates digital signatures and cryptographic proofs
3. Temporal verification - Checks validity periods
4. Status verification - Ensures no revocation
5. Schema validation - Verifies adherence to defined schemas
6. Additional policies - Applies custom verification rules

Each check can be individually configured or disabled based on requirements.

#Use Cases

The Verifier supports various verification scenarios:

• Credential validation - Verify authenticity and validity
• Access control - Support authorization decisions
• Compliance verification - Ensure regulatory requirements
• Trust chain validation - Validate nested credential structures
• Multi-format verification - Support different formats through unified interface

Configurable policies enable customized trust decisions based on organizational requirements.

#Summary

The Verifier is a critical Vidos service that:

• Validates integrity and authenticity of digital credentials
• Applies configurable policies for diverse trust requirements
• Provides structured verification results for trust decisions
• Integrates with other Vidos services for comprehensive solutions
• Supports multiple credential formats through unified interface

The Verifier simplifies implementation of trusted digital interactions across applications and services.