Nonce endpoint offered when c_nonce is required in proofs

Requirement as recorded in the ProtocolSoup registry

A Credential Issuer that requires c_nonce values to be incorporated into proofs in the Credential Request MUST offer a Nonce Endpoint.

Self-test verdict

Tests

• TestCredentialIssuerMetadataWellKnown

  ./internal/protocols/oid4vci

  Pass

Implementation

• backend/internal/protocols/oid4vci/handlers.go
• backend/internal/protocols/oid4vci/plugin.go

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