Credential proof nonce is short-lived and single-use

Requirement as recorded in the ProtocolSoup registry

A credential proof nonce is short-lived and single-use, including when two Credential Requests attempt to consume it concurrently.

Self-test verdict

Tests

• TestCredentialNonceConsumptionIsAtomic

  ./internal/protocols/oid4vci

  Pass

Implementation

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

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