Class that represents a Verifier identity from the verifier's perspective.
Verifier can have multiple identities and use a subset of them to sign verification requests.
the client ID, e.g. x509_san_dns:verifier.multipaz.org or null; it is only used in OpenID4VP context.
x509_san_dns:verifier.multipaz.org
null
X509-certified key used to sign verification requests