This indicates which X.509 format version, v1, v2, or v3, a trusted peer or CA certificate entry uses, defaulting to x509v1. As with locally installed certificates, older v1 trusted certificates lack the extensions that v3 certificates use for constraints like key usage, which can affect how strictly the trust relationship is enforced. For example, an admin importing a CA's root certificate into the trust store would check trustedCertificateVersion to confirm it's a modern v3 certificate supporting proper CA constraints.