Callback required for JWT signature verification.
OptionalfetchOptional callback used to fetch and evaluate revocation status from the
status list referenced in payload.status.status_list.
If omitted, revocation is not checked by this function.
The compact key attestation JWT (key-attestation+jwt) to verify.
OptionalnowCurrent time override. If not provided, the current time is used.
Options for verifying a key attestation JWT.