pub fn verify_signature_chains(
attestant_verifying_keys: &AttestantVerifyingKeys,
reachable_signed_keys: &[ReachableSignedKeys],
) -> Result<(), WireError>pub fn verify_signature_chains(
attestant_verifying_keys: &AttestantVerifyingKeys,
reachable_signed_keys: &[ReachableSignedKeys],
) -> Result<(), WireError>