Function verify 

pub(crate) async fn verify(
    wan: &WanIdentityStore,
    own_instance_id: &str,
    polled_agent_id: &str,
    row_source_agent: &str,
    row: &CarriedRow,
    message: &str,
    now: i64,
    dir: &Directory<'_>,
) -> WanVerdict

The §2.3 table, in order.