When we block a transaction, our system does not process the sale at all, so it won't show up in your E-junkie Transaction Log, which only lists orders we have successfully processed. Note this does not block them from completing checkout for an order, as we have no way of knowing who the buyer is, and thus cannot block them, until after they have already completed checkout. If you can find their original order which led you to block them, among that transaction's details you can find what their IP address was at that time; however, IP addresses are not permanently assigned to any particular individual or computer, so that would probably be useless for blocking future orders, which is why we do not support blocking transactions by IP address.
