The system described here is a bolt-type seal lock which includes a bolt, having a shaft with proximal and distal portions and a head that is wider than the distal portion of the shaft and located at the proximal portion of the shaft; a locking body having a passageway with an open end for receiving and retaining the distal portion of the shaft of the bolt in locking engagement after the shaft has been inserted a predetermined extent into the open end of the passageway, at which point the shaft cannot be withdrawn from the open end of the passageway; and a housing connected to, and rotatable relative to, the locking body, configured to be removably mounted to a door of a shipping container, thereby preventing swinging motion of the locking body. The housing contains electronics, including memory, a wireless communication component, and a power source.