At the loading terminal the carrier (or terminal as its agent) inspects and records the seal before loading; Customs requiring advance information approves loading or issues do-not-load messages, which the carrier observes; where export declarations and screening apply, the carrier requires evidence of shipper compliance before loading, and the ocean carrier files manifest data with importing Customs that require it.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.