The weakest link in transit title is the gap when cargo arrives but the document has not and the customs entry is still open. SNSUC's digital warehouse receipt splits title into three states — in-warehouse, in-transit, delivered — and every state change is SHA-256 timestamped on chain. We now wire that state machine directly into the customs single window.

The effect flips declaration from a person chasing the vessel schedule to a system that files on state change. The moment a receipt flips from in-transit to delivered, the system auto-fills the duty elements into a declaration draft using the filed formula price; customs brokers only review, instead of keying each cargo's differential, quality and quantity by hand.

This hits transit working capital most directly. A cargo under STS transshipment used to take 7–11 days from anchorage to refinery tank farm, with declaration, duty payment and release handed off by email and spreadsheets. With state linkage the in-transit funding cycle drops below 7 days, and stacked with two-step declaration and consolidated duty payment it tightens turnover further.

Underneath stays light-node verification: the browser computes SHA-256 locally and never holds the private key. Customs and banks see a title state that matches the on-chain hash, so double pledging and one-cargo-many-sales are blocked at the source.