The trust cost of a digital warehouse receipt used to hide in the back-and-forth between bank counters and third-party inspection. SNSUC now computes the receipt fingerprint in the browser: the title holder hashes the bill of lading, the inspection report and the delivery note locally with SHA-256, and the 256-bit digest goes on-chain without leaving the client machine. The fingerprint never touches our servers or any intermediary node, so the holder keeps control of the source documents at all times.

ESG carbon footprint runs on a separate track. For each transshipped crude parcel, from load port to STS anchorage, we accumulate bunker consumption against emission factors per leg and produce a traceable carbon ledger, also committed on-chain as a hash. When a buyer files ESG disclosure, it pulls that ledger directly for verification instead of writing to us for paper proof.

In deployment the receipt and the carbon ledger share one on-chain interface but split permissions: title transfer needs a three-party signature — shipper, ship agent, consignee — while the carbon ledger is read-only to auditors. One document supports both trade settlement and compliance disclosure, with the two evidence chains kept independent.