SNSUC's digital warehouse receipt builds its trust anchor in the browser. Once the title holder uploads the receipt PDF and ownership documents, the front end runs a 256-bit SHA-256 digest via Web Crypto and chains the digest alongside the receipt. A buyer need not trust SNSUC's middleware; they only check whether the on-chain hash matches a hash recomputed locally — that step swaps trust-in-people for trust-in-math.

A 256-bit digest pushes collision odds to the order of 2 to the 128, enough to cover a receipt's full lifecycle against forgery. Once chained, title transfer no longer relies on paper endorsement; the on-chain record is the proof of ownership. SNSUC puts this step in the browser rather than the server so the title holder gets an independently verifiable credential the moment they upload.

ESG carbon footprint runs on a parallel track. From load port to STS transshipment to onshore delivery, every leg of sea freight, transshipment and storage emits; SNSUC writes each batch's carbon footprint into the same on-chain credential, so a member reading the receipt also sees that parcel's emission caliber. Carbon data off-chain is just a claim; on-chain it can be audited by a third party.