A digital warehouse receipt has two worst enemies: unclear title and no trail of custody. SNSUC now hashes the receipt's key fields — product, quantity, warehouse operator, freeze status, receipt number — with SHA-256 directly in the browser and anchors the digest on a blockchain. The whole computation stays client-side; private keys never touch the network, so a server breach cannot leak the receipt fingerprints in bulk.

On the title side, the on-chain hash timestamps who held which batch at which moment. A paper receipt waits on the warehouse stamp, fax and bank check — two or three days in a cross-border transshipment; on-chain, the buyer clicks once and gets a verifiable proof of holding, pulling title transfer from T+2 to near real time.

The ESG side comes along for free: the same hash also carries the batch's carbon-footprint data — load port, transport mode, CO₂-equivalent. Regulators and downstream refiners now demand a carbon ledger, and on paper it used to be disputed; now a hash comparison confirms the carbon data was not altered after the fact.

One implementation trap: the browser SHA-256 must match the backend audit implementation byte for byte, or the two ends compute different digests for the same receipt and the claim fails. We pin the algorithm version and the field concatenation order, and run a round-trip check before every release.