SNSUC's digital warehouse receipt does not vest trust in a central server; it vests trust in a single hash computed in the browser. The title holder uploads three files locally — the warehouse receipt PDF, the inspection report and the title endorsement — and the page runs each through SHA-256 via the Web Crypto API, producing a 64-character hexadecimal fingerprint per file. The three fingerprints are concatenated and hashed once more, yielding a global fingerprint for the whole receipt.

The original files never leave the client. Only the hash values go on-chain for notarization. The payoff: even if the server is breached, an attacker cannot forge a receipt whose fingerprint matches, because the hash is one-way — change a single byte and the fingerprint changes. To verify, the buyer simply recomputes the three file hashes in the browser and compares them with the on-chain record; a match proves authenticity.

The ESG carbon footprint travels the same path. For every transshipment, freight from load port to destination, port handling and warehouse power draw are converted into CO₂ equivalents by commodity, and the resulting footprint object is hashed and notarized. Downstream refiners can cite this hashed credential directly in their ESG disclosures, and auditors can recompute it independently without asking us for a letter.