A digital warehouse receipt used to buy its trust from a third-party validator. We moved SHA-256 into the browser: the title holder hashes the receipt fields — grade, quantity, warehouse, validity — locally, the fingerprint never leaves the device, and only the 64-character hex digest hits the chain. Title verification shifts from 'wait for an institution to countersign' to 'compute it yourself on the spot,' and forging a receipt now means breaking the hash function first.

The ESG leg rides the same receipt. A carbon-footprint field is attached: emission factors from origin, transport mode, and delivery warehouse stack into a per-tonne carbon intensity. Buyers screen cargo against their own reduction targets; sellers write the low-carbon path as verifiable data instead of a 'we are green' claim.

For the operator the value lands in three places: the receipt is verifiable from issuance to transfer, so financed collateral cannot be pledged twice; the carbon data travels with the document, so cross-border delivery skips the second spreadsheet rebuild; and the browser-side run needs no install — a client generates the fingerprint from a phone, which drops the onboarding bar to the floor.