The point of a digital warehouse receipt is to turn 'who owns this cargo' into a number nobody can alter. On the client side we run SHA-256 over the bill of lading, the inspection report and the warehouse voucher; the 256-bit hash becomes the cargo's ID.

The new layer is carbon. Until now carbon data and title lived in separate systems, and a buyer chasing ESG had to open a second platform. We now record each batch's carbon calculation — emission factors from load port to discharge, mode of transport, conversion coefficients — straight into an extension field of the same hash. One scan shows everything.

This matters most for arbitrage trades. An Oman crude cargo transshipped at Muscat to Qingdao changes hands and documents several times, leaving a long title chain. Hanging the carbon data on the receipt lets a European buyer pull figures straight for CBAM filing instead of coming back to us for certificates.

Technically we do not store cleartext in a central database. Once the hash is on chain, even a back-end breach yields only irreversible fingerprints — no way to reverse-engineer the original bill. That single step makes both title and carbon data hold up.

Members now type a receipt number on the traceability page and get the full timeline from load port to delivery plus the matching carbon intensity, far faster than flipping through PDF attachments.