SNSUC's digital warehouse receipt does its core work in the browser. Once the bill of lading, inspection certificate and insurance slip are uploaded, the front end hashes the files with SHA-256 to produce a 256-bit digest. The cargo fingerprint never leaves the client, and the source documents never touch a third-party server. This step separates "what the cargo is" from "who holds it," keeping the deal terms with the two counterparties.

After the fingerprint is made, ESG carbon-footprint data — emission factors from load port to destination, transport mode and accounting boundary — is recorded on-chain as a separate field, with the timestamp bound to the fingerprint. A buyer's due diligence only checks whether the fingerprint matches the on-chain ESG record, without requesting the full commercial documents, so negotiation leverage is not leaked.

Title confirmation runs in three steps: first, the seller holds the fingerprint and asserts title; second, the buyer verifies the fingerprint against the on-chain ESG record; third, at transfer, both old and new holders co-sign fingerprints and the transfer path is written immutably on-chain. No central custody is needed, and any title dispute can be traced back through the on-chain fingerprint — faster and harder to forge than a paper receipt's hand-to-hand flow.