The CBAM 2026 compliance date is counting down; current free allocations phase out from 2034, and importers will gradually cover the gap with carbon certificates. The first six sectors are steel, aluminium, cement, fertiliser, electricity and hydrogen. Petrochemicals are not yet listed, but EU buyers have already written batch-level product carbon footprint into purchase terms, pulling the compliance window forward.

SNSUC breaks PCF down to the batch: each cargo gets a browser-side SHA-256 fingerprint binding origin, process route and energy use into one hash, so the footprint cannot be altered after the fact. When a bank pledges the receipt or customs checks origin, both pull the full carbon ledger from the same fingerprint without duplicate filing.

Cross-chain receipt recognition is the other piece. A receipt is issued on one chain, pledged on a bank chain and written off on a customs chain; all three trust one SHA-256 fingerprint, so title and carbon data travel with it. For Europe-bound cargo this turns CBAM from pay-at-import into compliant-at-export, cutting document prep from weeks to days.