The EU Carbon Border Adjustment Mechanism (CBAM) enters its definitive period in 2026, free allowances phase out from 2034, and the first six sectors are covered. Petrochem is not yet in scope, but batch-level PCF is already a customer front-running requirement for crude resales; cross-chain receipt recognition plus SHA-256 attestation makes carbon data verifiable and auditable.

With the CBAM 2026 compliance date approaching and free allocations phasing out from 2034, petrochemicals are not in the first six sectors but batch-level product carbon footprint is already a pre-export clause. Browser-side SHA-256 attestation plus cross-chain receipt recognition turn carbon data into evidence both banks and customs accept.