SNSUC's traceability stack uses a browser-side SHA-256 fingerprint as the verification entry point: a buyer needs to trust no intermediary, recomputing hashes for the warehouse receipt, inspection report and bill-of-lading elements locally and comparing them with the on-chain anchor. Covering thirteen operating categories and seven crude re-export grades, it turns title verification from a paper relay into a single, independently recomputable check.

Beyond the 'three-documents-consistent' rule, commodity classification (HS codes) and inspection-supervision interpretation form the second watershed for the landed cost of re-exported oil products. Threshold specifications for base oil, paraffin wax and petroleum coke — viscosity index, drop/melting point, sulphur and ash content — directly determine the applicable tariff line and the required certificate package. SNSUC Research Institute recommends replacing 'settle it on arrival' with 'classification upfront', backed by on-chain attestation of inspection reports and certificates of origin.

Facilitation of cross-border RMB settlement for offshore re-export continues to advance, with USD/CNY steady at 6.7190 (CNY strengthening) and the import hedging window narrowing. The expansion of the Shanghai FTZ 'authenticity evidence whitelist' and cross-chain mutual recognition of digital warehouse receipts (SHA-256 hash on-chain) are accelerating documentation flows, further shortening the implementation cycle of the 'three-documents-consistent' compliance architecture.