Design a normalized schema (3NF/BCNF) for Products, Warehouses/Locations, Inventory_Levels, Suppliers, Purchase_Orders, Sales_Orders, Audit_Logs, etc. Utilize advanced data types, constraints (CHECK, ...

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Abstract: Smart contracts, as self-executing programs on blockchains, have been applied in many Internet of Things (IoT) systems to achieve decentralized, fair, and auditable transaction services.