In recent years, counterfeit products have played an important role in the manufacturing industry. This affects company name, sales, and corporate profits. Blockchain technology is used to identify real products and to detect counterfeit products. Blockchain technology is a distributed, customized, and digital book that stores information in the form of blocks in multiple archives linked to chains. Blockchain technology is a secure technology so any block cannot be changed or hacked. By using Blockchain technology, customers or users do not have to rely on third-party users to ensure product security. The concept of Product Copy Management System against counterfeit products that can be used in a series of postal merchant supply chain using QR code. By using a blockchain-based application platform that will help overcome the problems associated with an effective supply chain management system and provide a way to prove product ownership. Keywords- Blockchain, QR Code, Supply Chain, Solidity, Counterfeit products.
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