Abstract: Fake products are sold as original products at a slightly cheaper rate. These fake products are usually sold to make good money by selling counterfeit products using brand logos or names, but in reality they are a cheap quality product. Such fake products attract only using brand names, but are a growing scam. These products are designed to look almost similar to original ones. These types of products are termed as Second copy. These fake products not only damage brand value and economic systems but also pose significant threats to consumer health and safety. Traditional technologies for product verification, such as holograms, RFID, and barcodes, are increasingly being defeated by counterfeiters. Blockchain plays an important role in detecting fake products using various approaches. The approaches discussed range from Ethereum-based smart contracts to Hyperledger Fabric systems and advanced QR code encryption techniques. These systems ensure data integrity, enhance product traceability, and minimize reliance on centralized intermediaries. Additional layers like protected QR codes and AES encryption further bolster security against cloning and tampering.

Keywords: Blockchain, Counterfeit Detection, Smart Contracts, Product Traceability, QR Code Encryption, Ethereum, Hyperledger.

| DOI: 10.17148/IARJSET.2025.12745