CPDT: A copyright-preserving data trading scheme based on smart contracts and perceptual hashing

Data has become an integral part of the modern world, and its value has led to the creation of new markets for data trading. Protecting the copyright of trading data and ensuring the fairness of transactions present significant challenges in the current trading market. Therefore, we propose a copyright preserving data trading scheme based on smart contracts and perceptual hashing, called CPDT, which use smart contracts, combined with perceptual hashing, to prevent malicious acts of illegal reselling and to ensure fair transactions. We have also designed a perceptual hashing algorithm for our trading scheme. Extensive experiments have been conducted to demonstrate the feasibility of the scheme.