Blockchain-based Privacy-preserving Crowdsourcing Scheme

This paper presents a blockchain-based decentralized crowdsourcing framework that addresses challenges in traditional crowdsourcing systems, such as user identity, privacy, centralized servers, and service fees. The framework ensures anonymity, transparency, and fairness in crowdsourcing services by leveraging blockchain technology. To tackle linkability issues in blockchain-based systems, the paper proposes using cryptocurrency accounts with enhanced privacy features to protect user reputation while preserving privacy. Strategies to prevent private transactions and free-riding behavior are also proposed to enhance the crowdsourcing process integrity. The contributions of this work include a secure and anonymous crowdsourcing platform design, smart contract implementation, and feasibility evaluation through experiments on a local Ethereum blockchain. The experimental results demonstrate the practicality and efficiency of the proposed solution.