A BLOCKCHAIN-BASED PRIVACY-PRESERVING SOLUTION FOR AGRICULTURAL PRODUCT TRACEABILITY BASED ON GROUP SIGNATURES

Traceability is a crucial component in ensuring the secure sharing of information throughout the entire supply chain of agricultural products. However, existing blockchain-based traceability solutions lack identity anonymity, face challenges in regulatory traceability, and lack dynamic member management capabilities. This paper proposes a blockchain privacy protection scheme integrating group signatures, pseudonymity mechanisms, and revocable accumulators to address these issues. The core design of this scheme encompasses three key aspects: first, this study introduces a dynamic group signature algorithm to balance the anonymity of data signatures with the traceability of responsibility, ensuring both privacy protection and accountability for data sources. Second, this study designs a pseudonym-based identity-hiding and authentication-obfuscation mechanism to enhance privacy protection further, improve resistance to on-chain analysis, and prevent the leakage of user identities. Finally, an efficient dynamic member management protocol is constructed to support rapid node joining and flexible revocation, thereby addressing frequent member changes in agricultural supply chains. Security analysis indicates that the scheme meets stringent security requirements regarding anonymity, non-repudiation, and traceability. Experimental results show that the proposed scheme outperforms existing solutions regarding signature verification overhead, communication costs, and operational efficiency, demonstrating good practicality and scalability, and providing practical support for privacy protection and digital regulation in agricultural supply chains.