Blockchain-based decentralized federated learning: A secure and privacy-preserving system. - Shuang Zhao; Yalun Wu; Rui Sun; Xiaoai Qian; Dong Zi; Zhiqiang Xie; Endong Tong; Wenjia Niu; Jiqiang Liu; Zhen Han 001 (HPCC/DSS/SmartCity/DependSys, 2021)