@article{secureandefficientfederatedlearning,
  title = {Secure and Efficient Federated Learning Through Layering and Sharding Blockchain},
  author = {Shuo Yuan and Bin Cao and Yao Sun and Zhiguo Wan and Mugen Peng},
  year = {2021},
  eprint = {2104.13130},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2104.13130v5},
}