@inproceedings{xiao2020privacyguard,
  title={PrivacyGuard: Enforcing private data usage control with blockchain and attested off-chain contract execution},
  author={Xiao, Yang and Zhang, Ning and Li, Jin and Lou, Wenjing and Hou, Y Thomas},
  booktitle={European Symposium on Research in Computer Security},
  pages={610--629},
  year={2020},
  organization={Springer}
}