- Alex Biryukov, Dmitry Khovratovich, Ivan Pustogarov, "Deanonymisation of clients in Bitcoin P2P network", ACM CCS 2014, Arizona, USA (early version in archive, revised paper)
- Alex Biryukov, Ivan Pustogarov, "Proof-of-Work as Anonymous Micropayment: Rewarding a Tor Relay", Financial Cryptography 2015, Puerto-Rico, USA. ( paper)
- Alex Biryukov, Ivan Pustogarov, "Bitcoin over Tor isn't a good idea", IEEE Security and Privacy Symposium 2015, ( paper, slides)
See also our work on memory-hard proofs of work, like Argon2.