His current research focuses on infrastructure services for large-scale distributed systems, such as key-value stores, graph databases, and consensus protocols. He is also interested in self-organizing systems and cryptocurrencies, where he is known, with Ittay Eyal, for discovering and fixing the biggest protocol-level attack known against Bitcoin to date, called Selfish Mining. He has also been active in improving transaction rates in Bitcoin and evolving the mining ecosystem towards decentralization.