Financial systems are becoming increasingly digital and decentralized, demanding a practical fusion of distributed systems security and economic theory. A key enabler of this change, blockchain technology, promises more private and egalitarian economic mechanisms, built by facilitating consensus between pseudonymous actors. However, the theoretical security of these systems may mask significant real-world risks.

In this talk, Aviv Yaish will present recent advances in bridging this gap between theory and practice.
First, he will discuss the resolution of a decade-old puzzle: the lack of observed attacks on major consensus mechanisms.
Then, he distills the lessons learnt into a holistic approach to designing robust systems and demonstrates its adoption in practice using three lines of work on denial-of-service resistance in distributed systems, auctions with untrusted auctioneers and bidders, and markets where consumers may cheaply create new identities.

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