Information Trust Institute block of abstract images
Information Trust Institute block of abstract images

TSS/SoS Seminar: Anonymity in Bitcoin Peer-to-Peer Network


Giulia Fanti, University of Illinois at Urbana-Champaign

Date Tue, 2017-02-21

Coordinated Science Lab Auditorium (B02)

Time 4:00 pm

Information Trust Institute

Event Type Lecture

Abstract: Bitcoin enjoys a public perception of being a 'privacy-preserving' financial system. In reality, Bitcoin has a number of privacy vulnerabilities, including the well-studied fact that transactions can be linked through the public blockchain. More recently, researchers have demonstrated deanonymization attacks that exploit a lower-layer weakness: the Bitcoin peer-to-peer (P2P) networking stack. In particular, the P2P network currently forwards content in a structured way that allows observers to deanonymize users by linking their transactions to the originating IP addresses. In this work, we first demonstrate that current protocols exhibit poor anonymity guarantees, both theoretically and in practice. Then, we consider a first-principles redesign of the P2P network, with the goal of providing strong, provable anonymity guarantees. We propose a simple networking policy called Dandelion, which achieves nearly-optimal anonymity guarantees at minimal cost to the network's utility.