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Thunderdome - Timelock-Free Rationally-Secure Virtual Channels

USENIX via YouTube

Overview

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Explore a groundbreaking conference presentation introducing Thunderdome, the first timelock-free payment channel network (PCN) designed to address critical vulnerabilities in blockchain transaction systems. Learn how this innovative solution eliminates the need for timelocks while maintaining security through a novel committee-based approach using non-trusted watchtowers called "wardens." Discover the technical architecture that enables multi-hop transactions between parties without shared channels, leveraging virtual channel design principles to extend timelock-free payment primitives. Examine the tailored incentive mechanisms that ensure protocol compliance and understand the formal game-theoretic analysis demonstrating security when all participants act rationally. Review the practical implementation on Ethereum, including cost analysis showing deployment costs of approximately $15 and worst-case channel closure costs of about $7, validating the feasibility of this approach to solving timelock and censoring attacks in payment channel networks.

Syllabus

USENIX Security '25 - Thunderdome: Timelock-Free Rationally-Secure Virtual Channels

Taught by

USENIX

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