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The Lightning Network is the most widely used payment channel network (PCN)to date, making it an attractive attack surface for adversaries. In this paper,we analyze the Lightning Network's PCN topology and investigate its resiliencetowards random failures and targeted attacks. In particular, we introduce thenotions of channel exhaustion and node isolation attacks and show that theLightning Network is susceptible to these attacks. In a preliminary analysis,we confirm that the Lightning Network can be classified as a small-world andscale-free network. Based on these findings, we develop a series of strategiesfor targeted attacks and introduce metrics that allow us to quantify theadversary's advantage. Our results indicate that an attacker who is able toremove a certain number of nodes should follow a centrality-based strategy,while a resource-limited attacker who aims for high efficiency should employ ahighest ranked minimum cut strategy.

Discharged Payment Channels: Quantifying the Lightning Network's Resilience to Topology-Based Attacks