Assessing the Topological Vulnerabilities of Bitcoin’s Lightning Network: Robustness Against Random Failures and Targeted Attacks

The Bitcoin Lightning Network (LN) provides an innovative solution for scaling Bitcoin transactions by enabling off-chain payments with minimal fees and near-instantaneous settlement. LN's structure consists of interlinked payment channels, forming a decentralized network to facilitate efficient and secure transaction routing. This article investigates the topological characteristics of LN and examines its resilience to random and targeted disruptions. The Lightning Network can be modeled as a weighted, undirected graph to analyze various metrics such as clustering coefficients, degree distribution, and centrality. Results reveal that LN exhibits scale-free properties, contributing to robustness against random node failures. However, the network's reliance on high-degree nodes also makes it vulnerable to targeted attacks, which can fragment the network and impair transaction routing. These insights highlight the need for network design optimizations to enhance LN's security and scalability. Future considerations could focus on strategic topology adjustments to fortify LN against adversarial threats, ensuring more reliable off-chain transaction capabilities.