Conflicting transactions within blockchain networks not only pose performance challenges but also introduce security vulnerabilities, potentially facilitating malicious attacks. In this paper, we explore the impact of conflicting transactions on blockchain attack vectors. Through modeling and simulation, we delve into the dynamics of four pivotal attacks - block withholding, double spending, balance, and distributed denial of service (DDoS), all orchestrated using conflicting transactions. Our analysis not only focuses on the mechanisms through which these attacks exploit transaction conflicts but also underscores their potential impact on the integrity and reliability of blockchain networks. Additionally, we propose a set of countermeasures for mitigating these attacks. Through implementation and evaluation, we show their effectiveness in lowering attack rates and enhancing overall network performance seamlessly, without introducing additional overhead. Our findings emphasize the critical importance of actively managing conflicting transactions to reinforce blockchain security and performance.

翻译：区块链网络中的冲突交易不仅带来性能挑战，还引入了安全漏洞，可能助长恶意攻击。本文探讨了冲突交易对区块链攻击向量的影响。通过建模与仿真，我们深入研究了四种关键攻击的动态特征——区块扣留攻击、双花攻击、余额攻击及分布式拒绝服务（DDoS）攻击，这些攻击均通过冲突交易实施。我们的分析不仅关注这些攻击如何利用交易冲突的机制，还强调了它们对区块链网络完整性与可靠性的潜在影响。此外，我们提出了一套缓解这些攻击的对策。通过实施与评估，我们证明这些措施能有效降低攻击率并提升整体网络性能，且无需引入额外开销。我们的研究结果强调了主动管理冲突交易对于增强区块链安全与性能的至关重要性。