Abstract
Blockchain systems, characterized by decentralization, traceability, and robust security, are increasingly adopted across various domains including finance due to their strong disaster recovery capabilities. This paper focuses on the security mechanisms underpinning Bitcoin and Ethereum, two dominant cryptocurrencies, and examines potential vulnerabilities and attack vectors targeting blockchain technologies. Specifically, it addresses attacks on consensus mechanisms, network structures, and application layers, outlining the cryptographic methods integral to blockchain security. The study delves into the types of attacks that exploit these vulnerabilities, such as forking, stale or orphaned blocks, selfish mining, and majority attacks, which threaten the integrity and consistency of blockchain systems. Additionally, it reviews the current defense mechanisms and proposes new strategies to enhance the security and resilience of these digital platforms. By exploring these security challenges comprehensively, the paper aims to provide deeper insights into the defense strategies that can fortify blockchain against such vulnerabilities, thereby enhancing its reliability and trustworthiness in digital transactions and ensuring its sustainable integration into the digital economy.
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