Blockchain Security Threats: Survey

Blockchain technology has seen extensive application across various sectors since its introduction. The rise of cryptocurrencies, such as Bitcoin, and smart contracts have significantly enhanced the security and efficiency of digital systems through blockchain. Nevertheless, an in-depth examination of blockchain security remains necessary. This paper systematically reviews the security threats to the blockchain, examines real-world attacks, and proposes countermeasures to enhance the technology’s security. The goal is to aid in developing more secure blockchain systems and highlight future research directions in this area.