Web3 security plays a crucial role in ensuring the integrity, privacy, and trustworthiness of decentralized systems and protocols. However, securing Web3 infrastructures poses unique challenges due to the distributed and dynamic nature of these networks. Traditional security approaches often fall short in detecting and mitigating emerging threats in Web3 environments. In this article, we will explore the paradigm shift in Web3 security through the use of LLM-powered anomaly detection. LLM, or Language Model-based Log, is a cutting-edge technology that leverages machine learning and natural language processing to detect anomalies and potential security breaches in Web3 systems.