Blockchain security is critical for safeguarding decentralized systems and digital assets. With threats like smart contract bugs, 51% attacks, and phishing scams, regular audits are essential to identify vulnerabilities and enhance system resilience. By following best practices, such as secure coding standards and multi-signature wallets, and leveraging emerging tools like automated code analysis and threat intelligence platforms, organizations can build trust and stability. As blockchain evolves, advanced security measures and continuous auditing will remain the foundation of a secure and reliable ecosystem.