The Ethereum Security Initiative (ESI) is a project led by the Ethereum Foundation to enhance the security of the Ethereum network and the decentralized applications built on it. ESI brings together developers, researchers, and security experts to work on discovering vulnerabilities, improving smart contracts, and developing advanced auditing tools.

The initiative also supports open-source projects, encourages responsible disclosure of vulnerabilities, and establishes best security practices. ESI aims to build a safer and more reliable environment, ensuring the future scalability of the Ethereum network in the face of increasing threats.