This episode of the Chainguard Explained series explores how Chainguard Libraries help organisations secure open-source dependencies and build a more trusted software supply chain. Sam Ward introduces the challenges of relying on third-party packages, including vulnerabilities, unknown provenance, and the risk of malicious code entering development environments. The session demonstrates how Chainguard rebuilds open-source libraries from verified source code, providing stronger software provenance, cryptographic verification, and SBOMs. Sam also provides a practical walkthrough of installing and verifying Chainguard Libraries, showing how teams can confidently use secure open-source components in their applications.