This repository hosts the SLSA (Supply-chain Levels for Software Artifacts) specification, a security framework for software supply chain integrity. It is primarily a documentation and specification project, not a software application or a data pipeline. The repository contains the normative specification documents (e.g., build provenance, source requirements, dependency track), a Jekyll-based website for versioned publication, tooling scripts for linting and version management, and CI/CD workflows for maintaining the site. It defines formal attestation schemas in Protobuf and CUE, provides threat models and security principles, and includes community blog posts and how-to guides. While not a standalone deployable application, it serves as the authoritative reference for SLSA levels, tracks, and verification protocols, and its reusable patterns (provenance predicate formats, site navigation components, assessment prompts) can be adopted by other security specification projects.