Chainloop: Open-Source Evidence Store and Policy Engine for the Software Supply Chain

Written By
JP
James Patterson
Sep 21, 2026

Chainloop is an open source evidence store for the software supply chain. A command line tool runs inside a GitHub Actions, GitLab, Jenkins, or Dagger pipeline, picks up what the build produced, uploads those files to content-addressable storage, and references each one in a signed in-toto attestation. in-toto is a specification for recording who ran which step of a build, so the record can be checked afterward.

JP

James Patterson

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