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Two oci-explorer score cards stacked. The top one is a busybox image with four 20-byte junk files attached and scores 9 out of 10, grade A. The bottom one is oci-explorer's own image, keylessly signed in CI and verified with cosign, and also scores 9 out of 10, grade A.

Grade A, Signed by Nobody: What oci-explorer's Supply Chain Score Actually Measures

Ask most teams what’s attached to the container image running in production and you’ll get an answer about their CI pipeline: “we sign it, we generate an SBOM, we attach provenance.” That’s a statement about what the pipeline tried to do. Whether the registry actually holds those things, linked to the right image, in a form the next tool can find, is a different question, and it’s surprisingly hard to answer in under a minute. ...

October 2, 2026 · 21 min · Scott Algatt