Switch to Cosign when a concrete requirement—such as registry-centered image signing across CI systems or custom Sigstore infrastructure—outweighs the convenience of GitHub-native attestations. If builds run in GitHub Actions and GitHub’s attestation storage and verification meet consumer needs, switching is not automatically an upgrade. Choose based on where artifacts are built and distributed, which identities consumers trust, and how verification is enforced.
What the choice actually changes
GitHub artifact attestations and Cosign are overlapping approaches built around Sigstore concepts, but they serve different integration and trust boundaries. GitHub artifact attestations provide signed provenance claims that connect an artifact digest to build context. Cosign is a Sigstore signing tool suited to registry-oriented workflows and configurable Sigstore services.
Neither approach establishes that software is harmless or vulnerability-free. Attestation is evidence about an artifact’s origin and process; consumers must verify that evidence and decide whether its source, signer, predicate, and build process meet policy. GitHub explicitly cautions that an attestation is not a guarantee of security (GitHub artifact attestations).
When GitHub artifact attestations fit
Builds already run in GitHub Actions
GitHub’s native flow is a natural fit when Actions is the trusted build environment. GitHub describes attestations as cryptographically signed provenance claims that can link an artifact to its workflow, repository, organization, environment, commit SHA, triggering event, and other information from the OIDC token. An attestation can also include an associated SBOM.
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GitHub says artifact attestations by themselves provide SLSA v1.0 Build Level 2. It describes trusted reusable workflows as a way to add isolation between a build and its calling workflow that can help meet SLSA v1.0 Build Level 3. That is a description of documented capability, not an automatic assurance that every implementation reaches those levels.
Consumers can verify GitHub’s evidence
GitHub CLI’s gh attestation verify can verify a local artifact or an OCI image. It can retrieve evidence through the GitHub API, from an OCI registry using --bundle-from-oci, or from a local bundle for offline verification. It can also emit JSON for further policy enforcement. This can suit consumers that want GitHub-native provenance alongside a practical verification path.
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The plan and repository context support it
The actions/attest project documentation says public repositories can use attestations on current GitHub plans, while private and internal repositories require GitHub Enterprise Cloud; GitHub Enterprise Server is unsupported. These plan rules can change, so check the current actions/attest documentation for the repository and plan you intend to use.
When Cosign is worth evaluating
Signing is centered on OCI registries
Cosign is a stronger candidate when container images are distributed through OCI registries and the team needs registry-oriented signing and signature discovery. Sigstore’s FAQ lists registry support, registry API operation, signature discovery, support for multiple entities signing an image, and signing without mutating the image among Cosign’s goals (Sigstore FAQ).
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Signing needs to span environments
If signing must work beyond GitHub’s attestation service or across several CI environments, evaluate Cosign’s identity-token flow and how it fits each environment. In Sigstore’s documented default flow, an OIDC identity obtains a short-lived certificate and a timestamped Rekor entry records the signing event. The short-lived private key is destroyed shortly after use, so verification relies on recorded evidence rather than a long-term private key held by the signer. Sigstore documents Microsoft, Google, and GitHub as supported identity systems in that flow (Cosign signing overview).
You need control over Sigstore services
Cosign documentation shows how to configure custom Fulcio, Rekor, and timestamp authority endpoints. That can matter when organizational infrastructure or policy requirements call for a custom setup. Self-hosting is an option, not a prerequisite for ordinary Cosign use.
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Compare the producer-to-consumer path
| Decision axis | GitHub artifact attestations | Cosign |
|---|---|---|
| Build environment | Directly integrated with GitHub Actions. | Supports identity-token-based signing workflows; evaluate the issuer and setup for each CI environment. |
| Artifact distribution | GitHub CLI verifies local artifacts and OCI images; it can obtain bundles from GitHub, an OCI registry, or a local bundle. | Designed with registry support and signature discovery among its goals. |
| Identity checks | GitHub CLI supports owner, repository, signer-workflow, signer-repository, and certificate identity checks. | The documented public flow uses identity tokens and short-lived certificates; configure verification to accept the intended identity. |
| Transparency and privacy | Public-repository attestations use the Sigstore Public Good Instance and a publicly readable transparency log. Private-repository attestations use GitHub’s Sigstore instance, which GitHub documents as having no transparency log and federating only with GitHub Actions. | The documented default flow records a timestamped signing event in Rekor; custom service endpoints are configurable. |
| Policy integration | GitHub CLI can output JSON for further policy enforcement; GitHub documentation also links to an admission-controller pattern. | Choose verification and policy integration that match the registry and deployment environment; the cited Cosign guidance does not prescribe one policy engine. |
| Service control | Uses GitHub’s attestation service and the applicable public or private-repository trust path. | Can be configured to use custom Fulcio, Rekor, and timestamp authority services. |
How to verify GitHub attestations meaningfully
A verification result is only as useful as the identity and predicate policy behind it. GitHub CLI requires an artifact and checks the attestation’s actor identity and expected predicate type; its default predicate is SLSA provenance v1. Verification also requires at least an owner or repository scope. GitHub recommends checking signer workflow or certificate identity for stronger control (GitHub CLI verify manual).
- Set the trusted scope. Specify the expected owner or repository rather than accepting evidence without a source boundary.
- Constrain the signer. Check the workflow or certificate identity. If a reusable workflow produced the artifact, the reusable workflow is the signer whose identity needs to be checked.
- Define acceptable provenance. Decide which predicate type, source refs, workflow paths, and deployment conditions satisfy your policy.
- Enforce the decision. Consume verification output in a release or deployment gate; generating attestations without verifying them does not deliver the intended security benefit.
One important limitation concerns predicate contents: GitHub CLI documentation warns that a compromised workflow execution context could falsify predicate content. The certificate and verified timestamp are the fields the originating workflow cannot manipulate. Where that threat matters, use a trusted builder or reusable workflow whose execution cannot be influenced by caller inputs (GitHub CLI verify manual).
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Set up GitHub attestation permissions carefully
The documented actions/attest workflow example specifies id-token: write, attestations: write, and artifact-metadata: write. These permissions enable token minting, attestation persistence, and artifact storage records, respectively. Scope them to the workflow that needs them, using the project’s workflow guidance as the reference.
The action documentation supports provenance, SBOM, and custom modes. GitHub recommends signing released software, binaries, packages, and manifests intended for consumer verification—not frequent test builds or individual source, documentation, and embedded image files.
Quick Recap
Make the switch decision
- Stay with GitHub artifact attestations when GitHub Actions is your trusted builder, GitHub-native evidence and verification suit your consumers, and your repository plan supports the feature.
- Evaluate Cosign when registry-centered image signing, use beyond GitHub’s attestation service, or custom Sigstore infrastructure is a real requirement. Confirm identity issuer, signature discovery, bundle storage, and verification behavior in the registries and CI environments you actually use.
- Use both only for a defined reason. For example, GitHub provenance and a separate Cosign image-signing requirement may serve different consumers. Avoid duplicating signatures unless deployers know which evidence they trust and how to verify it.
- Do not switch on a vague security claim. Compare build isolation, signer identity, artifact storage, verification enforcement, and the threat model from producer through consumer.
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