verifying-sigstore-signatures

To verify a cosign signature before deployment, you validate the digest-pinned artifact against a declared trust policy, checking Rekor inclusion and OIDC issuer identity to return a final deploy decision.

SLSA provenance attestation is verified build metadata mapped to a specific SLSA Build level. You need it for supply-chain security when auditing artifacts to flag incomplete or mismatched provenance before production release.

Yes, you can use Sigstore verification for Python wheels and npm packages. The verification process applies to these formats alongside container images and generic blobs, validating signatures and provenance for deployment workflows.

To check if an artifact signature matches your trust policy in CI, validate the signer identity and OIDC issuer against the allowed policy, then use the per-check verdict for CI gatekeeping to block untrusted artifacts.

Sigstore verification fails without digest-pinned references because immutable digests are required to securely map artifacts to their Rekor transparency log entries and validate the corresponding cosign signatures accurately.

The best way to audit supply-chain compliance for generic blobs is to verify their Sigstore signatures and optional in-toto SLSA provenance attestations, mapping the build metadata to confirm an appropriate SLSA Build level.