How to verify SBOM authenticity and integrity?

To verify SBOM authenticity and integrity, first require signed SBOMs (SPDX/CycloneDX) using Sigstore/cosign or PGP. Validate the signature against a trusted root, then check the SBOM digest matches the artifact’s attestation (in-toto/SLSA provenance). Store SBOMs and attestations in an immutable registry (OCI) and enforce verification in CI/CD gates. On pull/deploy, re-verify signatures, timestamp, and revocation status; fail closed if trust breaks. Continuously diff SBOMs across builds to detect tampering or drift. Log verifications to a tamper-evident system (e.g., transparency log). Include this in developer onboarding and azure devops training so teams actually use it, with policy enforcement and periodic audits.