They solve different parts of the problem, so the right answer is to use both where applicable. Provenance governs how a package was built and published, while Subresource Integrity governs what the browser executes when code is loaded from a CDN. Teams should prioritise the control that matches the delivery path they actually use.
Why provenance and SRI answer different trust questions
Use provenance when you need to know how software was built, signed, and published. Use subresource integrity when you need the browser to verify that the exact script or stylesheet fetched from a CDN has not changed. They are not substitutes: provenance speaks to the supply chain, while SRI speaks to the delivered byte stream.
The practical question is not which control is “better,” but which control aligns to the delivery path in front of you. A package manager, build pipeline, and artifact repository create different trust assumptions than a browser loading third-party code at runtime. That is why the right control can change by asset, channel, and deployment model.
Where each control belongs in the delivery chain
Provenance is most useful upstream, where the team is deciding whether an artifact came from a trusted build process and whether the published output matches what the pipeline produced. It helps with traceability, integrity, and later verification of the package or image before it is installed or promoted.
SRI is downstream and client-facing. It matters when your application embeds external assets and the browser must reject a CDN response that does not match the expected hash. It does not tell you whether the software was built correctly, only whether the code the browser received is the code you intended to run.
In practice, teams often need both because the controls cover different failure points. Provenance can protect against compromised build systems, tampered release artifacts, and weak publication workflows. SRI can protect against CDN compromise, cache poisoning, or unexpected script replacement after release.
How to choose first without under-protecting the path you actually use
If your risk starts before the browser, prioritise provenance. If the main exposure is third-party code executed in the browser, prioritise SRI. Many teams should implement provenance for packages, containers, and build outputs first, then add SRI for any external browser-delivered assets that remain on the page.
That ordering is especially important when one control cannot see the other control’s failure mode. A strong build attestation does not stop a CDN from serving altered JavaScript, and an SRI hash does not prove that your release pipeline produced the right artifact. Matching the control to the trust boundary avoids false confidence.
For software supply chain work, SLSA is the clearest external reference for build provenance and artifact integrity, while OpenSSF provides broader supply chain security guidance and ecosystem projects. For application teams shipping browser-delivered assets, the browser-side integrity check is the point where SRI earns its value.
Risk and Threat Considerations
The main risk is treating provenance and SRI as interchangeable and leaving a gap at the actual trust boundary. If teams only attest the build, a tampered CDN response can still execute. If teams only pin browser assets, a compromised build pipeline can publish malicious code that is faithfully delivered and then correctly hashed.
Failure mechanism: Attackers exploit whichever control is missing at the weakest point in the delivery path, such as build tampering, artifact substitution, CDN compromise, or unauthorized script replacement after publication.
Impact: The result can be execution of untrusted code, supply-chain compromise, or a release process that appears controlled while still exposing users to altered content.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
SLSA, OWASP ASVS and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| SLSA | Supply-chain Levels for Software Artifacts | Build provenance is central to deciding whether a package was produced by a trusted pipeline. |
| Recommendation — Adopt SLSA-aligned provenance checks for build and publish integrity before release. | ||
| OWASP ASVS | V12 — Secure Communication | Browser-delivered assets rely on integrity of transmitted code and content. |
| Recommendation — Use integrity checks for externally delivered assets that the browser executes. | ||
| NIST SP 800-53 Rev 5 | SI-7 — Software, Firmware, and Information Integrity | The question is about selecting integrity controls across delivery paths and trust boundaries. |
| Recommendation — Apply integrity verification controls to both published artifacts and runtime-delivered content. | ||
Practitioner Guidance
What to prioritise: Start with the trust boundary that actually delivers code to users. If you publish packages or images, establish provenance first; if you load third-party assets in the browser, add SRI for those assets as soon as practical.
What to verify: Confirm that provenance metadata is preserved through publishing and that the browser is checking integrity on every external asset where the hash can be maintained operationally. If either control is bypassed in practice, treat the gap as the real requirement, not the intended architecture.
Practitioner takeaway: The best sequence is usually provenance upstream and SRI at the browser edge, because each control closes a different integrity gap and neither one covers the other.
Related resources from NHI Mgmt Group
- How should teams use file integrity monitoring to support identity governance?
- How should security teams use file integrity monitoring alongside other controls?
- How do security teams decide whether to use validation or retrieval controls first?
- What do security teams get wrong about AI integrity and provenance?
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Reviewed and updated by the NHIMG editorial team on October 12, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org