Dependency Provenance
Dependency provenance — the documented origin, publisher identity, build process, and trust chain of software dependencies — and the attestation frameworks that enable supply-chain verification.
Primary question: What is dependency provenance and what attestations exist for software dependencies?
Direct answer
Dependency provenance is the documented evidence of a dependency's origin — who published it, from what repository, through what build process, and with what attestations. Provenance frameworks such as SLSA, in-toto, and Sigstore provide structured attestation formats that enable organizations to verify the trust chain of a dependency from source to published package.
Dependency provenance provides verifiable evidence about the origin and history of a software dependency. It answers who published the package, when it was published, from what source, and whether the content matches what was declared.
Without provenance, organizations cannot reliably distinguish between authentic and compromised dependencies in the software supply chain.
Definitions
Dependency provenance
The documented origin and history of a dependency, including the publisher identity, source repository, build environment, and any attestation records. Provenance answers the questions of who, what, where, and how a dependency was produced.
Provenance attestation
A machine-readable, signed record that describes the origin and build process of a software artifact. Attestations follow structured formats such as SLSA, in-toto attestation statements, or Sigstore transparency logs.
Trust chain
A sequence of verifiable attestations and cryptographic signatures that trace a dependency from its source code through the build process to the published package. A trust chain is only as strong as its weakest link.
SLSA
Supply-chain Levels for Software Artifacts, a framework that defines progressively stricter provenance requirements for software artifacts across four levels, from basic to highly assured.
Sigstore
An open-source supply-chain security project that provides transparency logs, keyless signing, and attestation storage for verifying artifact provenance.
The engineering problem
Most packages published to public registries have no documented provenance. Organizations installing these packages cannot verify who built them, from what source, or through what process.
Provenance attestations are not universally adopted. A dependency may have partial provenance (e.g., publisher identity is known but build process is undocumented), making trust assessment incomplete.
Provenance can be forged. Attestations are only trustworthy if the signing keys and build environments are themselves secure. Compromised signing keys or build infrastructure invalidate the trust chain.
Security controls
Each control inspects a different artifact and produces evidence for an engineering decision.
Attestation format adoption
Provenance standards- Artifact
- Dependencies accompanied by standardized provenance attestations (SLSA, in-toto, Sigstore) that can be machine-verified.
- Risk
- Relying on non-standard or undocumented provenance records that cannot be independently verified.
- Output
- Dependencies with standardized, machine-verifiable provenance attestations.
Evidence:
Trust chain validation
Chain verification- Artifact
- A dependency whose full provenance chain has been validated — each attestation in the chain has been verified, including signature verification and timestamp validation.
- Risk
- Partially validated chains that skip intermediate attestation verification.
- Output
- Validated trust chain with all intermediate attestations confirmed.
Evidence:
Publisher identity assurance
Publisher verification- Artifact
- Evidence that the package was published by the expected and authorized publisher, verified through registry policies, key signing, or organizational identity management.
- Risk
- Installing a package from a publisher whose identity is unverified or impersonated.
- Output
- Confirmed publisher identity with documented verification.
Evidence:
Verification workflow
- Dependencies are selected for use in the project.
- Provenance attestations are checked for each dependency — are standardized attestation formats available? (SLSA, in-toto, Sigstore)
- For dependencies with provenance, the trust chain is validated — each attestation is verified, signatures are checked, and timestamps are confirmed.
- For dependencies without provenance, the risk is documented and assessed based on the dependency's criticality and the organization's risk policy.
- Provenance quality is tracked as a supply-chain security metric.
DerScanner · Enterprise
Relationship to DerScanner
DerScanner provides SCA analysis that identifies open-source components, vulnerabilities in open-source libraries, and software-supply-chain risks. SCA provides dependency-tree visualization and package health assessment to support dependency provenance verification.
DerScanner performs software-composition analysis that identifies open-source components, vulnerabilities in open-source libraries, and software-supply-chain risks. SCA provides dependency-tree visualization and package health assessment to support dependency provenance verification. [derscanner-sca]
Limits of verification
- Provenance verification depends on the availability and accuracy of provenance information from package registries and maintainers.
- Not all package registries provide sufficient provenance data for complete chain validation.
- Provenance does not guarantee that a dependency is free of vulnerabilities — it only confirms authenticity and integrity.
Related knowledge
Software Dependency Verification
The broader process of verifying dependency authenticity and integrity
Relationship: related-toMalicious Open-Source Packages
How malicious packages can compromise the supply chain
Relationship: related-toTransitive Dependency Risk
Risks associated with indirect dependencies
Relationship: related-toBuild Pipeline Supply Chain Security
Securing the build process as part of supply-chain security
Relationship: related-toSoftware Artifact Integrity
Verifying the integrity of build artifacts
Relationship: related-toCanonical terms used: Dependency provenance; Provenance attestation; Trust chain.
Evidence and references
- DerScanner SCA documentationDerScanner SCA identifies open-source components, vulnerabilities in open-source libraries, software-supply-chain risks, license risks, dependency-tree visualization, package health assessment, and hybrid SAST+SCA function reachability.
derscanner-sca
Supply-chain security