Your compliance team just got handed another attestation framework. You're already collecting SBOMs, signing artifacts, and running policy checks across four CI/CD platforms. Now someone wants to add another layer of "evidence management" on top.
Here's the problem: most teams adopt supply chain security tools to solve a compliance checkbox problem, then wonder why auditors still find gaps. The myths around these tools persist because vendors sell capabilities, not outcomes. Let's clear up what actually matters when you're building verifiable software supply chains.
Myth 1: "We need a new tool to start collecting supply chain evidence"
Reality: You're already generating most of the evidence you need. Your CI/CD pipelines produce build logs, test results, scan outputs, and deployment records right now. The issue isn't collection, it's that this evidence lives in many different places with no chain of custody.
Look at your GitHub Actions workflows. You're running SAST scans, generating SBOMs, and pushing container images. Each step produces artifacts, but you can't prove to an auditor that the SBOM came from the same build as the deployed image. You need a structured way to link these artifacts, not more data sources.
Tools like Chainloop integrate with GitHub Actions, GitLab, Jenkins, or Dagger pipelines to capture what you're already doing. The value isn't in creating new evidence, it's in creating a verifiable chain between the evidence you already have and the software you ship.
Myth 2: "Workflow Contracts are just another policy language to learn"
Reality: Workflow Contracts define the minimum bar for what constitutes a complete build. Think of them as a schema, not a rulebook.
When you're trying to meet PCI DSS v4.0.1 Requirement 6.3.2 (which requires inventory of bespoke and custom software), you don't need another policy engine. You need to guarantee that every production build includes an SBOM. A Workflow Contract says: "This pipeline must produce these specific outputs before we'll sign anything."
Here's what that looks like in practice: Your contract specifies that builds must include a CycloneDX SBOM, a SLSA provenance attestation, and scan results from your SAST tool. If a developer pushes code that skips the SBOM generation step, the pipeline fails before signing. You're not writing complex policies, you're defining the required outputs.
The enforcement happens through Open Policy Agent evaluation, but your compliance team doesn't write Rego. They define what artifacts must exist. The policies validate that those artifacts meet your organization's standards, like "no critical vulnerabilities in dependencies."
Myth 3: "We should use Sigstore because it's the standard"
Reality: Sigstore is excellent for open-source projects and teams without PKI infrastructure. But if you're a regulated organization with existing certificate authorities and HSM-backed signing keys, you probably shouldn't hand your trust root to an external service.
Chainloop supports signing through Sigstore or your organization's own PKI. This matters more than you'd think. If you're subject to FedRAMP requirements or handling payment card data under PCI DSS, your auditor will ask who controls the private keys used to sign your software. "A public transparency log" isn't always the right answer.
Consider your threat model. Are you protecting against supply chain attacks from compromised developer machines? Your own PKI with hardware-backed keys gives you more control. Are you building open-source tools where public verifiability matters more than key custody? Sigstore makes sense.
The flexibility to choose your signing method means you can adopt supply chain attestation without restructuring your entire security architecture.
Myth 4: "First-class evidence support means the tool does the scanning"
Reality: When documentation says a tool supports "seventeen named evidence formats," it means the tool knows how to parse, store, and verify those formats, not that it generates them.
You still need your SAST scanner, your SCA tool, your container image scanner. What you get is a system that understands the difference between a CycloneDX SBOM and an SPDX SBOM, knows how to verify signatures on SLSA provenance, and can store Snyk scan results with the same chain of custody as your build artifacts.
This distinction matters when you're answering audit questions. An auditor asks: "Show me the vulnerability scan results for the version of your API deployed to production on March 15th." Without structured evidence storage, you're searching through CI logs and hoping the timestamps match. With proper evidence handling, you query for the attestation bundle tied to that deployment and get every artifact from that build.
Myth 5: "Once we implement this, we're compliant"
Reality: Tools provide evidence that you followed a process. They don't make the process correct.
You can collect perfect attestations for a build process that deploys unpatched dependencies every week. You can sign every artifact with hardware-backed keys while running tests that don't actually verify security controls. The attestations prove you did what you said you'd do, they don't prove what you did was sufficient.
ISO 27001 requires you to maintain evidence of your security controls. SOC 2 Type II audits verify that controls operate effectively over time. Supply chain attestation gives you the evidence layer, but you still need to design controls that actually reduce risk.
If your Workflow Contract requires a vulnerability scan but doesn't enforce a threshold for acceptable risk, you're collecting evidence of a weak process.
What to do instead
Start by mapping what evidence you actually need for your compliance requirements. Not what's theoretically useful, what specific artifacts will answer specific audit questions.
For PCI DSS v4.0.1 Requirement 6.3.2, you need an inventory of custom software. That's an SBOM per build. For Requirement 11.6.1, you need evidence of change detection on payment pages. That might be integrity measurements of your deployed code.
Then look at your current CI/CD pipelines and identify where that evidence already exists. You're probably generating 60% of what you need and discarding it because there's no structured place to keep it.
Define Workflow Contracts that enforce the minimum evidence set for each type of build. Your API services need SBOMs and vulnerability scans. Your frontend deployments need those plus integrity hashes. Your infrastructure-as-code changes need policy validation results.
Choose your signing approach based on who needs to verify your attestations and what your key management requirements are. If you're shipping to external customers who need to verify provenance, public transparency logs help. If you're proving compliance to auditors who trust your internal CA, use your own PKI.
Finally, remember that the goal is verifiable compliance, not comprehensive data collection. Every piece of evidence you capture should answer a specific question that an auditor, customer, or incident responder will ask. If you can't articulate why you need an artifact, you probably don't.
