Proof Ladder
How to rank proof from self-asserted statements to third-party verification so you can judge how credible a claim is and what evidence layer may still be missing.
Proof has levels
A statement, screenshot, metric, public record, and external endorsement do not carry the same trust.
Layer 1 — Statement
A statement is a self-asserted claim. It tells the reader what you are claiming, but does not verify it.
Layer 2 — Artifact
Artifacts are traces of work: design files, code, reports, proposals, workflows, release notes, and screenshots.
They show that something existed, but not necessarily ownership or outcome.
Layer 3 — Source
Source creates provenance: repositories, analytics, public pages, signed documents, client records, and dated logs.
Layer 4 — Result
Results show consequence: changed metrics, adoption, completed delivery, fewer errors, or faster decisions.
Strong results need baseline, timeframe, scope, and attribution.
Layer 5 — Third-party Verification
Attributed testimonials, public launches, press, awards, external reviews, partner records, or independent references add trust because the signal does not come only from you.
Framework: Statement → Artifact → Source → Result → Third-party Verification
Not every claim needs all five layers.
The purpose is to know which important claims require stronger proof.
Do not maximize proof for everything
A small claim about a deliverable may need only an artifact. A major claim about revenue impact, scale, leadership, or reputation deserves a higher burden of proof.
Applying this on Forwork
Forwork can show a Proof Level for each claim or Project: Statement, Artifact, Source, Result, Verification.
This helps people and AI understand evidence strength rather than seeing an undifferentiated attachment list.
Conclusion
Do not only ask, “Do I have proof?”
Ask: “What level is this proof, and does this claim deserve a stronger one?”
Statement → Artifact → Source → Result → Third-party Verification.