What Your Artifact Verification Actually Contacts — And Why It Matters

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A developer building ProofLedger, a file-integrity tool that anchors SHA-256 hashes to Polygon and Bitcoin blockchains, shares lessons learned from the verification side of the system. Artifact verification involves three distinct checks: a local hash comparison, a structural commitment check, and an external lookup to confirm the commitment exists on a public ledger. A key risk is fail-open behavior, where verifiers silently pass checks even when external endpoints are unreachable, making a broken verification look identical to a passing one. Another concern is circular trust, where the only proof of validity is a JSON response from the same issuer whose claim is being verified, which offers no independent assurance. The author argues a truly self-contained proof should allow verification using only the proof file itself plus a single lookup against a publicly auditable source.

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