3Exemplar ledger — Researchundecided records · tag or archive each one
4Coverage reportwhere we looked for this player · honest gaps
5Rules of the roadbuilt into the tool
Rows marked "WorthPoint/…" would need a data license from WorthPoint before GradedInk operates commercially. The tool opens on all records: verification tiers (A: a named authenticator attests the signature · B: vetted by the auction house that sold it · C: only the seller says so) are a lens, not a gate — the best dating evidence is often unauthenticated multi-signed paper. Production year ≠ signing year: production year is shown on every record as the primary research field; a signing year appears only with stated evidence and a confidence tier, and where it can't be proven a bracket gives the earliest and latest the signature could exist. Event-dated items (programs, ticket stubs) get production dates only — the event does not prove when the ink was applied. Images are never stored or hot-linked — both buttons open the source's own pages. True cross-source relists are collapsed to one record to keep counts honest, but never deleted (the summary bar shows and restores them). Reprints, facsimiles, wrong-signer matches and unsigned lots are excluded outright — they can never be exemplars. Group lots that don't name the signer in the title are kept and marked "confirm signature is present": a 1950 Lakers team ball won't say "Slater Martin" anywhere, and that is exactly the material worth your eye.