Paste a paper's DOI. Lucent asks Crossref, live, whether the DOI resolves and whether Crossref's metadata carries a retraction-related field. No account, no key, and no verdict beyond what Crossref actually records.
Lucent's checker calls Crossref's public works API for the DOI you paste. A response means the DOI is registered and resolves. Lucent then reads three fields in that response: update-to, updated-by, and relation entries typed is-retracted-by or is-retraction-of. If any of those name a retraction, we say so and name the field. If none do, we say that plainly too, we do not call it "safe" or "passed", we say the metadata carries no retraction-related field as of the moment you checked.
If Crossref has no record for the DOI at all, we say exactly that. An unknown result is never reported as a pass; that would be worse than no answer at all. This is the same integrity screen Lucent runs on every paper before it reaches an issue, and the same limit applies here: this checks disclosed facts, not whether a paper's conclusions are correct.
Brand-new papers in plain language, each screened for retractions and a live DOI before you ever see them. Three free every issue.
What is a paper retraction? · How to tell if a study is trustworthy · Latest issue · Privacy