How to Verify a DOI

A DOI (Digital Object Identifier) is a permanent address for one specific scholarly work. Unlike a normal URL, it does not break when a journal moves its website — it always resolves to the same paper. That permanence is exactly why a DOI is the single most reliable thing to verify in a citation.

• Take the DOI — it looks like 10.1038/s41586-020-2649-2 — and paste it after https://doi.org/ in your browser.
• A valid DOI redirects you to the actual article page on the publisher's site.
• Confirm the page that loads is the same paper your citation describes — same title, same authors, same year.
• Sanity-check the format: every DOI starts with "10." followed by a registrant code, a slash, and a suffix.

If doi.org returns "DOI Not Found", the identifier does not exist in the global DOI registry. There are three common causes: it was mistyped (a transposed digit), it was fabricated (often by an AI tool that invented a plausible-looking string), or — rarely — the work is brand new and not yet registered. The first two are far more common.

If the DOI fails but the paper is real, you can recover the correct one:

• Search the exact title in CrossRef or Google Scholar — the real record carries the real DOI.
• If you have the article URL, resolve it to a citation and read the DOI off the result.
• If you have the paper itself, the DOI is usually printed on the first page or in the footer.

A missing DOI just means a reader has to search for the source. A wrong DOI actively sends them to the wrong paper — or to a dead error page that makes the whole reference look fabricated. If you cannot verify a DOI, it is safer to confirm the rest of the reference and drop the DOI than to leave a broken one in place.