How it works¶

BlindProof keeps a private notebook alongside your writing. Every time you save your manuscript, it quietly writes a single line in that notebook: on this date, at this time, a document of roughly this length existed. It does not copy down what you wrote. It never sees your words. Once a day, it takes that page of the notebook to an independent public registrar, which stamps it with the date in a way nobody can fake or change later — not even us.

If one day someone questions whether you really wrote your book — whether an author sat down over months and drafted it, revised it, lived with it — you can hand them a single PDF. That PDF shows your writing timeline: the days you worked, how the word count grew, when you paused, when you pushed through. It comes with a small checking tool anyone can run to confirm the dates are genuine and were not invented after the fact.

Your manuscript itself stays on your computer. We never have it. Your publisher never has it. Nobody but you does.

The short version¶

flowchart LR
    A[Your computer<br/>your manuscript] -->|a fingerprint only,<br/>never the words| B[A private notebook<br/>kept for you]
    B -->|once a day| C[A public registrar<br/>stamps the date]

Your words stay on the left. Only a mathematical shadow of them travels to the right.

How the PDF is tied to your book¶

Each time you save, BlindProof takes a fingerprint of what is on the page — a short string calculated from your actual words. Change a single comma and the fingerprint changes completely. Two different manuscripts cannot produce the same fingerprint. That fingerprint is what gets recorded and timestamped. Not your words — just the fingerprint of your words.

When you deliver the book, you send your publisher two things: the manuscript itself, as always, and the PDF from BlindProof. Your publisher runs the little checking tool on your manuscript. It calculates the fingerprint of the file you sent and looks for that exact fingerprint inside the PDF's timeline. If it is there — on, say, the entry for 14^th March at 4pm — then the registrar's stamp on that day proves that this exact manuscript, down to the last comma, existed on that date. A different novel of similar length would not match anything, and the check would fail immediately.

A forger would need to have calculated the fingerprint of the finished novel before writing it, then travelled back in time to get it stamped on the right dates. The public registrar will not backdate anything. The timeline either genuinely belongs to your manuscript, or it does not — there is no middle ground. Your words stay private, but a mathematical shadow of them is frozen in time, in public, where nobody can tamper with it.

Why a public registrar¶

The stamp that matters is not one we provide. The registrar is a public service used by researchers, journalists, and lawyers around the world for exactly this kind of purpose — a way of proving that a digital document existed on a particular day, without having to trust any single company to remember. Even if BlindProof disappeared tomorrow, the stamps on your timeline would remain valid and checkable, using the same public record.

That independence is the whole point. Nothing in your proof bundle depends on BlindProof being here in ten years.