VellumproofVersion history · Writing rhythm · Sealed proof
Prove you
wrote it.
Vellumproof keeps every version of your manuscript as you write — word counts measured from the real files, a cadence graph of your writing life, and a tamper-evident record you can hand a publisher.
works with .docx, .rtf, .md, and .txt — no new writing tools to learn
A finished file proves nothing — anyone can paste 80,000 words and call it a draft. A history is different. It shows the book growing, day by day, in a record no one can quietly rewrite.
How it works
From first draft to verifiable proof
Bring the files you already write
Word documents, Markdown, plain text — drop them in as you go. Vellumproof reads the manuscript itself, so every word count is measured from the actual text, never from what anyone claims.
reads · manuscript.docx / ch01.md / notes.txt
Watch your rhythm take shape
A book grows at a human pace: a few thousand words a day, over weeks and months. Your cadence graph and daily activity squares make that rhythm visible — and the rhythm itself is evidence.
cadence · 1,900 words a day, most days, for months
Every version, sealed in sequence
Each version you save is timestamped by our clock — not yours — and chained to the one before it. The timeline can't be reordered, backdated, or quietly swapped; any tampering breaks the chain.
sealed ⟶ 9f3a…c41d ⟵ linked to the version before
Hand over proof, not promises
Export a signed, machine-verifiable record and a shareable proof page. A publisher or contest can confirm your timeline is intact without ever touching your account — or your drafts.
verify · signature valid · chain intact ✓
What's inside
A vault built for manuscripts
Version history
Every draft you've ever saved, kept for good. Go back to Tuesday's chapter — or last spring's — and download it exactly as it was.
Prose diffs
See what changed between versions as sentences, not code — insertions and cuts marked the way a copyeditor would mark them.
Counts & cadence
Honest numbers, measured from the text: totals per version, words per day, and the long shape of your writing life.
The proof page
A page you can hand to anyone who asks the hard question: the timeline, the seals, and a plain verdict — intact, or not.
An honest note
We won't oversell it.
A patient cheater who drip-feeds AI text in believable daily chunks can mimic a real writer's cadence. So Vellumproof's record is deterrence-grade evidence, not cryptographic proof of human authorship — it raises the cost of faking from one paste to babysitting a fake for weeks. Every export says so plainly. Stronger proof (edit-stream capture) is coming with the Editor.
Pricing
One manuscript, free. Forever.
Every vault starts free — one manuscript, every version kept for good, no time limit. For more than one manuscript at a time, five dollars a month keeps the whole shelf sealed the same way.
The longer your vault runs, the stronger your proof.
Every writing day becomes another sealed page in the record. There's no better day to start than today.
Start your vault — freeSee a sealed manuscript — a real one.