The manuscript is yours. Now you can prove it.

Nobody writes a novel in one sitting. You write it in false starts and deleted scenes, in sentences rearranged eleven times before they sound like you. The ValidDraft desktop app follows that rhythm as you work, then seals each finished chapter with a certificate: quiet, verifiable proof that a person put those words in that order.

Get the Mac app

Requires macOS 10.15 or later. Universal build — runs natively on both Apple Silicon and Intel Macs. Windows build coming at launch.

Sealing, chapter by chapter

Finish a chapter, seal it

Every chapter gets its own certificate the moment you call it done. The proof builds up as you write, so there's no uploading a finished book and just hoping for the best.

One master certificate

When the manuscript is complete, every chapter seal is bound into a single signed master certificate. Anyone, an agent, an editor, a reader, can verify it with a short code.

Liveness that stays home (coming soon)

Soon you'll be able to optionally confirm you were at the keyboard with an on-device check. Only a digest will ever leave your device, no video is recorded, stored, or sent. Ever.

Everything in the Author tier

$69/year

Founding Author Rate

One plan for working writers, priced like a hardcover a season.

Unlimited verified articles/month
Up to 10,000 words per article
Desktop app for Mac & Windows
Long-form manuscripts, chapter by chapter
Up to 500,000 manuscript words/year
Signed master certificate with Merkle root

Built for novelists. Welcome to memoirists, poets, screenwriters, and anyone else whose name goes on the spine.