Before the pitch

Date the deck before the room sees it.

Pitch files travel: email, Drive, WeChat, Slack. A dated SHA-256 fingerprint does not prove the idea is novel, but it does show those exact PDF bytes existed by a UTC time you can look up later.

• Export the final PDF you will send. Stamp that file — not a working Keynote.
• $4.99 pay-per-file includes a second stamp for the next revision.
• Keep the original PDF. Anyone can re-hash it on /verify against your certificate.
• Pair with NDAs and email headers when the stakes are high.

$4.99 — buy one, get one. Stamp the PDF you actually send.