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ChainProofFile integrity

Has this folder changed? One fingerprint tells you.

Seal a delivery, a backup or a shipment: you keep a single fingerprint. Later, ChainProof tells you file by file what is identical, modified, missing or added.

€19Opening soon

incl. VAT · one-off · no subscription

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● chainproof.html — offline
Screenshot of ChainProof: three files sealed with their manifest
SHA-256fingerprint of every file
4states: identical, modified, missing, added
0network requests
2languages, EN and FR
Features

Seal, chain, re-check.

01

Seal

Drop files or a whole folder: a manifest (JSON or sha256sum format) and one overall fingerprint.

02

Chain

Link each seal to the previous one to follow versions; a tampered manifest is caught at verification.

03

Re-check

Load the folder and the manifest again: each file is marked identical, modified, missing or added.

What you get

One file, two languages.

  • chainproof.zip: the page in English and French, a read-me and the licence.
  • Opens in any recent browser, even offline.
  • No account, no installation, no data sent.
  • The version you buy and fixes to its bugs.
What it does not do

Honest limits.

  • A fingerprint proves a file is identical, not when it was created: the manifest date comes from your clock.
  • For a legally binding date, have the overall fingerprint timestamped by a third party. It is not an official filing.
  • Keep the overall fingerprint elsewhere (e-mail, paper): a manifest on its own can be replaced.
FAQ

Frequently asked questions

What is it for, in practice?

Showing that a delivery handed to a client has not changed, checking a backup, making sure a shipment arrived intact.

Is it proof of prior art?

Not on its own: the fingerprint proves integrity. For a date, have the overall fingerprint timestamped by a trusted third party.

When can I buy it?

Soon. Sign up below: one single message when sales open.

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