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MnemoSign

Have a PDF signed on this screen, and keep the proof.

An NDA, a rights transfer, a quote: each person draws or types their signature on your computer. MnemoSign takes the SHA-256 fingerprint of the PDF and files a proof dossier. Months later, Check a PDF tells you whether a file is the one that was signed.

The cartridge id is @mnemosyne-plugins/mnemo-sign.

Open it​

Once the cartridge is installed, MnemoHub's Launch App opens it in its own window, and Run on Canvas puts it on your canvas.

Sign a document​

  1. Document

    Choose a PDF to have signed, or drop it on the window. MnemoSign shows the pages, the size and the fingerprint. Give it a Title and a Client (optional).

  2. Signers

    Under Who signs, type each person's Name. The email is optional. Add a person for more.

  3. Signatures

    Each person in turn picks Draw or Type the name, ticks I have read « title » and I sign it, then presses Sign.

  4. Seal and file

    MnemoSign reads the PDF again. If it changed since it was chosen, nothing is sealed. Otherwise the dossier is written and the screen says Signed and filed.

The last screen offers See the certificate, Open the signed PDF and Open the folder.

The Signed list​

Signed lists every dossier, grouped by Clients, with a search box. Each dossier carries a check of its proof file:

  • Intact: the proof has not changed since it was sealed.
  • Altered: preuve.json was edited after sealing.
  • Unreadable: preuve.json cannot be read.

Check a PDF fingerprints a file you pick. When it matches, MnemoSign names the signed document, the day and the signers. The same file always gives the same fingerprint.

What the proof says​

The proof records which document (its SHA-256), who signed, how (drawn or typed), the words they accepted, and when.

The time comes from the computer's clock. The certificate says so: Not timestamped by a third party. No key signs the proof. A second fingerprint, of the proof itself, shows whether it was edited later.

Where your data goes​

Dossiers go into MnemoSign's app folder, Mnemosyne Apps/MnemoSign, next to your vault root. One folder per client, one folder per document:

<client>/<YYYY-MM-DD title>/<document>.pdf     the signed PDF, same bytes
<client>/<YYYY-MM-DD title>/preuve.json        the proof
<client>/<YYYY-MM-DD title>/certificat.pdf     the printed certificate
<client>/<YYYY-MM-DD title>/certificat.html    the certificate, PDF joined

A document without a client goes under a folder for no client. MnemoSign never overwrites a dossier: a second one with the same name on the same day gets (2).

Each sealed dossier also adds one line to MnemoSign's own vault: the title, the day, the signers, the client and the fingerprint. That vault is walled off from the rest of your memory until you open it in the vault manager. If the vault write fails, the dossier is on disk all the same, and the screen says Dossier filed, but not written into memory.