LIFAIO™

Seal Documents & Invoices · Seal LIFAIO™

An invoice changed after you sent it? Your customer will know before paying.

The problem

A fraudster intercepts or imitates a supplier’s invoice, changes the bank details, and the customer pays the wrong account. A PDF that looks right proves nothing. A verification link in the email can itself be fake.

How it works — for your business

  1. In your Seal portal, choose any file (PDF, Word, image or another format) and give it a reference. It never leaves your computer: its SHA-256 fingerprint is computed in your browser.
  2. Seal gives you a code such as D-7KQ4M9TX and this sentence for the invoice or email:
    Document Seal code: D-7KQ4M9TX — verify it at seal.lifaio.com/doc. Click nothing.
  3. Optionally, set a validity period in days.
  4. If the invoice is cancelled or reissued, cancel it or mark it replaced in one click, giving the new code. Every later verification reports this.

How it works — for your customer

  1. Type seal.lifaio.com/doc yourself. Click no link received with the document.
  2. Enter the code and select the received file. It stays on your device.
  3. Read the result:
    • Authentic — identical, byte for byte, to what the issuer sealed. The verified issuer’s legal name, reference, date and public phone number are shown.
    • Does not match — altered (bank details, amount…) or re-saved, converted, printed and scanned. Do not pay; call the issuer at a number you already know, not the one on the document.
    • Cancelled — the issuer cancelled this document.
    • Replaced — the issuer replaced it with another document; verify that one.
    • Expired or Unknown code.

For finance and IT teams

Batch API: POST /api/documents-sceller — up to 1,000 fingerprints per call, computed on your side. No file is sent.

Cancel/replace API: POST /api/document-revoquer.

Only the organisation’s account holders can seal or cancel. Delegated managers cannot.

Verification is rate-limited per IP address.

What Seal keeps

The fingerprint, reference, dates and status. Never the file or its content.

Languages and documentation

Verification, help and technical documentation are available in 18 languages. UK patents pending.

Help · Technical documentation