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E-SIGNATURES

Verify a document signed with SoloWOS

Check whether a PDF was signed with SoloWOS E-Signatures and hasn't changed since. Your browser computes the file's SHA-256 fingerprint and sends only that, so the file never leaves your device.

What the result means

  • Signed PDF: the file is the final signed version, byte for byte. You see when it was completed, how many people signed, and whether it carries the SoloWOS digital seal and a timestamp.
  • Document as sent for signature: the file is the original, before anyone signed. The signed version is a different file.
  • No match: the file wasn't signed with SoloWOS, or something changed it after signing. Saving a PDF again in another app is enough to change its fingerprint.

The check never shows names, email addresses or document titles. Who signed, and when, is in the audit trail on the last pages of the signed PDF and in its certificate of completion.

Check the digital seal in Adobe Acrobat Reader

When everyone has signed, SoloWOS seals the PDF with its own certificate (PAdES). The seal covers every page, the audit trail included, so a PDF reader can tell whether anything changed afterward, without this page.

  1. Open the signed PDF in Adobe Acrobat Reader (free for Windows and Mac).
  2. Open the Signatures panel. Acrobat offers it in the bar above the document when a PDF carries a signature.
  3. Find the signature by SoloWOS E-Signature Seal. Acrobat should say the document hasn't been modified since the signature was applied: no byte changed after SoloWOS sealed it.
  4. Acrobat shows the seal's certificate as not trusted. That's expected: it's SoloWOS's own certificate, not one on Adobe's trust list. What matters is that Acrobat says the document wasn't changed, and that the certificate's SHA-256 fingerprint (in the signature's properties, under the certificate details) matches one listed below.

The seal also carries a timestamp from an independent timestamp authority whenever one answered, and the certificate of completion is sealed the same way.

SoloWOS seal certificates

These are the SHA-256 fingerprints of the certificates SoloWOS has sealed documents with. A document keeps the certificate it was sealed with, so older ones stay on the list.

Loading the seal certificates…

Need documents signed yourself? SoloWOS E-Signatures sends your documents for signature in the order you set, and returns each one sealed, with its audit trail inside.