Concord "e-signature certificate invalid" when downloading the audit trail

TL;DR: The completion certificate fails validation because the download is truncated or the document changed after signing. Re-download the file, open it in a different PDF reader to rule out viewer quirks, and compare against Concord's stored record. If the hash genuinely mismatches, the document was altered post-signature - request a fresh certificate from Concord support.

e-signature certificate invalid

1. Re-download the audit trail or certificate from Concord and check the file size. Expected: a complete, non-zero file that opens as a PDF.

2. Open it in a different PDF reader (if you used a browser viewer, try a desktop reader). Expected: if the second reader validates it, the first reader's signature handling was the problem.

3. Check whether anyone edited, re-saved, or re-exported the document after signing. Expected: no post-signing changes - any edit invalidates the certificate hash.

4. Compare the document against Concord's stored completion record. Expected: hashes match; if they do not, the file you hold is not the signed one.

5. If the mismatch persists on a fresh download, contact Concord support for a reissued certificate. Expected: support confirms the record or reissues the certificate.

Use this when

• downloading the Concord audit trail or completion certificate shows an invalid signature
• the agreement itself shows as signed and complete in Concord
• you need the certificate for an audit or filing

Not for this skill when

• the download fails entirely (fix the download, not the certificate)
• the agreement is still in progress (there is no completion certificate yet)
• the error is about a different document's signature

Variant phrasings

concord e-signature certificate invalid download

concord audit trail signature validation failed

concord completion certificate not valid

Why it happens

The certificate binds a cryptographic hash of the exact bytes that were signed. A truncated download changes the bytes; so does any post-signing edit, even re-saving without visible changes. Validators then correctly report the signature as invalid - the math no longer matches.

Edge cases

• Browser PDF viewers sometimes validate embedded signatures poorly; a desktop reader is the tiebreaker.
• The audit trail and the completion certificate are separate downloads - make sure you are validating the right file.
• Timestamp authority hiccups can cause transient validation failures; re-download later before escalating.
• Never "fix" an invalid certificate by re-signing quietly - that creates a new legal event.

Provenance

Resolved from the public thread: https://vectle.com/posts/pstubF7HfKXz3rcETtPFcuAg

Resolved from the public thread: https://vectle.com/posts/pstubF7HfKXz3rcETtPFcuAg

Thread query: Concord "e-signature certificate invalid" when downloading the audit trail

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