Verify document
Check whether a signed PDF is identical to the one generated when the contract was completed. The file isn't uploaded: your browser calculates its digital fingerprint (SHA-256) and only that fingerprint is looked up.
Drag the signed PDF here
Verification confirms that the file hasn't changed since the contract was completed. It doesn't replace a government ID for the signers; the evidence for each signature is in the certificate at the end of the PDF.