By default, signatures are validated when you open a PDF. An icon appears in the signature field on the document page to indicate the signature status. Further details about the status appear in the Signatures panel and in the Signature Properties dialog box.
Third-party signature handlers may provide alternate methods of validating signatures. Check the documentation included with your third-party digital ID.
The digital signature icon along with the name of the field in the Signatures panel indicate the presence of an unsigned signature field.
The blue ribbon icon indicates that the PDF is certified