You can validate a signature to verify the signer and the signed content when you receive a signed document. It helps ensure that the signer’s certificate exists in your list of trusted identities and confirm if the signed content has been modified after it was initially signed. See Setting up digital signature validation.

When a digital signature is validated, an icon appears at the upper-left corner in the digital signature field, indicating the validation status. The verification details appear in the Signatures panel and the Signature Properties dialog box. See View verification details in signatures panel for details. By configuring verification preferences in the Preferences dialog box, you may enable automatic validation when the document is opened. See Set signature verification preferences for details. 

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