PDFfiller can offer an audit trail to show by whom and when the signature is created. With PDFfiller's new feature "Signature Verification", you can get instant signature verification and sign your file digitally and securely. PDFfiller will work as a trusted third party, or a certificate authority (CA). When you and your client draw, upload or capture a signature, PDFfiller will instantly provide a digital certificate to validate your electronic signature. With PDFfiller's cloud technology, you can also get a digital certificate when accessing and working on your PDF files from an iPad, iPhone and other mobile device.