title: How to add timestamp certificate without signature using setasign
body: <p>I want to add timestamp certificate using setasign. I have tried to do it using <code>timestamp()</code> method. But after adding it, when I am checking it, it's showing as signed certificate instead of Timestamp certificate. I have also tried <code>createTimestampSignature()</code> method &amp; result is same. Is there any way to add timestamp certificate without any signing certificate?</p>