After click on GRN Link following e - Payment Challan will open in pdf
format.
(See the following Screen and go through Instructions)
e - Payment Challan
Right Click on digitally Signed symbol Choose Validate Signature
Click on Signature Properties... Button
Signature Properties
Click on Show Cerificate Button
Certificate Viewer Popup will
open
Certificate Viewer
Click on Ok Button
See the above Signature Valid Mark.