Details of evidence summary on OSS website

Hi,

I have been exploring OSS website for details of evidence summary, but apart from the following links, I couldn't find much info, I am looking for some description of an evidence summary which would explain what it basically contains. 

https://community.onespan.com/documentation/onespan-sign/guides/sender-guides/user/downloading-signed-documents-and-evidence-summaries#

https://community.onespan.com/documentation/onespan-sign/guides/feature-guides/developer/retrieving-audit-trail

https://community.onespan.com/forum/gmt-evidence-summary

Thanks,

Rajiv