I am a Physics master's student trying for PhD. During my summer internship I worked on a project in a research lab. During the work I found a a few inconsistencies with work done by the Post-Doc and I also redid the analysis with new data. Because of this I was included as second author in a presentation given by the Post-Doc in a conference (our common guide was the third author). I do not have any "proof" as such for this, except for the keynote presentation. How am I supposed to mention this in my CV? I mean, if it was an actual paper I can give a link to the paper, however the conference presentations do not have any such things I think. Is there any official way to do this or should I just give my guide as a referee so that admission committee will contact the guide in case they need to verify this?
Because it was presented in a conference I am hoping it'll be published at some point in the future(we are still working on the project), but I have to apply for few institutes with next few months, and the project won't be completed by then.