I was there. The crowd wasn't really that large at all, and I am referring to the conference as a whole, not just the Peertracks presentation. There may have been 150 people in the audience at the time, but that would be a generous estimation.
There was a good presentation and brief demo of the Moonstone wallet/app. One of the issues I had with the conference is that many of the presentations, including this one, were limited to about 20 minutes, including any Q&A, for which there was not time after their talk. This wasn't a very good venue at all to talk about their product at length; and although I got a chance to talk to Eddie and the gang afterward, I don't know how much traction Peertracks got at all.