We have proven to two separate media organizations that we are behind these attacks by giving them advanced notice of our next target. We find the speculation that we are not behind these attacks and/or that we are CIA/NSA/FBI or even wikileaks themselves to be downright comical.
We gave @wlpress a 5 minute advanced notice of our next attack to take down there backup mirror(http://mirror2.wikileaks-press.org) on August 10th. We also gave a 30 minute advanced notice of our attack on the President of Ecuador's website to the german tech publication Gulli (http://www.gulli.com/news/19466-antileaks-ddos-angriffe-als-protest-gegen-wikileaks-2012-08-08). The logs of both servers will show an attack precisely when we said it would occur. These are irrefutable facts.
In the end we cannot prove individually to every person that doubts our claims that we are behind these attacks. There are a lot of people who still don't believe we landed on the moon. We feel we have nothing left to prove to anybody.