Which was created following the laws of nature which were in place before the beginning of space and time. The same laws of nature which predestined beings that know and create. There is the proof you are so desperately seeking.There likely can't be any proof so it'll stay a theory. But it can only be said that the BB was the start of our current universe.Maybe the BB wasn't the beginning but part of an endless cycle of expansion and collapse?
That's possible, but I've seen no evidence to support that theory.