There is no proof. There is evidence:
1. No sign of existence on the internet before November 2013.
When there was a discuss about this question in CoinMarketCup topic somebody put a link to the BCN website. If i'm not mistaken, there was an announcment (2012) about BCN launch.
No there wasn't. There was no announcement. It was released in secret and purposely hidden, I and many others have checked the archives for anything related to Bytecoin and
found nothingLying makes you seem even more pathetic PizzaTraveler...