when making a fake video of Donald Trump, why make him say exactly what he is saying in a "normal" day? :-D

Deep fake means we are in deep trouble. Maybe news in the future will need a higher level of proof to be broadcasted. Unfortunately this will be difficult in social media and such, but is it possible to make a "trouth blockchain" were objective facts everybody agrees upon is proving, disproving or giving the news an "unkown" status?