I don't think he'd need to prove himself, this video is proof enough he has woken up and is ready to take the journey to his own noticing.
We can do like the chans, tell him to put something that's not strange but obviously out of place in the background of his videos to signal he got the message and we can upvote and get him leveled real quick.
They did that with Felix (Pewdiepie) a while back when someone claimed to be him was shitposting around and he fucking did it, the mad lad.
I'm pretty sure a couple posts will be enough.
QRD?
Literally just what I said. Someone claiming to be Felix was shitposting on 4chan, so when someone said "Alright, slick, if you're really Pewdiepie then turn one of the plushies in the background of your next video around and upside down" and he did it.
They named a specific plush and exactly how it would be manipulated to show he was telling the truth, and Felix did do it. Proving that one of the most influential youtubers of the time was, in fact, a chan member and hadn't forgotten their internet roots.
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