The proof you are seeking is one big reason why there might be law indeed but there mightn't be justice. And it's highly unfortunate that people tend to defend injustice due to ignorance and naivety.
My years of trading show clearly that the market is manipulatable, and with evidence, some makers had been sanctioned in the past. This takes me to the crypto market, why not? In this highly unregulated market, if more regulated ones could still be caught in such an act, you don't need a soothsayer before knowing that it happens.
To manipulate Bitcoin can't be attractive much with the current capitalization, but I do wonder how some shitcoins indeed behave, and I don't need proof that they are being manipulated due to their low liquidity.
Of course I'm not referring to low marketcap shitcoins lol because that's easy as hell to manipulate.
Bitcoin on the other hand, sure there are a lot of entities attempting to manipulate it. But the question is — in what manner? And how will you exploit the fact that they're trying to manipulate it? Exactly, we have little to no idea.