Are you stupid ? What's wrong with you ? I will send the BTC first and you are reporting me ? Who the fuck do you think you are ? You motherfucker. Trust me that i will make 100 posts where i will post that you are a stupid guy and nothing more. How stupid do you think you are ?
xetsr is highly trusted on the forum send him the 5 btc and he will send it back and then buyers will have proof your not trying to scam.
That's not proof. Him signing a message isn't proof either. All it would do is prove he has the BTC, doesn't prevent him from scamming anyone at all.
He would have sold out very quick if he was legit. I mean who isn't looking for BTC at those rates right now?