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I don't think it will be enough to trust on OP. Although I am not expert of HTML coding but most likely scammer could edit all deposit history by HTML edits.
It can be done through developer tools in Chrome, but what about sharing his details with 0 money in his account with a trustworthy escrow here? Anyone with good trust can check and verify if the OP is speaking truth or not.
So something like screenshots will not appropriate for proof his legitimacy. Even he created video with it I will not trust him due to edit.
Check my comment, I said I'd never trust this guy even if he proves to have done it without any extra deposit because it needs superb luck to grab 80 BTC out of potato chips that took OP there and if I were OP, I am not so stupid to share such an exploit to even my daughter, eh!
Only solution is share his screen of devices with any trusted user of this forum. Then likely I could trust his tricks although I believe it will never happen.
I must agree here because OP was last active on Aug 6, 2019 and there is no chance he'd come back if he really have found an exploit.
1: He's a newbie, so don't take this as a price for his guide that you'll be paying, but a donation that he will take and leave you behind.
2: Already got a red trust, so I don't see anyone trusting this person.