I don't keep old wallets so I can't sign anything.
I was hoping that someone would just blindly send the 1BTC without asking questions.
Recently a lot of accounts got hacked so a proof that you are real BPB will good.1BTC is a big amount for everyone but with your reputation many users can send this everyone is worried because your password is changed recently so posting a proof will work good.
Regularly changing passwords is vital for good account security. This proves I'm more legit, if anything!