Did I do that? I thought I was just joking around (making up silly local rules and all)..


You signed https://www.blockchain.com/btc/address/18pTKHyCFyr5Gk3LHN4wKke1hUaT3wUnjb
Which is proof of funds, cool..
But I was thinking more along the lines of..
Old staked addy, for proof of identity, type of thing..

Pretty common procedure for authorizing deals where their is risk involved, to rule out possible hacked/sold accounts, make sure you are actually dealing with whatever identity you think you trust, and to be able to prove the other party accepted the signed terms incase you have to bust their balls about it in the future by showing the signed message..

But, I'm not suspicious that you are hacked, and I don't think you'll be coming back with "I was haxxored, I didn't agree to that!"..

You don't need to do anything, the deal is done..
I waved this formality in your case, but probably wouldn't for anyone else..