Invalid, he wanted to buy my account to scam with, after I told him i dont want to deal with him he asks me to a sign a message and give him my private key to my bitcoin address.
Can you sign a generic message here just to ensure?
As, now, it looks like you may both be trying to scam at the moment.
(Preferably signed from your oldest staked address which can be found from bctalkaccountpricer.info).
any message to prove he is owner, before I can give him my offer to buy his account for sig campaign