but to make it clear, i need to claim that i own x ammount of bitcoins to join a 'certain group'. that's it
So the message won't be "Dear IRS, Trance104 owns this address filled with legit money"?
Shady at best to be honest. He could use it to lure people into whatever he tells them because he has some signed message having that much btc on the address.
Who falls for that? I can't think of a single way where a signature from an empty address adds credibility, and if someone shows many different signatures from many different emptied addresses he has no credibility left.
sign a message
then send back your money to your original wallet and sell me the wallet after that
If whatever you're planning to do accepts this, why don't they just ask you to sign from the original wallet?
I'm tempted to do this, 5% interest on my Bitcoins sounds very nice. But it seems very shady too. I guess you can't post what message you want to be signed?
Addition: I just noticed you didn't post for 3.5 years before you opened this thread.