Let's quote this as payment proof.
Why you just paid if @op did not confirm this he will take your offer?
No proof of ownership that he is the real account owner this is not the correct way to fill loans!
true but there is not correct way and less than 2 mins research will prove the address is mine iv had it as my default bitcoin address since 2013. some people ask for signed messages and others do a bit of background checks. the main reason i dont like to sign things is because my wallet remains on a secure separate computer.