You're basically asking for red trust.
Am looking for a loan of one BTC
You are still new to ask much for 1 btc. Your post is lacking explanation as to why you're looking for a loan. You need to specify your needs and reveal your collateral, so legitimate loan provider will check if your loan is acceptable or not.
He hasn't even signed an address. Wait... He hasn't given an address.
I can probably give this loan if you can give collateral and sign a message. Someone asking for a bitcoin should be able to do that.