OK.
If btc price goes down we get 1025 btc back and you get some from value difference.
If btc price goes up we get 1025 btc bad and you have to pay some due to value difference.
How in earth are you going to earn anything if we hold btc in escrow?Edit: Ah, you are not asking for a loan, you are asking for a CFD. Forget my questions

Edit2: I still don't get it. Since first post says 100% guaranteed, we get 1025 btc back no matter what happens?