I will supply this, but you need collateral, and I wont go first, we use escrow.
I am winner of 1 BTC. That's my collateral.
You may or may not receive it. I suggest you wait for it as your terms basically suck.
I will repay as soon as John K send me the Bitcoin. But if John K never show up or is dead then you assume this risk. I will not pay back if John is dead or running.