Is there any way of betting on a price fall? I can't find any derivatives for that.

I am willing to put down 30% collateral for the bitcoin's current value.
The contract will guarantee the repayment of the same amount of bitcoins on completion, so you get back whatever you borrowed. If bitcoin goes up, you made that increase anyway.
Interest payments will be made monthly until expiry of contract in money/bitcoins.
I can demonstrate my ability to repay and willing to sign a contract to that effect.

Comparing to other loans: I can buy a house for just 5-20% deposit.

The collateral cannot be near the current value of the bitcoins, because I can simply go and buy the bitcoins myself and pay no interest.

I have physical gold and silver bullion. Can negotiate how that will work in practice.

Hi, I want to loan 5-10 bitcoins for 1-2 years at a negotiable interest rate. Based in the UK, can provide collateral, happy to sign a contract, etc.

I have a company that's got a patent granted on an engineering process. I was wondering if it’s possible to do an ICO for a share of the patent. Once the shares are sold, my company (that is trading and making profit from the patent) will pay interest to the shareholders, until a bigger company comes along and buys the patent. The shareholders will then share the profit. Can this be done?