You can buy put options on deribit.com (with a huge spread, mind you). https://www.deribit.com/main#/options https://www.deribit.com/main#/options It's effecti

You can buy put options on deribit.com (with a huge spread, mind you). https://www.deribit.com/main#/options https://www.deribit.com/main#/options It's effectively shorting selling, except you know in advance how much you stand to lose (what you paid for the option), as opposed to borrowing bitcoins and selling them, and then having to buy them back at some unknown price in the future.