A few days ago, lots of the twitter peeps that I follow were encouraging people to go on over to BitMEX and short the crap out of BTC. Many people ended up getting rekt with dead cat bounces. Good luck to you. I hope that your "system" is a real harpoon whale killer.

Needless to say, many of those same twitter peeps now have the wind knocked out of their sails. Reminds me of Moby Dick. The whale wins in the end.

I'm not shorting via a CFD position on an exchange, via margin trading.
I am doing a manual short using SBD to keep my purchasing power while BTC/USD potentially goes down. It's less risky that way (and no counterparty risk either):
https://steemit.com/money/@profitgenerator/profit-from-crypto-crash