I covered all my shorts yesterday, but have now re-opened them plus some, so I am putting my money where my mouth is in case anyone wants to call me on that. And by short I mean negative Bitcoins, not just sitting in fiat.
What is negative Bitcoins? I always thought that short means sit on fiat waiting to increase bitcoin position later as they fall in price
I mean leveraged short CFD's ... I make fiat when the price goes down. To me holding BTC is long, holding fiat is 'flat'. 'Short' means selling borrowed BTC or a CFD (or ETF

Where do you trade these instruments?
I would like to know this as well