I'd really like to know exactly what the original chart represents. I know what everyone *thinks* it means but I think there is some assuming going on.
What I mean is, this link
http://bfxdata.com/sentiment/longshort.php shows a different picture.
I used bitfinex a long time ago, and from what I recall swaps are just you saying that whatever you have on account there, you are prepared to loan out to someone else. So from this it looks like the inference here is that because BTC swaps are at a high that there is more short interest than usual.
I have 2 things that need to clear about about that:
1. What the chart isn't showing is what the USD swaps are currently. I know when I first looked at OP's chart I assumed that was the blue line, but its not - the blue line is the rate (of interest) on swaps. Which, as you would expect is slightly lower, due to the increased availability of BTC swap.
So, On its own all the chart tells me is that more BTC is being loaned out to others than before. It doesn't tell me if this is outsized compared to USD swap interest.
2. Another thing I recall, and I'm sure I'll be corrected if it doesn't work this way. Is that the leverage anyone has available to them is some dollar value based on calculated account value x some leverage factor. The account value is calculated based on total USD and total BTC at their market value in a given instant.
I also seem to recall that you can then use your available leverage to go long *or* short. The implication here being that USD swap and BTC swap are just 2 components that make up the total swap that is being utilised by everyone who is currently long or short BTC on leverage.
If that is the case - and I repeat I may have this wrong, its been a while since I used bitfinex! - then swap interest only really tells us about how active the market is, and says nothing about longs vs short interest.
Now if anyone can give me a cast iron guarantee (amidst the usual internet sea of unfounded opinions) that borrowed BTC can *only* be used to go short, and borrowed USD can *only* be used to go long then that clears up point 2.
Point 1 remains though, whats the USD swap like? are they both up? or is there some divergence - which would give us something more telling I think?