BTC is up, so why are there fewer positions in the futures market? When you look at BTC price alongside Open Interest, you'll notice the two haven't been moving in sync recently. The yellow line represents BTC price, while the green bars show futures Open Interest. At the beginning of the year, BTC futures OI was close to 800,000 BTC. By late September, it had dropped to around 650,000 BTC, nearing this year's low. But BTC's price hasn't returned to its early-year levels—in fact, it saw a significant rise in Q3. In other words: prices are higher, but there are fewer positions remaining in the futures market. OI is actually pretty straightforward. As long as a futures contract remains open, it contributes to OI. When positions are closed, OI decreases. However, a drop in OI doesn't directly mean bearish sentiment. Whether it's long or short positions, closing them reduces OI. What OI really tells us is this: this BTC rally hasn't been accompanied by an increasing pile-up of leveraged positions. So when you're analyzing the market, price can tell you "how much BTC has gone up," but OI can tell you how many positions are still willing to stay in the game. The most noticeable change in this chart is: prices are higher than before, but there are fewer chips left on the table.