Pro traders bullish sentiment softened after Bitcoin futures open 
interest fell in tandem with traditional markets which also recorded 
notable losses. 
Bitcoin (BTC)
 futures open interest just had its most extensive daily reduction in 
five months. Yesterday's 11% drop move caused more liquidations than May
 9 when BTC plunged 12.5% to $8,600.

BTC futures open interest in USD terms. Source: Skew
Skew
 data shows total open interest down by $653 million, reaching $4 
billion on Sept. 3. That figure includes perpetual (inverse swaps) and 
futures with set expiry on OKEx, CME, Binance, and remaining derivatives
 exchanges.
Yesterday’s move was the largest daily drop since the horrendous $1 billion cascading liquidation on March 13 caused a 50% drop in Bitcoin price. That same day marked the worst sell-off of the Dow Jones Industrial Average since 1987, a 10% drop.
The
 drastic correction might not have been such a record negative for stock
 markets, but the Nasdaq Composite tumbled 5%, led by Apple (AAPL -8%), 
Salesforce (CRM -7.8%), and Microsoft (MSF -6.2%).
Apple (AAPL) 
shares slid 8% on Sept. 3, causing its market capitalization to recede 
by $180 billion. This was the most extensive daily loss for a single 
company. By comparison, currently Bitcoin’s market capitalization stands
 at $194 billion.
The iPhone maker is currently valued at slightly
 over $2 trillion. Such an impressive figure could acquire the entire 
altcoin market, paying a 1.300% premium to the current $140 billion 
altcoin market capitalization.
The futures premium temporarily vanished
Futures
 markets tend to trade at a slight premium to regular spot exchanges. 
This is not something exclusive of cryptocurrencies markets, but rather a
 derivatives effect. By postponing the financial settlement for a trade,
 sellers usually demand more money.
This futures contracts premium
 indicator is known as basis and it usually ranges between a 5% to 15% 
annualized rate. Whenever the premium is positive, the market is 
characterized as in contango. On the other hand, a zero to negative 
future contracts premium is unusual and indicates bearish sentiment.

BTC 3-month futures annualized basis. Source: Skew
The
 above chart shows how significant yesterday's brief sub-$10K drop was 
on futures markets. Such a negative premium situation, known as 
backwardation, was last seen four months ago on May 10. Back then, 
Bitcoin (BTC) quickly recovered over the following three days, causing the basis indicator to regain positive territory.
The current 4% annualized basis can't be deemed bearish, although undeniably not bullish as the 10% level from three days ago.
Short-term options are back to bearish levels
Bitcoin
 option markets are also susceptible to significant price changes. 
Similar to the futures market, the recent BTC dip caused major risk 
aversion movements. Market makers often increase spreads during periods 
of volatility, thus, what happens on the following day is most telling.
The
 25% delta skew indicator compares similar call (buy) and put (sell) 
options side-by-side. The indicator will turn negative when put options 
premium is higher than similar-risk call options. Such negative skew 
translates to a higher cost of downside protection, indicating 
bullishness.
The opposite holds when market makers are bearish, causing the 25% delta skew indicator to gain positive ground.

BTC options 25% delta skew. Source: Skew
Although
 numbers are different depending on how far those options expiry is, 
short-term ones usually display a more considerable impact. Yesterday's 
sharp Bitcoin (BTC)
 drop caused the 1-month 25% delta skew to rise above 10%. As the above 
chart shows, ranges from -10% (slightly bullish) to +10% (somewhat 
bearish) are usual.
It seems premature to conclude that options 
markets are displaying bearish sentiment, especially when analyzing 
longer-term options. Nevertheless, large traders and market makers seem 
to be risk-averse right now, at least for pricing downside protection 
options.
Bitcoin derivatives remain healthy
Despite
 the Bitcoin futures open interest drop, it's aggregate notional value 
of $4 billion remains higher than two or three months ago. The same can 
be said by the current futures 4% premium (basis), which is far from 
bearish backwardation levels.
One should keep in mind that 
cryptocurrencies markets are incredibly volatile, and negative stock 
market swings also impact investors. No further evidence is needed after
 the two most largest BTC futures liquidation events happening on the 
exact same day of historical stock market crashes.
Those events 
prove that even uncorrelated markets may eventually reach peaks and 
valleys at similar times regardless of their different drivers. The 
current global macroeconomic scenario seems to be the most dominant 
force driving risk assets, including Bitcoin.
source link : https://cointelegraph.com/news/sub-10k-bitcoin-price-caused-653m-open-interest-drop-largest-since-march 
