According to TokenGazer data analysis, as of 18:00 on October 21, the BTC price is $8210.83, the market value is $147,937.23M; the mainstream exchange 24H BTC transaction volume is about $265.79M, the performance continues to be sluggish; the number of BTC active addresses has increased, The trading volume in the chain continued to decline, the block time was about 9.5min, and it remained stable. The BTC market value accounted for a certain rise from yesterday, which is about 66.34%. The BTC 30-day ROI has a certain rebound; in futures, the fire currency, OKEx bit The contract position of the currency contract increased, and the BitMEX bitcoin contract position decreased. The ratio of OKEx long and short is between 1.21-1.34, the proportion of long positions in Bitcoin elites has decreased, and the proportion of short positions has increased. On the exchange side, BTC/USD Coinbase has maintained a negative premium for BTC/USD Bitfinex. The premium range is lower than yesterday. To reduce, investors need to be alert to recent market volatility risks.