**[Bitfinex Alpha: Bitcoin's Key Support Level Faces a Test, Altcoin Activity Surges]** Odaily Planet Daily News: The Bitfinex Alpha report reveals that Bitcoin has been consolidating within the $77,100 to $81,300 range over the past 20 trading days. The current price is near the critical support level at the lower end of the range. If it breaks above $81,300, the low trading volume above this level could propel the price quickly to $86,500. In the options market, protection has shifted to contracts expiring on September 18 ahead of the Federal Reserve's interest rate decision. The report also notes that while Bitcoin's volatility has decreased, altcoins have shown strong performance. All 29 major cryptocurrencies posted gains last week, with Polkadot rising 43% and Zcash up 42%. For the first time this week, the open interest in altcoin perpetual contracts surpassed that of Bitcoin. Historically, such occurrences have often been accompanied by market correction risks.