CoinMeta data: According to CoinDesk, the current price of Bitcoin (BTC) is $82,486.39. Although the overall volatility has significantly decreased, the price fluctuations this year have been more intense than during the bear market in 2018. In 2026, Bitcoin recorded 10 days of price fluctuations exceeding three standard deviations, which is more than the 8 days in 2018. This indicates that, although Bitcoin's annualized volatility is about 46%, which is much lower than 84% in 2018, it still faces the risk of extreme price fluctuations. The analysis points out that investors need to consider these extreme situations when using volatility-based risk models to avoid potential significant losses.