According to @StockMKTNewz, the US stock market opened lower today, signaling a risk-off start to the session; source: @StockMKTNewz on X, Dec 1, 2025. Since 2020, BTC and US equities have frequently moved in sync, with correlation tending to rise during stress regimes, which can raise downside beta for BTC and ETH when stocks sell off; source: International Monetary Fund (Adrian et al., 2022) and Kaiko Research (2023–2024). Crypto traders should monitor BTC and ETH around the US cash open, as liquidity and volume concentrate during US trading hours, often amplifying intraday volatility when equities weaken; source: Kaiko Research (2023).