According to the source X post dated Oct 12, 2025, an $11B Bitcoin whale allegedly opened roughly $900M in BTC and ETH short positions, and the post provides no exchange identifiers, transaction hashes, or auditable position data (Source: the cited X post, Oct 12, 2025). For validation, traders should confirm unusual net short exposure via objective metrics such as a sharp rise in aggregate open interest, funding rates turning negative on BTC/ETH perpetuals, and a widening spot-futures basis on major venues (Source: Binance Futures metrics, CME Group futures data, Deribit Metrics, CoinGlass). Until independent confirmation emerges, consider conservative sizing and defined-risk hedges like put spreads instead of naked shorts to navigate news-driven volatility (Source: Deribit Insights risk management guides).