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).

According to @FarsideUK, Ark’s US spot Bitcoin ETF ARKB recorded a US$5.6 million net outflow on Oct 9, 2025. Source: Farside Investors tweet dated Oct 9, 2025 and Farside Investors Bitcoin ETF flow tracker at farside.co.uk/btc. Redemptions in US spot Bitcoin ETFs are conducted in cash, so net outflows typically require the fund to sell bitcoin to meet redemption proceeds, transmitting selling pressure from ETF shares to the underlying market. Source: ARK 21Shares Bitcoin ETF ARKB prospectus filed with the SEC and SEC spot Bitcoin ETF approval documentation. Traders monitor consecutive daily flows, ETF premiums or discounts versus NAV, and the BTC spot–CME futures basis to confirm whether ETF flow direction aligns with short-term momentum and liquidity shifts. Source: iShares education on ETF premiums and discounts and CME Group education on futures basis. For cross-issuer context, consolidated US Bitcoin ETF flow data and disclaimers are available for comparing ARKB’s activity with peers on the same date. Source: Farside Investors Bitcoin ETF flow tracker at farside.co.uk/btc.