According to the source, a single whale reportedly shorted $751M notional of ETH and realized over $89M profit within one day (source: X post, Oct 11, 2025). The source adds the same trader then opened a 10x BTC short worth $92M, implying roughly $9.2M initial margin under standard 10x conventions (source: X post, Oct 11, 2025). On a $751M notional, an $89M daily PnL equates to about 11.8% of notional, highlighting the trade’s size and potential market impact if executed on major derivatives venues (source: X post, Oct 11, 2025). The source does not provide venue details or independent verification; traders should confirm with exchange order book, funding, and liquidation data before acting (source: X post, Oct 11, 2025).

According to @OnchainLens, a trader dubbed Bitcoin OG closed a 12x short on $ETH for a $72.33M realized profit and closed most of a 10x short on $BTC for $81M realized gains with $7M unrealized profit remaining during the market drop, corroborated by on-chain dashboards at hyperdash.info/trader/0x2ea18c23f72a4b6172c55b411823cdc5335923f4 and hyperdash.info/trader/0xb317D2BC2D3d2Df5Fa441B5bAE0AB9d8b07283ae; source: @OnchainLens and HyperDash.