US spot bitcoin ETFs took in $517 million on Aug. 19, their largest daily inflow since early May, while ether ETFs pulled in $189 million, their biggest since October 2025, per SoSoValue data. The flows confirm the demand that drove bitcoin above $69,000 and ether up 18% to around $2,250 in a broad rally.The move rewarded the returning-demand read that had been building through the summer's quiet tape. Bitcoin spent months boxed below $64,000 as ETF flows slowly turned positive, and this is the breakout that flow rebuild was pointing to. XRP and Solana funds added small inflows, while Hyperliquid's product was the lone outflow at about $2 million.The rally ran over the shorts. Bearish crypto bets lost a record $2.7 billion as bitcoin surged toward $70,000, the kind of liquidation-driven acceleration that fires when a market breaks out of a long range with leverage positioned the wrong way.The near-term question is whether the flows hold. A single day of large inflows confirms the breakout but not its durability, and bitcoin has faked out of this range before. A second and third day of ETF buying at this scale would mark the sustained institutional bid that's been missing since spring, while a quick reversal would put the $64,000 level back in play as support.