Spot bitcoin and ether ETFs collectively lost more than $520 million during a Wednesday session as higher Treasury yields reduced the appeal of risk assets. U.S. spot bitcoin ETFs recorded approximately $450.4 million in net outflows on Sept. 15, the largest single-day redemption since June, while BlackRock's IBIT accounted for about $144 million of the Wednesday outflows. Chainlink ETFs remained unchanged, and Solana ETFs attracted $1.3 million. Through mid-September, cumulative flows remained modestly positive at about $17 million despite the volatility.