According to the source, a claim is circulating that BlackRock’s spot Ethereum ETF purchased 78,920 ETH worth $363.2M on Sept. 15; traders should verify this against BlackRock iShares’ official daily holdings disclosure, SEC EDGAR filings, and NSCC creation basket files before positioning, source: BlackRock iShares; U.S. SEC EDGAR; DTCC/NSCC. If official data confirms a ≥70k ETH net creation on that date, this implies material net inflows that can tighten spot–futures basis; monitor CME front‑month ETH futures basis, perpetual funding rates, and the ETH/BTC spread for confirmation signals, source: CME Group; major derivatives venues’ public funding data. Cross‑check aggregate spot ETH ETF creations/redemptions and shares outstanding across issuers to distinguish rotation from new money, source: issuers’ daily holdings pages; Cboe/Nasdaq listing data.