关键信息：ETF 抵押品符合要求；资金大量流入，交易量巨大，但仍需警惕
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U.S. regulators approved rules allowing spot Bitcoin ETFs to be used as collateral for equity options and margin, letting institutional traders post spot BTC ETF holdings in options clearing systems.
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US spot Bitcoin ETFs saw a sixth straight day of net inflows totaling $199.4M, lifting post‑March 9 inflows to $962.8M. Top daily inflows: IBIT $139.4M, Fidelity $64.5M.
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MicroStrategy bought 22,000+ BTC in a single March day and 40,000+ BTC in two weeks; total holdings 761,068 BTC, avg cost $75,295, current value >$56 billion
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BTCUSD climbed ~10% last week as five-day ETF inflows hit $767M. Whale holdings reached a six-year high and stablecoin market cap set records. Traders watch ETF flows and $73,000.
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Adam Back warned BIP-110, a proposed 12-month soft fork, could let nodes freeze outputs, risk chain split at 50% hashpower, and harm user access and Bitcoin neutrality.
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BTCUSD surged toward $76,000 then retreated; roughly $491 million in crypto positions were liquidated, with about $326 million of those as short liquidations, per CoinGlass data.
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Registered investment advisors have bought Bitcoin for eight straight quarters, adding about $1.5 billion per quarter since spot BTC ETFs launched, though average allocations remain tiny.
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Citigroup cut its 12‑month BTCUSD target to $112,000 from $143,000, citing slower U.S. crypto legislation, weak on‑chain activity and lower expected spot ETF inflows.
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On-chain and exchange flow show renewed BTCUSD buying: 30-day volume delta flipped from negative to positive, ~+$21M on Binance and ~$14M on Coinbase, signaling net buy-side flows.
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BTCUSD volatility may rise around March 18–19 FOMC (hawkish comments risk), March 20 quadruple witching and Bitcoin options expiry, plus CME futures expiry on March 27 concentrating expiries.
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source: https://www.tradingview.com/news/tradingview:6745d3f6740d3:0-key-facts-etf-collateral-ok-strong-inflows-big-buys-warnings/