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BTC 
ETH 比特币突破87,000美元，市场情绪与资金面共振
比特币强势突破87,000美元大关，引发了自2024年以来最强烈的看涨社交媒体情绪。与此同时，近10亿美元的美国现货ETF净流入以及大规模的空头挤压，为此次价格突破提供了强劲动力。
9月21日，比特币突破了此前数月压制市场的阻力位，随后在周二早盘稳定在约85,200美元交易。目前，比特币在过去七天内涨幅约为10%，24小时交易量超过600亿美元。
社会情绪迅速转向乐观
此次突破迅速改变了市场参与者的持仓倾向。据Santiment数据显示，预测比特币及加密货币将“进一步上涨”的社交讨论量激增，达到自2024年以来的最强相对水平，彻底扭转了上周回调期间沉重的看跌情绪。
现货ETF单日吸纳近10亿美元
9月21日，美国现货比特币ETF录得9.99亿美元的净流入，这是自2025年10月以来最强的单日吸金能力。其中，贝莱德的IBIT以3.814亿美元领跑，其次是ARK 21Shares的ARKB（2.891亿美元）和富达的FBTC（2.388亿美元）。在比特币价格约为85,000美元时，总流入量相当于约11,750枚BTC。
The result marks a sharp reversal from September 15 and 16, when the funds lost a combined $746.3 million. The positive flow started at $159.5 million on September 17 and $433 million on September 18, and accelerated on Monday. Prior to the breakthrough, institutional demand had improved, with broader crypto funds attracting $1.3 billion in funding in the previous reporting week.
Corporate demand has also returned. Strategy disclosed on Monday that it had purchased $75.7 million worth of Bitcoin, with an average price of $79,670, and purchased 950 BTC, bringing its treasury holdings to 846,000 BTC.
Short squeeze accelerates breakthrough process
ETF demand is only one of the factors driving the market. As the prices of bitcoin and major altcoins rose sharply, about $648 million in short positions were cleared within 24 hours. Closing leveraged short positions requires buying the underlying asset, creating additional demand when prices rise. At the same time, cryptocurrency trading volumes surged by about 39%, giving the market more participation than a typical illiquid market clearing event.
The same mechanism appeared in Bitcoin early in this recovery. The breakthrough in August triggered a $3 billion short squeeze, when BTC broke through multiple resistance levels in succession.
Open contracts are rebuilt after short positions are cleared
最新一轮清算浪潮并未导致杠杆率下降。相反，全市场未平合约（Open Interest）增加了7.6%，达到约1,560亿美元，这表明随着旧空头被迫出局，新的衍生品头寸随之入场。比特币未平合约达到约258.4亿美元，以太坊升至169.7亿美元，Solana达到29.7亿美元。以太坊未平合约在周二盘中首次突破170亿美元大关，而在涨势中超过1.2亿美元的以太空头被清算。
价格上涨伴随未平合约扩大，表明杠杆正在回归而非消失。持续的现货和ETF需求可以支撑这种持仓，但不断扩大的衍生品基础也意味着，如果动能逆转，将有更多资本面临强制清算的风险。
比特币的社会背景变化同样迅速。上周下跌期间看跌预期占据主导，而最新一轮上涨已将关于高价的讨论推至近两年来最极端的水平。比特币在突破过程中曾触及87,000美元以上，随后在9月22日回落至85,000美元区间中段。
