今天该怎么看：市场从昨天的"情绪修复"转向"避险防守"，美国和伊朗爆发直接军事冲突是最大的新变量，加密总市值24小时跌了2.35%到2.64万亿美元（处于过去7天区间的中下沿），比特币跌破多个新闻标题提到的7.8万美元附近，市场明显在收缩风险。
关键证据：美伊在霍尔木兹海峡附近互相打击，导致油价一度突破90美元，全球股市普跌，这是今天最大的新变量，直接压制了风险偏好；比特币ETF流出（8月28日单日再流出2.02亿美元，当前只是流出后的第一天，还未构成连续趋势）虽然是延续昨天讨论的话题，但结合今天的避险氛围，说明机构资金在地缘风险升温时更谨慎；恐慌与贪婪指数从62分（处于过去7天的最低点，此前区间65-74），说明尽管仍在"贪婪"区间，但这是过去一周里最不贪婪的一天，恐慌情绪正在悄悄加深；比特币主导率59.1%处于过去27天的历史高位，说明资金在避险时更愿意留在大币而不是山寨币里。不过也要看到反面证据：以太坊ETF连续12个交易日净流入的纪录仍在延续，Bitmine、Strategy、Saylor等机构大户本周都有新增买入动作，说明部分机构资金并未真正离场，只是比特币ETF这一条线暂时承压。
需要留意的反面信号：稳定币总市值24小时几乎持平（-0.10%），场外没有出现真正的资金撤离潮，说明这次下跌更像是避险情绪引发的短期收缩，而非资金大举出逃；衍生品方面比特币未平仓合约24小时小幅下降0.8%、资金费率略微上升，属于常规波动，没有看到极端杠杆出清信号。
接下来关注：美伊冲突是否进一步升级（油价能否稳住在90美元附近、是否有更多军事行动）将主导接下来24-48小时的风险偏好；同时留意下周五的美国非农就业数据和美联储对9月加息（目前市场定价加息概率58%）的表态，这将决定当前的避险情绪是短期反应还是趋势性转向。
Today's verdict: the market has pivoted from yesterday's mild sentiment recovery into a defensive, risk-off posture, driven by a fresh and material catalyst — the U.S. and Iran exchanged military strikes near the Strait of Hormuz. Total crypto market cap fell 2.35% in 24 hours to $2.64T, sitting in the lower-mid part of its 7-day range, and bitcoin slipped alongside global equities.
The key driver is geopolitical: the U.S.-Iran clash sent oil above $90 a barrel and knocked stocks lower worldwide, and that risk-off wave spilled directly into crypto. Bitcoin ETFs saw a second straight reporting day of net outflow (-$202M on Aug 28, still just the first day of a new outflow after a positive prior day — not yet a multi-day trend), which fits the broader risk-averse mood even though it's a continuation of a story already flagged yesterday. Fear & Greed sits at 62, which is actually the lowest point of its own past 7 days (prior range 65-74) — still technically 'Greed', but the least greedy, most cautious day of the week, meaning fear is quietly building beneath a still-positive label. BTC dominance at 59.1% is near a 27-day high, showing capital is consolidating into bitcoin rather than spreading into altcoins during the risk-off move — a classic defensive posture.
On the other hand, there's a real counter-signal: Ethereum ETFs extended their inflow streak to 12 consecutive trading days, and large holders like Bitmine, Strategy, and Michael Saylor have all made fresh purchases this week — so institutional demand hasn't broadly reversed, it's specifically the bitcoin ETF line that's under pressure right now. Stablecoin supply is essentially flat (-0.10% in 24h), meaning there's no sign of capital actually leaving crypto altogether — this looks more like a short, sentiment-driven pullback than a capitulation. Derivatives data backs this up too: bitcoin open interest (the total value of outstanding leveraged positions) dipped only 0.8% and funding rates ticked up slightly — normal noise, not a forced deleveraging event.
What to watch next: whether the Iran-Israel-U.S. situation escalates further — if oil holds near $90 or climbs higher, that's the dominant risk-off driver for the next 24-48 hours. Also watch Friday's U.S. jobs report and any Fed commentary on a September rate hike (markets currently price a 58% probability) — that will determine whether today's caution is a short-lived reaction or the start of a more lasting shift.
未来24小时最大的变量是美伊冲突会不会继续升级——如果油价继续冲高、军事行动扩大，市场大概率会延续今天的避险收缩，比特币可能继续承压；如果局势暂时缓和，今天的下跌更可能只是短期反应，市场情绪有望重新回暖。同时要留意周一比特币ETF流入能否恢复正值，以及以太坊12天连续净流入的纪录能否延续，这将说明机构资金到底是被地缘风险吓退，还是只是短期观望。稳定币总量目前没有明显流出，如果这个信号继续保持稳定，说明这次调整不是资金真正离场，更多是情绪性避险。
The biggest variable over the next 24 hours is whether the U.S.-Iran conflict keeps escalating — if oil prices keep climbing and military action expands, expect today's risk-off mood to persist and bitcoin to stay under pressure; if tensions cool off, today's drop looks more like a short-lived reaction and sentiment could recover quickly. Watch whether bitcoin ETF flows turn positive again on Monday, and whether Ethereum's 12-day inflow streak holds — that will show whether institutions are genuinely spooked by the geopolitical risk or just pausing to watch. Stablecoin supply hasn't shown real outflows yet; if that stays stable, it supports the case that this is a sentiment-driven pullback rather than capital actually leaving crypto.