今天该怎么看：延续昨天的谨慎基调，没有出现能让人放心的证据，反而衍生品市场给出了新的偏空信号——比特币未平仓合约（还没平仓的期货合约总量，能反映有多少新资金在建仓）24小时上升2.4%，同时资金费率从0.0086%降到0.0022%，以太坊资金费率更是直接转负。这个组合意味着有人在趁着下跌新开空单押注价格继续跌，而不是被动的杠杆清洗，是主动的看空押注。
支撑这个判断的其他证据：第一，比特币现货ETF最新一天（7月31日）净流出2.65亿美元，贝莱德IBIT一家流出1.23亿美元，这是流出之后重新出现的一次流出，还谈不上连续趋势，今天的数据要等美东17点后才公布；第二，加密总市值2.24万亿美元，处于过去7天区间下沿的历史低位，说明大盘整体在收缩；第三，比特币市占率56.2%，也处在7天低位，加密圈内部的钱并没有从山寨币转回比特币来避险；第四，交易所资金流出现分化——比特币过去一周有净流入交易所的迹象（潜在抛压），以太坊却是净流出（走向冷钱包囤币），这是本周的背景信号，不是今天波动的直接原因。
需要留意的反面信号：伊朗方面传来利好，特朗普取消了原定的军事打击计划，油价应声跌至三周低点，国债收益率也随之下行，这对风险资产是个实质缓和；不过股市（纳斯达克+0.19%、标普+0.59%）和加密市场今天走势并不同步，说明这波下跌更多是币圈内部（比特币现货被Strategy持续减持、Coldcard盗币事件发酵）在起作用，不能简单归因于宏观风险偏好回落。
接下来最该盯的：一是今晚美东17点后公布的ETF流出数据，能否连续印证机构撤退；二是Coldcard盗币事件损失是否继续扩大（目前逼近1.14亿美元，已进入美国常规金融盗窃案损失规模前列），会不会进一步打击自托管信心、逼更多资金转向ETF等托管渠道；三是比特币未平仓合约继续上升还是回落，判断这波空头加仓是不是会真的把价格砸出新低。
The bottom line: today extends yesterday's cautious stance, and there's no new reassuring evidence — instead, derivatives data adds a fresh bearish wrinkle. Bitcoin's open interest (the total value of outstanding futures contracts, a gauge of fresh positioning) rose 2.4% over 24 hours while funding rates fell from 0.0086% to 0.0022%, and Ethereum's funding rate flipped negative outright. That combination means traders are opening new short positions to bet on further downside — active bearish positioning, not just leveraged longs getting forced out.
Other evidence backing this view: Bitcoin spot ETFs saw a $265 million net outflow on the latest reporting day (July 31), with BlackRock's IBIT alone accounting for $123 million — this is the first outflow after a brief inflow, not yet a confirmed multi-day trend, and today's flow data won't post until after 5pm ET. Total crypto market cap sits at $2.24 trillion, at the low end of its 7-day range and historically depressed, pointing to broad contraction. Bitcoin's market share is 56.2%, also near a 7-day low — money isn't rotating from altcoins back into bitcoin as a safe haven. Exchange flows are also diverging: bitcoin has seen net inflows to exchanges over the past week (a potential selling-pressure signal) while ether has seen net outflows (coins moving to cold storage, a sign of accumulation) — this is background context for the week, not today's trigger.
Countervailing signals worth noting: Iran de-escalation news is genuinely supportive — Trump called off a planned strike, sending oil to a three-week low and pulling Treasury yields down with it. But equities (Nasdaq +0.19%, S&P +0.59%) didn't move in step with crypto's decline today, suggesting this pullback is driven more by crypto-specific forces — Strategy's continued bitcoin selling and the still-spreading Coldcard wallet exploit — than by any broad pullback in risk appetite.
What to watch next: tonight's ETF flow data (posting after 5pm ET) will show whether institutional outflows are becoming a pattern; whether the Coldcard exploit's losses keep growing (now approaching $114 million, already among the largest financial thefts of its kind in the US) and further erode confidence in self-custody; and whether bitcoin's open interest keeps climbing, which would confirm fresh short positioning is actually driving prices toward new lows rather than fading.
未来24小时最该盯的是今晚美东17点后公布的比特币ETF流出数据，如果继续净流出，说明机构买盘确实在退潮，价格可能进一步承压；如果转回流入，说明上周五只是单日波动。同时要留意比特币未平仓合约是否继续上升——这是判断"新空单在加码做空"这个信号是否会兑现为实际下跌的关键。另外，Coldcard盗币事件的损失和影响范围还在扩大，如果继续发酵可能进一步打击自托管信心；伊朗谈判周一重启，如果传出实质进展，可能给风险资产情绪带来支撑，但目前看这类宏观利好还没能真正传导进币价。
The most important thing to watch over the next 24 hours is tonight's bitcoin ETF flow data, posting after 5pm ET — a continued net outflow would confirm institutional buying is genuinely retreating and could pressure prices further, while a swing back to inflow would suggest Friday's outflow was just a one-day blip. Also watch whether bitcoin's open interest keeps rising, which would confirm the fresh short positioning we're seeing today is translating into actual further downside rather than fading out. Separately, the Coldcard exploit's losses and affected-wallet count are still growing, and further escalation could deepen the hit to self-custody confidence. Iran talks resume Monday — real progress there could lend some support to risk sentiment, but so far this kind of macro good news hasn't meaningfully fed through to crypto prices.