今天该怎么看：上涨的底子还在，机构买盘和市场情绪都在往好的方向走，但情绪已经涨到接近过去一周的最高位置，短期追高的性价比在变差。
核心证据：恐慌与贪婪指数报71分，处于过去7天区间（31-72）的上沿，说明市场信心比一周前明显回暖，但也意味着现在已经不是"捡便宜"的位置了。比特币现货ETF昨天（8月21日）净流入3.08亿美元，连续第5天净流入，14天累计流入22.3亿美元；以太坊ETF连续第7天净流入，昨天1.84亿美元。机构买盘没有断档，这是行情比较扎实的一个支撑。稳定币总市值24小时又涨了0.31%，说明还有新钱在场外排队准备进场，不是资金枯竭的行情。链上数据也显示过去一周比特币和以太坊都在持续流出交易所（币被转去冷钱包囤起来），这是长期看多的供给面信号。板块上资金也在扩散——ZEC(Zcash)因为Grayscale推现货ETF的消息一天涨了25%左右，TRUMP和LIT等小币种也出现大涨，说明贪婪情绪已经从主流币扩散到更边缘的题材。
需要留意的反面信号：新闻提到这波反弹带有"逼空"性质（空头被强制平仓推高价格），这种上涨往往是被动的卖压消失，而不是主动的新买盘进场，涨得快也可能退得快。宏观面上，美国十年期国债收益率因为财政部的债券回购操作效果减弱而回升，市场担心的是通胀会不会卷土重来；伊朗和美国的制裁摩擦也没有完全平息。这些风险目前还没反映到币价里，一旦发酵可能会成为变数。
接下来要盯：一是ETF流入能不能继续维持在3亿美元以上而不是逐渐衰减，这是判断机构买盘是否真实可持续的关键；二是Jackson Hole全球央行年会（下周）和英伟达财报，这两个宏观事件可能左右市场风险偏好；三是情绪指数如果继续往贪婪区间深处走，警惕短期获利了结带来的回调。
Bottom line: the rally still has real legs — institutional ETF buying and sentiment both keep improving — but sentiment has now climbed to the top of its recent range, which means chasing the move here offers a worse risk/reward than a week ago.
The key evidence: the Fear & Greed Index sits at 71, near the top of its 7-day range (31-72), showing confidence has clearly recovered from a week ago — but it also means this isn't a cheap entry point anymore. Bitcoin spot ETFs posted a fifth straight day of inflows, $307.5M on August 21, bringing the 14-day total to $2.23B; Ether ETFs notched a seventh consecutive inflow day at $184M. Institutional demand hasn't broken stride, which is the sturdiest pillar under this move. Stablecoin supply also grew another 0.31% in 24 hours, meaning fresh capital is still queuing up on the sidelines rather than the rally running on fumes. On-chain data shows both BTC and ETH have seen a week of net outflows from exchanges (coins moving to cold storage), a supply-side signal consistent with longer-term accumulation. Capital is also broadening out across sectors — Zcash (ZEC) jumped roughly 25% on news of a possible Grayscale spot ETF, while smaller names like TRUMP and LIT also surged, showing greed has spread beyond the majors.
The counter-signal worth watching: news reports describe this bounce as partly a short squeeze — forced short covering that removes selling pressure rather than genuine new buying pressing in — and squeeze-driven moves that go up fast can also unwind fast. On the macro side, long-dated Treasury yields are climbing back up as the effect of the Treasury's bond buyback program fades, reviving inflation worries, and U.S.-Iran sanctions friction hasn't fully cooled either. None of that is priced into crypto yet, but it's a real risk if it escalates.
What to watch next: whether ETF inflows can stay above roughly $300M rather than fading, which will tell us if institutional demand is truly durable; next week's Jackson Hole central bank symposium and Nvidia's earnings, both of which could sway broader risk appetite; and whether the sentiment gauge pushes even deeper into greed territory, which would raise the odds of a short-term profit-taking pullback.
未来24小时最可能的情况是：整体偏多的格局延续，但情绪已经接近过去一周的高点，短期不太可能再有特别大的惊喜，反而要防一次获利了结式的回调。第一，盯ETF流入能不能继续保持在3亿美元以上的量级，如果连续跌破这个水平，说明机构买盘在减弱；第二，比特币这波涨势里有短空回补的成分，一旦这股力量用尽，价格可能会出现真实买盘不足的回落，需要看是否有新增的现货买盘接力；第三，关注下周Jackson Hole央行年会和英伟达财报，这两个事件可能改变宏观风险偏好，进而影响币价走向；第四，美债收益率如果继续因通胀担忧走高，可能会给风险资产带来压力。
The most likely scenario over the next 24 hours is that the broadly bullish setup holds, but with sentiment already near the top of its recent range, a big further surprise looks less likely than a profit-taking pullback. Key things to watch: first, whether ETF inflows can stay above roughly $300M — a drop below that level for multiple days would signal institutional demand cooling. Second, part of this bitcoin rally has come from short sellers being forced to cover; once that squeeze runs its course, the price could soften if genuine spot buying doesn't step in to replace it. Third, next week's Jackson Hole central bank symposium and Nvidia's earnings are both events that could shift broader risk appetite and, with it, crypto prices. Fourth, if Treasury yields keep rising on inflation worries, that would add pressure on risk assets generally.