Just now, altcoins suddenly took a big hit in market cap, far exceeding the average correlation volatility with BTC. This is so weird! Currently, the $800 billion market cap is the last line of defense for altcoins. This level is super critical—can it hold? I was wondering why my $SOL dropped so much that it triggered an alert, way beyond BTC's correlation range! Turns out all the altcoins are crashing together. Could this be some ETF-linked operation?!