The standard diversification argument for crypto portfolios is that altcoins are less correlated to Bitcoin than they are to each other, so you spread risk by holding many of them.

That argument has a hole in it, and the current numbers show it.

Total crypto market cap is $2.469T. $BTC dominance is 60.20%. $ETH dominance is 10.38%. So roughly seven tenths of the entire market sits in two assets, and $BTC alone is six tenths.

Now look at what happened today when that market repriced: $BTC -2.19%, $ETH -5.73%, XRP -5.60%, $SOL -2.87%, DOGE -2.85%, ADA -3.05%, NEAR -4.94%, HYPE -5.07%, ZEC -3.94%, SUI -3.60%. Broadth: 455 of 723 USDT pairs fell more than 2%.

That is not diversification. It is one factor.

The practical implication is uncomfortable but useful: in a broad risk-off, alt positions do not offset each other. They concentrate the same exposure with more downside torque, because alts fall harder than the asset they are correlated to. $ETH fell 2.6 times as much as $BTC. NEAR fell 2.25 times as much.

So how do you actually reduce risk? By reducing beta, not by adding names. Options in order of bluntness: reduce position size, move exposure toward the highest-liquidity assets, shorten the holding period, and use a hard invalidation level rather than an average-down rule.

Also worth remembering: correlation is not constant. It rises exactly when you need it to fall, which is during a broad liquidation. The diversification that works in calm markets is the diversification that disappears in the one week you really need it. #BTC #Altcoins #RiskManagement

Process notes from my own research. Not financial advice.