Bitcoin dominance (BTC.D) is one of the most overlooked timing signals in crypto — and most traders walk right past it.

Here is how the rotation works: when BTC.D is rising, capital is concentrating in Bitcoin. Altcoins bleed in BTC terms even when nominal prices hold steady. This phase typically follows a macro shock, a regulatory headline, or a new cycle launch when Bitcoin leads.

The inflection to watch is when BTC.D peaks and rolls over. Historically, that rollover — especially when confirmed by declining stablecoin dominance simultaneously — marks the opening window for altcoin outperformance. Capital that parked in Bitcoin starts seeking higher beta.

Sector rotation follows a sequence most cycles: large caps first ($ETH $BNB), then mid-cap infrastructure, then narrative-driven alts. The further down the risk curve, the later the rotation arrives — and the shorter its window.

The mistake most traders make: they wait for altcoins to confirm in USD terms before buying. By then, the BTC-denominated move — the real return — is already over.

Watch BTC.D on the weekly chart. When it forms a lower high after a sustained rally, that is the market telling you the rotation has begun. Price it in $BTC first, then translate to USD.

The signal is already in the chart. Most people just do not know what they are looking at.

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