BTC dominance is the hidden clock of every altcoin season — and right now, the structure matters more than the level.

Here is how the rotation actually works:

Phase 1 — BTC leads. Capital flows into the highest-conviction, lowest-risk asset first. Dominance climbs. Alts bleed in BTC terms even if they hold USD prices.

Phase 2 — ETH activates. Ethereum is the liquidity gateway for the altcoin ecosystem. When $ETH starts outperforming $BTC consistently — not just a day or two, but a sustained shift in ETH/BTC — that is the first confirmation signal.

Phase 3 — Sector rotation cascades. Capital does not flood all alts equally. It moves by narrative: large caps first, then mid-caps with live products, then speculative micro-caps last. Chasing the tail end of a rotation is how most retail loses gains.

Phase 4 — Dominance breaks structure. A BTC dominance breakdown from a multi-week consolidation range — confirmed by rising altcoin market cap share and increasing DEX volume on non-BTC pairs — is the broadest alt-season signal available.

What to watch: ETH/BTC weekly trend, total altcoin market cap ex-BTC, and $BNB ecosystem TVL growth as a leading appetite signal. These three together give you a more honest read than any dominance chart alone.

Altcoin season is not a single event. It is a sequence. Knowing where you are in the rotation changes your strategy entirely.

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