Bitcoin Dominance

Dominance is simply Bitcoin's market cap divided by the total market cap of every tracked cryptocurrency combined, expressed as a percentage:

It moves for two reasons that look identical on the chart but mean different things: Bitcoin's price changing relative to altcoins, or capital literally rotating between them.

If Bitcoin is worth $1.2 trillion and the entire crypto market is worth $2 trillion:

Now suppose altcoins rally hard while Bitcoin is flat, lifting total market cap to $2.4T with Bitcoin still at $1.2T. Dominance falls to 50% — even though Bitcoin's own price didn't move. That's the key subtlety: dominance is a relative measure, so a falling line can mean "alts are outperforming," not "Bitcoin is falling."

Rising dominance has historically coincided with early bull-market phases and risk-off periods — capital moves into Bitcoin first as the most liquid, most institutionally accessible asset, or flees altcoins into Bitcoin as the relatively "safer" crypto asset during drawdowns.

Falling dominance has historically coincided with the later, more speculative stage of a bull cycle — often called "alt season" — when profits (and risk appetite) rotate out of Bitcoin and into smaller-cap alternatives chasing higher beta.

Read dominance as a rotation map, not a direction signal: it tells you where risk appetite is flowing within crypto, which is most useful for deciding Bitcoin-versus-altcoin allocation rather than whether to be in the market at all. Pair it with the Altcoin Season indicator, which measures the same rotation from the altcoin side, and always separate the two drivers — is dominance moving because Bitcoin led, or because alts did?

Dominance is one of the market-structure inputs behind Alphabit's Altcoin Season view. It also appears as a component in some composite sentiment gauges (the Fear & Greed Index includes a dominance term), which is one reason Alphabit treats it as context around the core Bitcoin Risk Model rather than a driver of it.

Dominance is sensitive to what's included in "total market cap" — the proliferation of new tokens, stablecoins, and low-float/high-FDV assets over time has structurally diluted the denominator in ways unrelated to any real shift in capital allocation, so long-run comparisons across eras should be read with caution. Different data providers also define the total differently, so absolute dominance levels aren't always comparable chart to chart.