This splits the market’s total value between Bitcoin and everything else, and reports Bitcoin’s portion of it. The share rises when Bitcoin outperforms the field and falls when the field outperforms Bitcoin, entirely regardless of whether anything at all is going up.

That last point is where most of the misreadings of this view begin. It is a relative measure dressed in the clothes of an absolute one, and the disguise is convincing.

What it actually measures

Three ways of reading the same series answer three separate questions: where the share currently sits, how quickly it is moving, and how unusual the present level is when set against its own history. The three regularly disagree, and the disagreement is worth more than any of them alone.

A climbing share while everything advances is ordinary rather than paradoxical. All it reports is that Bitcoin gained faster, which sits perfectly happily with every asset on the other side of the split gaining too, sometimes a great deal.

The composition of the field affects the reading directly. New assets arriving and old ones fading out change the other side of the split without Bitcoin having done anything at all, which puts a slow drift into the series that has nothing to do with performance.

Dominance rising says nothing at all about direction

The reading gets used as a market signal in both directions, sometimes in the same conversation: dominance rising means a flight to safety, dominance falling means risk appetite returning.

Both readings can be true on different occasions and neither follows from the number itself. The share is a statement about who is winning among the assets, and the market as a whole can be rising, falling or perfectly flat at any value of it.

What it does not tell you

The other side of the split is a moving target. Assets entering and leaving the measured universe change the share without any capital having moved at all.

Total value counts coin that never trades at all. A large share can rest on supply that has not moved in years and would not move for any price on offer.

It says nothing about the size of the market. The share can sit unchanged while the whole thing halves, because it describes a split and not a total.

It is dominated by a handful of the largest assets on the other side. The long tail of the field contributes almost nothing to the figure, whatever it does.

How to read it

Rotating to Bitcoin. Capital is concentrating into Bitcoin, or leaving the field faster.

Balanced. Neither side of the split is gaining ground on the other.

Rotating to alts. Money is dispersing outward, away from the single largest asset.

The Relative Performance dashboard draws BTC Dominance alongside Alt Season Index, BTC vs Field and Valuation Bridge.

Common questions

What does the share actually measure?

How much of everything this market is worth belongs to Bitcoin. The figure goes up when Bitcoin gains faster than the rest and down when the rest gain faster, whichever way prices are going.

Why do the three settings disagree?

Because each puts a separate question to the same series: where the figure stands, how quickly it is travelling, and how unusual it looks beside its own past.

Can it rise in a rising market?

It can, and it frequently has. The figure only reports who gained faster, which is untroubled by everything gaining at once.

What moves it besides performance?

Composition. Assets joining and leaving the measured universe change the other side of the split without Bitcoin having done anything.

Does a high share mean the market is large?

No. The share can sit completely unchanged while the market halves or doubles, because what it describes is how the total is split rather than how big the total happens to be.