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Bitcoin
The distribution of unspent supply by the price at which each coin last moved — who paid what.
Why it matters
It maps the market's cost basis: the price shelves where large blocks of supply were acquired.
How it is built
Every unspent output grouped into price bins at its acquisition price. Colour splits profit (green) from loss (red) at today's price. Dated versions are frozen snapshots of past cycle moments.
What to watch
Bins below the current price are holders in profit; bins above it are trapped supply that tends to sell at break-even. Dense bins act as magnets and barriers for price.