Price Boundary

Both levels are built from an idea called coin days. A coin earns one coin day for every day it sits untouched, and spending it destroys everything it has accumulated. A coin that sits for three years and then moves destroys far more than one that moved last week. Weighting activity this way puts the emphasis on what long-term holders do and filters out the constant churn of coins moving back and forth.

Running that across all of Bitcoin's history produces Transferred Price, roughly a lifetime average of what spending has cost. Both levels on the chart come from it, in opposite directions.

Terminal Price, the ceiling, is Transferred Price multiplied by 21, matching Bitcoin's 21 million coin cap. That rescaling puts historical behavior onto the terms of the full eventual supply, rather than letting recent activity dominate simply because more coins circulate now.

Balanced Price, the floor, is Realized Price minus Transferred Price: what owners paid, less what spending has already worked through. It has historically marked the point where a bear market has fully cleared out its sellers.

The chart shows price between Balanced Price and Terminal Price. The band is deliberately wide. It is the range price has spent essentially all of its time inside, not a precise target.

The two edges differ in character. Balanced Price looks backward, describing what owners paid net of what has been spent. Terminal Price is a rescaling of past behavior onto the full supply, and reads better as an upper bound than as a prediction.

In Bitcoin's earliest completed cycles, price rose above Terminal Price at the peak. In each cycle since it has fallen short, and by a wider margin each time, so the ceiling reads less like a level price is due to reach and more like a marker of how much the market has cooled between cycles. Its author has made the same observation.

The band is wide on purpose. It is the range price has spent essentially all of its history inside, so being within it says very little on its own. What the indicator offers is the position between the two edges, not the edges as targets.

Both edges rest on a single number, Transferred Price, so they are not two independent readings. Terminal Price is that number multiplied by 21 and Balanced Price is Realized Price minus it, which means anything distorting coin days destroyed moves the floor and the ceiling together rather than one against the other.

Terminal Price is a young indicator with few cycles behind it, and its author has noted it can cross price well before the actual peak arrives.

Both levels assume old coins eventually move on-chain. Bitcoin that migrates into ETF or custodial structures and then sits still distorts the coin days signal they are built on.