Revived Supply ≥ 10Y measures how much BTC was spent on a given day after remaining inactive for at least ten years. It is the deepest threshold in this family, so it isolates rare reactivation from decade-old supply rather than ordinary long-term holder movement.
A higher reading means ultra-old supply has started moving again. A low or zero reading means those cohorts remained untouched. It is most useful beside the 5Y version and Spent Volume Age Bands, where the question is whether reactivation has reached the oldest visible layer of dormant supply.
The key caveat is extremity. This series will often be quiet, and that is part of its meaning. When it does move, it should be read as a structural old-supply event, not as a normal fluctuation in everyday market activity.
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