
Revived Supply 3+ Years sums the BTC spent each day from outputs that had not moved for at least three years. It isolates activity from a more seasoned part of supply than the one- or two-year thresholds, in BTC per daily observation.
High readings mark the release of coins held idle for several years; a low reading means little of that supply was spent. On December 4, 2018, about 225,035 BTC qualified for this group, almost matching that day's two-year reading of about 225,172 BTC. The event was therefore overwhelmingly concentrated in coins already at least three years old.
Long coin age cannot identify an original owner, a miner or a sale. Custody migrations can move very old coins without changing their economic owner, and a larger stock of aged coins changes the background scale. The series starts with zeros because three-year-old coins could not exist during Bitcoin's first three years.
It helps locate the age of the activity. Nearly equal readings mean most BTC counted in the two-year group also passed three years, as on December 4, 2018.
No. Three years is the time since the last on-chain move, not necessarily since mining. The coin may have changed hands many times before its latest dormant spell.
No. Each date shows BTC spent that day after the minimum dormant period. A quiet day after a spike does not reverse the earlier transfer; it means fewer qualifying coins moved on the later day.