Coin-days destroyed per coin
dormant time spent, scaled to the size of the supply
The same measure as coin-days destroyed, divided by how many bitcoin exist, so that a spike in 2013 and a spike today can be compared without the growth of the supply getting in the way.
DefinitionCoin-days destroyed / circulating supply. Exact.
LimitThe coinblocks form of this, which the ARK paper calls concurrent liveliness, is the same series (r = 0.999) and is not published separately.