Definition. 90D Coin Days Destroyed (blue) is the 90-day rolling sum of Coin Days Destroyed for Ethereum, plotted with price (grey). It shows the amount of coindays that have been destroyed over the past 90 days.

Technical. The trace is a simple rolling aggregation of the daily CDD series:

• CDD-90 = sum(CDD, 90)

Interpretation. Coindays are destroyed in proportion to how long the moved coins were held, so CDD weights spending by both volume and dormancy. Summing over a 90-day window filters out the day-to-day noise of individual large transactions and reveals the quarterly trend of lifespan expenditure: elevated CDD-90 indicates that older coins are being revived and spent — behavior typical of distribution phases — while low readings indicate that the older supply is dormant and holding behavior dominates.

Notes. Built from Coin Days Destroyed (CDD). The annual counterpart is Coin Years Destroyed (CYD).