Coin Days Destroyed (CDD)
Sum of 'age' of spent coins: measures long-term holder activity.
CDD = coins × days since last move. High CDD = old coins moving = long holders selling (distribution). Low = only fresh coins move = no HODL selling. Spikes precede big price moves.
In plain words
Each coin has an 'age' = days untouched. CDD multiplies coins × their age at the moment of being spent. High values mean someone moved BTC held for years, as long-term holders are selling. CDD spikes often precede bigger corrections.
Example
Nov 2021 (ATH 69k): CDD spiked 6x avg, 2017 whales selling. Week later -25% correction. Nov 2022 (bottom): CDD at min.
Also known as: coin days destroyed, wiek spalony, destroyed days