Bitcoin Coin Days Destroyed Stats

One "coin day" accrues for each bitcoin that sits unmoved for one day — 10 BTC held for 100 days accumulate 1,000 coin days. When those coins finally move on-chain, their accumulated coin days are "destroyed" and counted in that day's CDD. So CDD does not measure how many coins moved, but coins moved weighted by how long they were dormant — old coins carry far more weight than young ones.

For each transaction: CDD = coins spent × days since those coins last moved. Summing all transactions in a day gives daily CDD. Example: one coin dormant for 10 years destroys ~3,650 coin days — the same as 100 coins that sat for only 36.5 days.

Long-term holders are typically the most experienced, lowest-cost-basis cohort. Low and flat CDD means old coins stay asleep and supply is tightly held. A sudden spike means long-dormant coins woke up and moved — historically clustering near bull-market tops (old hands distributing to newcomers) or capitulation events. Everyday churn of young coins barely registers.

Low & steady: holders are inactive — typical of bear-market accumulation or early bull phases. Sustained rise: old supply is loosening; after a big rally this is a distribution warning. Extreme one-day spikes: often exchange cold-wallet reshuffles or whale custody moves — check the news before assuming a sell-off. CDD only proves old coins moved, not that they were sold; pair it with exchange-inflow data for confirmation.

Alongside holder behavior, watch short-term leverage via BTC liquidations and funding rates.