Every Bitcoin transaction leaves a trace on the blockchain. But not all transactions are equal. When a coin that hasn’t moved in years finally appears on-chain, that event carries a weight that a freshly purchased Bitcoin simply doesn’t have. Coin Days Destroyed (CDD) is the metric that captures exactly this dynamic: the movement of old, dormant Bitcoin.
What Are Coin Days?
Every unspent Bitcoin output accumulates “coin days” while it sits idle. The math is straightforward: multiply the number of Bitcoin by the number of days since it last moved on-chain.
One Bitcoin held for 30 days accumulates 30 coin days. Ten Bitcoin held for 365 days accumulates 3,650 coin days. The longer Bitcoin remains unspent, the more coin days it builds.
When that Bitcoin finally moves, those accumulated coin days are “destroyed.” Hence the name.
How CDD Is Calculated
Coin Days Destroyed aggregates the destroyed coin days across all on-chain transactions in a given day.
The formula: CDD equals the sum of (Bitcoin spent multiplied by days since that Bitcoin last moved) for every transaction on a given day.
What makes CDD different from raw transaction volume is the weighting by age. A whale who bought 1,000 BTC last week and moves it today generates almost zero CDD. An early adopter who moves 10 BTC held since 2018 destroys thousands of coin days in a single transaction. CDD filters out noise and amplifies signal.
This age-weighting is what makes the metric valuable. It doesn’t ask how much Bitcoin moved. It asks: how long had that Bitcoin been sitting still?
Why Suppressed CDD Is Meaningful
When old coins don’t move
Extended periods of suppressed CDD tell a specific story: the holders with the lowest cost basis, who have survived multiple cycles, who have seen price crash 80%+ and recover, are not selling. They are waiting.
This cohort has the most to gain from patience. They bought at $3,000, $10,000, $20,000. Their cost basis is low enough that a drawdown to $65,000 is noise, not a crisis. When they don’t move, it signals conviction that current prices don’t reflect where they expect this to go.
Suppressed CDD through a bear market or correction is one of the more reliable signals that the cohort with the best historical track record remains unconvinced this is the end of the cycle.
When CDD spikes
A spike in CDD means old coins are moving. This matters for a few distinct reasons.
The most significant is long-term holder distribution. When experienced holders who have been sitting on positions for years decide the price is high enough to sell, CDD spikes. This is the pattern that historically precedes cycle tops: late 2017, November 2021. Coins dormant since the previous cycle began moving into the rally. Patient capital was exiting.
CDD can also spike due to miner operational activity, exchange wallet reorganizations, or one-off events like wallet recoveries. Context matters. A single-day spike is often noise. A sustained elevation above the 365-day moving average, occurring during price strength, is the signal worth monitoring.
CDD Through Bitcoin’s Historical Cycles
2017: The distribution pattern
As Bitcoin ran toward $20,000 in late 2017, CDD elevated consistently for weeks. Coins minted in 2013 and 2014 began moving. Early miners were distributing. The sustained CDD elevation was visible on-chain before the price peaked in December.
2021: Two peaks, two signals
Bitcoin’s 2021 cycle had two major peaks: roughly $64,000 in April and roughly $69,000 in November. In the weeks before both peaks, CDD elevated materially. The November top saw particularly notable readings as coins dormant since 2017 and 2019 began moving into the rally.
Crucially, those elevated readings resolved. After November 2021, as price crashed through 2022, CDD compressed. Long-term holders absorbed the drawdown without significant distribution. By the FTX collapse in November 2022, when BTC hit $16,000, CDD was historically low. Patient capital wasn’t capitulating. It was accumulating.
2024–2025: Modest elevation, not extreme
As Bitcoin broke through $60,000, $80,000, and eventually above $100,000 during the 2024–2025 run, CDD elevated modestly. Some long-term holders did take profits. But the elevation never reached the extremes of late 2017 or November 2021. Many cohorts that accumulated through 2020–2022 are still holding their positions.
How CDD Connects to Other Holder Metrics
CDD doesn’t work in isolation. It belongs to a family of metrics that examine Bitcoin holder behavior through the lens of time and cost basis.
SOPR (Spent Output Profit Ratio) measures whether coins are being moved at a profit or loss. When you break SOPR down by holder type, as covered in the aSOPR vs bSOPR breakdown, you get a cleaner read on whether it’s long-term conviction selling or short-term noise creating on-chain activity. CDD adds the age dimension: not just whether coins moved at a profit, but how long they had been sitting still.
HODL Waves take a complementary approach, mapping the age distribution of all unspent Bitcoin. When the 12-month-plus band expands, it confirms what low CDD suggests: old coins are aging further, not moving. The two metrics tell the same story from different angles.
For a full framework of weekly metrics worth tracking alongside CDD, the Bitcoin onchain dashboard covers the five-metric checklist that gives context to any individual signal.
CDD in April 2026: What the Data Shows
Bitcoin is trading near $78,000 as of late April 2026, recovering from the Q1 2026 correction that took price from the $108,000 all-time high down into the $65,000–$70,000 range.
Through that entire correction, CDD remained historically suppressed. Old coins did not move in significant quantities. The cohorts who accumulated during 2020, 2021, and 2022 did not capitulate. This behavioral pattern is consistent with prior cycle lows: through the 2018–19 bear market, through the March 2020 COVID crash, and through the 2022 drawdown, the holders with the lowest cost basis sat still while price fell.
Suppressed CDD through a correction doesn’t guarantee continuation. But it removes a key bearish signal from the picture. Distribution from experienced holders is not currently visible in the data.
What to Watch Going Forward
CDD is most useful as a warning system, not a trigger. Here is what to watch as this cycle develops.
The 365-day moving average. A sustained CDD elevation above the long-term average, maintained for two to four weeks, is the pattern that historically preceded cycle tops. A single-day spike is not this signal. Sustained elevation is.
CDD during price strength. Elevated CDD when BTC is making new all-time highs is different from elevated CDD during a correction. When old coins move into strength, that is distribution. When they move during a crash, it is often a forced event or an anomaly.
The $90K–$100K range. If Bitcoin reapproaches these levels, monitoring CDD will be particularly important. Some holders who bought in the $60,000–$80,000 range will take profits. The question is whether the oldest coins, those held since 2020 and before, begin moving in material quantities.
Right now, those coins are quiet. Coin Days Destroyed is low. The patient capital is still waiting.
Leave a Reply