Bitcoin Liveliness

Liveliness was introduced by Tamás Blummer in December 2018: cumulative coin days destroyed ÷ cumulative coin days created. The denominator is every coin-day the network has ever accrued; the numerator, the portion destroyed by spending. Bounded between 0 and 1: if no coin ever moved it would approach 0; if all coins churned constantly, 1. It compresses HODLing behavior into a single curve.

As a cumulative ratio, the absolute level says little — read the slope. Rising: coin days are being destroyed faster than created, old supply is spending, long-term holders are net distributing. Falling or flat: fresh accrual outpaces destruction, supply is settling, holders are net accumulating. Blummer's original observation: Liveliness climbs during price advances (distribution) and declines during range-bound periods (accumulation) — consistent with top-of-cycle distribution and bear-market hoarding.

Lost coins accrue coin-days into the denominator forever but never spend into the numerator, structurally depressing the reading and imparting a long downward drift. Like every CDD-family metric, exchange cold-wallet consolidations and custody migrations produce destruction spikes unrelated to sentiment. And the cumulative construction makes it extremely smooth — useful for quarter-to-year trend inflections, meaningless for short-term trading.

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