Cumulative Supply Days is the running total of supply-days the network could have accumulated through time, given the supply that existed on each day. It is the stock of potential coin-age, not a read on whether coins were active or dormant.
A rising series means the network continues adding possible accumulated age as supply exists and new issuance begins contributing coin-days. It is most useful with Coin Days Destroyed and Liveliness, where the question is destroyed age relative to the age base available to destroy.
The main limitation is monotonic structure. On its own, this series does not forecast price or identify turning points, because it rises almost continuously. Its value is foundational: it provides the denominator that lets age-destruction metrics become interpretable.
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