UTXO Growth Rate
Estimated net change in the output set per day, from non-coinbase transactions and excluding detected OP_RETURN
Short ranges plot one point per block, about one every ten minutes. Longer ranges plot one point per day, computed from every block in that day. How it is computed depends on the chart: some average, some total the day up, some are a ratio of the day's sums, and each chart says which. Either way a brief spike inside a day is smoothed away.
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About this metric
Definition
Whether the set of spendable coins is growing or shrinking. Every transaction consumes existing outputs and creates new ones, and the running total of unspent ones is the UTXO set. Positive means more were created than consumed, and negative means the reverse, which is consistent with wallets consolidating small coins without establishing that any of them did.
How it is measured
Outputs created, minus the ones that can never be spent, minus inputs consumed. OP_RETURN outputs are provably unspendable and never enter the set, so they do not count as growth. The coinbase transaction is absent from these counts, so its own outputs are missing and this runs about three per block short of a node's own figure. Net, not cumulative, which is why it goes negative and why a log axis cannot plot every point. The set matters because every node holds it in memory to validate, making it a running cost to the whole network.
Measured from my own Bitcoin node. Methodology