Empty Blocks by Pool
Coinbase-only blocks in the range, grouped by the pool that mined them
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
Which pools mined the coinbase-only blocks. Almost all of them are unattributed, because pool identification reads patterns in the coinbase that did not exist in 2009 and 2010, which is when nearly every empty block was mined. So the Unknown bar is a statement about the early chain rather than about anonymity today.
How it is measured
Blocks with a transaction count of one, grouped by the miner string ingestion matched, with unmatched blocks under Unknown. Aggregated in SQL over the height range rather than from the loaded rows, so it answers for the whole window at any resolution.
Measured from my own Bitcoin node. Methodology