CoinJoin-shaped share of block weight
transactions with the fingerprint of a privacy join
How much of the block's capacity was taken up by transactions that look like a CoinJoin, where several people combine one transaction to break the link between their coins.
DefinitionShape heuristic: whole-transaction weight of transactions with at least 3 outputs of exactly equal value, over total block weight. Catches the Wasabi and Whirlpool shapes.
LimitProvisional, and it misses PayJoin entirely, which is deliberately shaped to look like an ordinary payment. This is a shape heuristic over the transaction graph, not a label: it counts transactions that LOOK like this, and cannot tell you who made them or why.