CoinJoin deliberately breaks the co-spend heuristic, so analytics must recognize CoinJoin transactions rather than cluster their participants together. Exposure to CoinJoin is a privacy signal, not proof of illicit activity; analysts weigh the wallet, amounts, timing, and what happened to the funds afterward.
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Glossary term
What is CoinJoin?
CoinJoin is a privacy technique for Bitcoin-style blockchains in which several users combine their inputs into one transaction and receive equal-sized outputs, so observers cannot easily tell which output belongs to which input. It is used by privacy-focused wallets and sometimes to launder proceeds, so compliance teams evaluate it in context.