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What Is a CoinJoin Mixer?
A CoinJoin mixer is a privacy service that merges your Bitcoin transaction with many other participants into a single combined multi-input, multi-output transaction. This removes any direct link between your deposit and your withdrawal.
Unlike a basic Bitcoin mixer, a CoinJoin mixer uses collaborative signatures where multiple users sign a joint transaction without revealing which output belongs to which participant. This structure defeats address-linking heuristics used by blockchain analytics companies.
Modern CoinJoin mixers use multi-pool liquidity, randomized batching, liquidity shuffling and output normalization to maximize entropy. These techniques weaken clustering, common-input ownership assumptions and other forensic tools.
When the mix is complete, your BTC emerges from a shared CoinJoin transaction where all outputs look identical. External observers cannot determine which output belongs to you, granting a strong anonymity set.