How bitcoin mixers work, step by step
MixerRank Research · Published · Updated · 7 min read
Coordinators, blinded signatures and equal-value outputs — the actual mechanics behind a mixing round, explained without hand-waving.
Registration and blinded signatures
Participants register inputs with a coordinator, then register their output addresses through a blinded signature scheme. The coordinator can verify that an output belongs to a paying participant without ever learning which input it belongs to — that is the cryptographic core of a trustless CoinJoin.
Equal-value outputs and remixing
The round produces outputs of identical size, so they are interchangeable. Wasabi's WabiSabi protocol relaxes this with credential-based amounts, while Whirlpool uses strict fixed pools. Both rely on remixing: each additional round multiplies the anonymity set of a coin, which is why free remixes matter more than the headline fee.
Delays, batching and payout splitting
Custodial tumblers add a second layer: configurable delays of hours to days and payouts split across several addresses. This defeats timing correlation and amount correlation, the two cheapest heuristics an analytics firm can run against your withdrawal.