Mixers and Tumblers
Web3 / privacy technology
Mixers and tumblers are services that enhance cryptocurrency privacy by combining funds from multiple users into a common pool and then redistributing them to new addresses in a way that breaks the on-chain link between original senders and receivers. Users deposit cryptocurrency into the mixer, and after a waiting period or when sufficient funds accumulate, the service sends different amounts to new addresses the user controls. This process obscures the transaction history and makes it difficult for blockchain analysts to trace the flow of funds from sender to recipient through standard chain analysis. Example: Tornado Cash was a prominent Ethereum-based mixer that allowed users to deposit ETH or ERC-20 tokens and later withdraw them to fresh addresses, breaking the transaction trail. The service used smart contracts to pool deposits and distribute withdrawals in a way that severed the on-chain connection between input and output addresses. Why it matters for privacy technology: Mixers serve as a critical privacy tool for users seeking financial confidentiality from public blockchain surveillance. They enable participants to reclaim privacy on transparent blockchains, though regulators increasingly scrutinize these services for potential misuse in money laundering.
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