The Critical Role of Relayers
A relayer is a service that significantly boosts privacy during a Tornado Cash withdrawal. Instead of submitting the withdrawal transaction yourself, a relayer does it for you, paying the Ethereum gas fee with its own funds. This prevents your withdrawal address from being linked to the transaction on the blockchain. The relayer receives a small fee for this service from your withdrawn amount. The Tornado Cash site lists available relayers and explains how to integrate their service for maximum operational security.