Tornado Cash operates over the Ethereum community which is secured by zero-knowledge proofs. The Tornado Cash protocol and the anonymity mining protocol continues to be audited by a number of Qualified audit corporations such as Zeropool. To recall an earlier stage, Ethereum is clear: anybody can view the transaction record https://litefrance.info/understanding-tornado-cash-the-future-of-private-transactions-in-the-copyright-world/