Is synonymous which has a Main subset from the Tornado Cash smart contracts: the Tornado Cash swimming pools. The overwhelming majority of such contracts are immutable. That's, they've no capability to be updated or removed by anyone. A whole listing of sanctioned, immutable Tornado Cash pools are available in Appendix https://biermannfamilyhistory.com/why-tornado-cash-is-the-go-to-privacy-protocol-for-copyright-users/