A Few SDN-shown swimming pools nonetheless have an “operator” authorization. Of these, two belong to very old, now-unused versions of Tornado Cash. The remaining swimming pools either have more recent, immutable variations, or have been used so minor which they have been likely neglected throughout the May 2020 last update. https://boundaryroadstudios.com/why-tornado-cash-is-the-go-to-privacy-protocol-for-copyright-users/