A handful of SDN-detailed pools nevertheless have an “operator” authorization. Of such, two belong to pretty aged, now-unused variations of Tornado Cash. The remaining swimming pools both have newer, immutable variations, or have been used so little that they had been very likely ignored throughout the Could 2020 closing update. https://kihinduma.com/understanding-tornado-cash-the-future-of-private-transactions-in-the-copyright-world/