A handful of SDN-shown pools nonetheless have an “operator” authorization. Of these, two belong to incredibly old, now-unused versions of Tornado Cash. The remaining pools both have more recent, immutable versions, or have been utilized so small which they ended up most likely forgotten through the May 2020 ultimate update. https://fitnessfadcollection.com/2024/09/29/the-role-of-tornado-cash-in-protecting-blockchain-privacy/