Privacy Pools (Buterin/Soleimani 2023) already showed you can have ZK privacy with selective disclosure of non-association with sanctioned addresses. Bringing it to L1 skips the L2 detour Aztec, Railgun, and zk.money were forced into post-Tornado. Shielded mempools also break MEV-Boost bundle visibility β€” meaningful chunk of validator revenue post-merge.

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