Technical and economic challenges in implementing encrypted mempool solutions—including cryptographic constraints, key management complexity, and liability issues—may delay or complicate deployment on Ethereum

"They say no known cryptographic construction currently satisfies the entire set at Ethereum's scale. If a key is withheld or fails to arrive on schedule, LUCID's initial draft leaves the protocol-level penalty for a failed multi-key reveal with the transaction sender rather than automatically transferring it to the third-party key provider."