Ethereum's layer-one roadmap is moving away from the SNARK-friendly Poseidon hash and toward standard SHA and BLAKE-family hashes after Ethereum Foundation researcher Justin Drake said on Aug. 13 that advances in binary-field proving systems had reversed the old tradeoff that favored custom zero-knowledge cryptography. Drake said there was no break in Poseidon and no migration order for existing rollups or zkVMs, but newer work including the July 29 Flock paper showed conventional hashes can now be proved far more efficiently, with reported throughput of about 42,000 SHA-256 compressions and 30,000 Keccak permutations per second on one M4 Max core and more than 660,000 BLAKE3 compressions across 10 cores. The shift feeds into Ethereum's post-quantum architecture, which calls for leanXMSS signatures and leanVM proofs to compress much larger hash-based data more cheaply while the protocol is simplified to reduce attack surface. Drake's strawmap still points to production-grade leanVM in 2027 and wider consensus, data and execution-layer deployments in 2028, while Ethereum's official roadmap gives a nonbinding target of about 2029 for core infrastructure and tells users to leave wallets unchanged for now.