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Ethereum Foundation to drop Poseidon hash in base-layer plans, targets leanVM for 2027

AI Market Summary
The Ethereum Foundation's decision to drop the Poseidon hash in favor of a simpler, quantum-resistant base-layer design reflects a meaningful shift in Ethereum's long-term cryptography roadmap. Advances in binary-field proof systems reduce the relative advantage of SNARK-optimized hashes, potentially simplifying future protocol and proving-stack choices. Timelines pointing to leanVM in 2027 and rollouts in 2028 frame the change as strategic rather than immediate.
Impact level
● Medium
Affected assets
ETH/USDT+0.10%
AI Insight · ETH/USDTAI Insight
● Neutral
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Ethereum Foundation core researcher Justin Drake said on Aug. 13, 2026, that the foundation will move away from the Poseidon hash function in its planned future Ethereum base-layer design. He said advances in proof systems operating over binary fields have shifted the tradeoff, allowing standard hash functions to match Poseidon’s SNARK performance. The foundation is targeting a production-grade leanVM for 2027, with layer rollouts penciled in for 2028.
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