Ethereum Foundation Replaces Poseidon With SHA and BLAKE for L1
- Ethereum replaces Poseidon with SHA and BLAKE for future Layer 1 upgrades.
- Binary-field SNARK advances make traditional hash functions practical again.
- The roadmap targets leanVM in 2027 with wider deployments planned for 2028.
The Ethereum Foundation is changing its long-term cryptography strategy by replacing Poseidon with SHA and BLAKE for Layer 1 development. The shift follows major advances in zero-knowledge proof technology, which now make traditional hashing methods more practical for future network upgrades.
Ethereum Shifts Toward Established Hash Functions
Ethereum Foundation researcher Justin Drake, in an August 13 post on X, announced that the network would move away from Poseidon after years of research investment. The decision marks a significant shift in Ethereum’s post-quantum security roadmap and future cryptographic architecture.
Poseidon emerged in 2019 as a specialized hash function designed for zero-knowledge proof systems. It quickly became a popular choice across zk-rollups and zkVMs that secure billions in digital assets.
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