Ethereum Foundation Abandons Poseidon Hash Algorithm in Favor of SHA2 or BLAKE2

The Ethereum Foundation has decided to abandon the SNARK-friendly hash algorithm Poseidon at the L1 layer, opting instead for traditional hash functions like SHA2 or BLAKE2. Ethereum researcher Justin Drake stated that this shift is due to breakthrough advancements in SNARK design, where the performance of traditional hash functions in SNARK circuits can rival that of Poseidon, with a single laptop capable of completing approximately 1 million traditional hash calls per second. Since its introduction in 2019, Poseidon has been the mainstream SNARK-friendly hash solution, providing security for applications such as zkRollup and zkVM. Justin Drake revealed that a production-grade leanVM is expected to be launched in 2027, with related deployments for the consensus layer, data layer, and execution layer anticipated to be completed by 2028. The Ethereum Foundation's post-quantum team is also accelerating research related to binary fields.

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