[Ethereum Foundation Abandons Poseidon Hash, Switches to SHA or BLAKE] Ethereum Foundation researcher Justin Drake tweeted that the Ethereum Foundation has decided to abandon Poseidon hash on L1 and switch to using traditional hash functions SHA or BLAKE. Since 2018, the Ethereum Foundation has been investing in 'SNARK-friendly hashes.' Poseidon was introduced in 2019 and became mainstream, widely used by many zkRollups and zkVMs.