Ethereum Foundation abandons Poseidon hash function for SHA-2 and BLAKE2s

The Ethereum Foundation has announced that its layer 1 network will no longer utilize the Poseidon hash function. This decision comes after eight years of extensive research and development dedicated to Poseidon. Justin Drake, a researcher at the Ethereum Foundation, confirmed the pivot during a public announcement on August 13, 2026.

The shift to more established cryptographic algorithms like SHA-2 and BLAKE2s is driven by advancements in compact proofs that have diminished Poseidon's performance advantage. This change is part of a broader trend in the cryptocurrency space towards adopting proven cryptographic standards.

The decision to abandon Poseidon is significant in the context of evolving cryptographic security, particularly as the industry prepares for potential quantum computing threats. The Ethereum Foundation's research effort on Poseidon involved substantial financial investment and commitment over the past eight years.

As the landscape of cryptographic standards continues to evolve, the importance of compatibility and security becomes paramount. This pivot reflects a proactive approach by the Ethereum Foundation to ensure its network remains resilient and secure in a post-quantum world.

As Ethereum transitions to SHA-2 and BLAKE2s, it is likely to enhance its security posture and maintain competitiveness in the rapidly evolving cryptocurrency landscape. Stakeholders should monitor developments in Ethereum's implementation of these algorithms, as they may have significant impacts on security and performance metrics.

The decision to adopt established cryptographic functions indicates a commitment to adapting to the changing technological environment, which could influence other projects in the cryptocurrency space.