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Poseidon held a performance advantage inside the Ethereum Foundation's post-quantum design. Researcher Justin Drake said that advantage is now gone.
Advances in compact proofs erased it, and the Foundation is pivoting away from Poseidon in its post-quantum plan as a result.
The compact proof advance that changed the calculus Drake attributed the shift directly to progress in compact proofs. Poseidon's prior edge over other options had made it a logical fit for the post-quantum roadmap.
That edge closed as compact proof technology caught up. The performance argument for Poseidon no longer holds.
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