Poseidon is open for business. Get smashing! HashSma.sh This is the variant of Poseidon used in Zcash, so we really want to see exactly how much of it can be collided! (Zcash users will be safe, regardless, btw.)

Why will Zcash users still be safe? Because the Zcash cryptographers very carefully designed the Zcash protocol so that the only property that it needs from Poseidon is weak PRF, to protect Zcash users even if Poseidon turned out to be vulnerable to collisions.

Thanks to @annkkitaaa for contributing a Poseidon PR to HashSmash!