After many requests, Poseidon hash has been selected as the next native cryptography feature for Sui mainnet. Poseidon is ideal for fast circuits inside Zero Knowledge Proof systems, where traditional hashes like SHA256 are too heavy. Poseidon works directly over prime fields, making ZK proofs cheaper, smaller, and faster. ⸻ 2/ Why does this matter? When verifying a Groth16 proof, developers normally expose many public inputs, increasing proof size, cost, and potentially data leakage. With Poseidon on Sui, you can hash all those inputs inside the circuit and expose just one value on-chain or hash values off ZK and then just provide the hash output as ZK public input. 👉 The result: shorter proofs (always constant size), lower and constant gas independently on your inputs size, and cleaner privacy guarantees. ⸻ 3/ This integration means Sui developers will be able to bridge off-chain computation and on-chain verification natively without sacrificing performance or elegance. We also allow up to 16 elements and if you need more, you just create a Poseidon Merkle tree over all of your inputs. It’s cryptography that feels seamless, composable, and programmable through Sui Move. I can’t wait for this GitHub PR to be merged and start playing with cool ZK, zeeCat, zkLogin as account abstraction and zkTunnels.