Blockchain company StarkWare has unveiled zero-knowledge (ZK) prover STARK Two (S-two)

output:input: Blockchain company StarkWare has unveiled zero-knowledge (ZK) prover STARK Two (S-two), enabling enhanced privacy and verification on everyday devices like phones, laptops and browsers.

StarkWare, the blockchain company behind StarkNet, has unveiled a new generation of zero-knowledge (ZK) prover named STARK Two (S-two). The company said the ZK prover is 39 times faster than old solutions and allows users to generate complex cryptographic proofs from the client side.

This means users can generate ZK-proofs directly on their devices—like phones, laptops and browsers—instead of relying on a server or cloud infrastructure.

The company said the ZK prover is now available in public alpha and set to roll out on Starknet later this year.

S-two will bring STARK proving to everyday devices, and open the door for new real-world proving use cases,” said Eli Ben-Sasson, StarkWare co-founder and CEO.

According to StarkWare, developers can build with S-two, adding that its alpha release supports hardware targets.

Ben-Sasson said: “For years we’ve called the prover our magic wand, a tool that transforms complex computation into a simple proof. Now, the wand has become a lightsaber in your pocket, something anyone can wield, instantly, from your own device.”

The company said ZK ecosystem participants like Kakarot, Nexus, ZAN and AntChain OpenLabs have already adopted the technology.

Kakarot uses S-two inside ETHProofs to generate Ethereum block proofs more efficiently, while Nexus is standardizing RISC-V traces to align with S-two’s architecture. Meanwhile, ZAN and AntChain OpenLabs are adding GPU acceleration to push the prover’s performance even further.

Its use cases include private transactions, ZK-based identity and verifiable artificial intelligence. S-two runs on CPUs, GPUs and will soon be on browsers.

StarkWare says the upgrade also allows use cases in other industries. For instance, it can enable gamers to play offline and later generate cryptographic proof of their achievements.

An operator, instead of running all logic onchain to prove integrity, can run it on their own servers and simply generate a proof that it was executed correctly,” added Ben-Sasson.

The launch of StarWare’s upgraded ZK prover follows Ethereum’s push for better privacy. On April 11, Ethereum co-founder Vitalik Buterin published a roadmap that addressed privacy enhancements for wallets, decentralized finance (DeFi) applications and infrastructure.

Buterin advocated implementing privacy-enhancing norms and features across the Ethereum ecosystem, including adding privacy tools in ETH wallets.