StarkWare Launches Stark Two: A Client-Side ZK-Prover for Everyday Devices

The StarkWare team, the developers of the Ethereum layer two solution StarkNet, has introduced Stark Two (S-two)—a tool for verifying Zero-Knowledge (ZK) proofs on everyday devices like phones, laptops, and more.

Currently available in a public alpha version, S-two is set to be deployed on the StarkNet mainnet later this year. It operates on both CPU and GPU, with browser compatibility expected soon.

This latest iteration of StarkWare’s ZK prover enables the generation of cryptographic proofs on the client side, eliminating the reliance on server or cloud infrastructure. This enhancement paves the way for faster and more private applications online.

«S-two will unlock new practical use cases for ZK,» explained Eli Ben-Sasson, co-founder and CEO of StarkWare.

According to the developers, S-two is 39 times faster than previous versions, significantly improving the performance of privacy-enhancing applications—ranging from private transactions and ZK-based identification to verifiable AI.

StarkWare representatives noted that developers can experiment with S-two, as the alpha version supports hardware targets. Development teams such as Kakarot, Nexus, ZAN, and AntChain OpenLabs have begun testing it.

In an interview with Cointelegraph, the company’s COO, Oren Katz, stated that S-two will enable privacy features in messaging, payments, and digital identity.

«You’ll be able to prove a transaction was valid without revealing your balance, or verify your identity without disclosing personal information,» the executive clarified.

Katz added that even salary payments could be made «on-chain» with complete transparency while keeping sensitive information confidential.

It’s worth mentioning that Ethereum co-founder Vitalik Buterin has referred to privacy as the foundation of freedom.

Previously, the cryptographer highlighted the advancements toward fully autonomous ZK-protected private transfers in practice.