StarkWare, a blockchain infrastructure company focused on zero-knowledge (ZK) technology, has unveiled STARK Two (S-two), a next-generation, mobile-optimized ZK prover that enables users to generate cryptographic proofs directly on their devices.

Those devices include smartphones and laptops, and web browsers can also be used, without any need to rely on centralized servers or cloud infrastructure.

The StarkWare team said that benchmark tests had shown that S-two was up to 39 times faster than previous products, such as Succinct’s SP1, and 28 times faster than Risc Zero’s R0VM for certain workloads.

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“S-two outperforms every other prover on the market — across a wide range of real-world use cases,” the team said. “Whether you’re working on Bitcoin, Ethereum, AI, zkML, or in need of recursive proofs — S-two delivers faster performance.”

The release comes over a year after StarkWare announced it was building S-two at ETH Denver, noting that the code would be open-sourced under the Apache 2.0 license.