Startale, a Web3 joint venture backed by Japan's SBI Holdings, Sony, and the Astar Network Foundation, has launched a groundbreaking private transfer feature for its app on Soneium, Sony's Ethereum Layer 2 network. The new capabilities include private transaction balances, peer-to-peer private transfers, and privacy payment functions, enabling users to execute transactions without revealing sensitive financial details to the public ledger.
The implementation uses zero-knowledge proofs and trusted execution environments to shield transaction data. According to the announcement, the system can generate proofs in under 500 milliseconds and process more than 1,800 transactions per second. It preserves self-custody while allowing selective auditability, balancing privacy with regulatory considerations.
This integration represents Privacy Boost's first implementation within a consumer-facing application, deployed directly on Soneium. Posititioned as a gateway to the on-chain economy, the Startale App supports asset management, payments, Mini Apps, and ecosystem rewards. The partnership with Sunnyside Labs brings a hybrid privacy architecture combining zero-knowledge proofs with trusted execution environments, enabling private transactions while maintaining performance and compliance flexibility.
"Not every transaction needs to be private, but every user should have the choice," said Sota Watanabe, CEO of Startale Group. "With Privacy Boost integrated into the Startale App, privacy becomes something users can enable when it matters."
The deployment also includes the full Privacy Boost protocol stack on Soneium, allowing developers to integrate privacy features directly into applications built on the network. Startale plans to expand its privacy features to include confidential smart contract interactions and decentralized identity management, with future applications including crypto-linked card payments and Mini App ecosystems.
