Tokyo, Japan, April 28th, 2026, Chainwire
Startale Group today announced a partnership with Sunnyside Labs, selecting Privacy Boost as the official privacy partner for the Startale App. Privacy Boost will deploy natively on Soneium and integrate directly into the Startale App, introducing self-custodial, onchain privacy capabilities within a consumer crypto platform.
The integration marks a milestone in Startale App’s development as a core consumer entry point to Soneium, the blockchain developed by Sony Block Solutions Labs. It also represents Privacy Boost’s first integration into a consumer-facing application.
The Startale App is designed to make the onchain economy accessible to mainstream users, supporting functions such as asset management, payments, Mini Apps, and ecosystem rewards. As adoption grows, the partnership aims to address the visibility of onchain transactions, where balances, transfer amounts, and counterparties are publicly accessible by default.
Privacy Boost introduces a hybrid architecture combining zero-knowledge proofs and trusted execution environments, enabling private transactions with sub-500 millisecond proof generation and throughput exceeding 1,800 transactions per second. The system maintains user self-custody while supporting selective auditability for compliance requirements.
“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. It puts control in their hands to decide when and how they protect their onchain activity. That is what a true SuperApp should deliver.”
As part of the partnership, Privacy Boost will deploy its full protocol stack on Soneium, including smart contracts and TEE infrastructure, making private transfers available as a native capability for developers building on the network.
Within the Startale App, Privacy Boost will be integrated via SDK to enable features such as shielding assets into private pools, private transfers that conceal balances and counterparties, and privacy-preserving payment flows designed for future crypto card functionality.
“Startale is serious about bringing privacy to consumer crypto, from everyday payments and card spending to mini apps,” said Taem Park, Co-Founder and CEO of Sunnyside Labs. “These are exactly the use cases Privacy Boost was built for, high-performance privacy at consumer scale, with an SDK designed for native application and mini app integration alike.”
The integration is designed to scale alongside the Startale App as it expands into additional payment flows, Mini Apps, and ecosystem integrations, reinforcing a broader approach to embedding privacy across all user interactions.
About Startale Group
Startale Group is a global crypto infrastructure company on a mission to build the next civilization by bringing the world on-chain. The company operates Astar Network, Japan's largest public blockchain, and co-develops Soneium through Sony Block Solutions Labs, a joint venture with Sony Group Corporation. Startale also builds consumer and developer products, including the Startale App, which serves as an all-in-one gateway to the Soneium ecosystem.
About Sunnyside Labs
Sunnyside Labs is a core contributor to the OP Stack and Ethereum, building privacy-first infrastructure for public blockchains. Privacy Boost is their flagship product — enterprise-grade, self-custodial onchain privacy combining ZK proofs and TEEs for high-performance, compliant private transactions. privacyboost.io
ContactStartale
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