Startale Group has selected Privacy Boost, developed by Sunnyside Labs, as the official privacy partner for the Startale app, marking what the company describes as the protocol’s first integration into a consumer-focused crypto platform. The deployment will take place directly on Soneium, the blockchain developed by Sony Block Solutions Labs, and is designed to bring native on-chain privacy and self-custody features to everyday users.
The announcement highlights Startale’s broader ambition to position its app as a gateway to the on-chain economy. The app supports asset management, payments, mini-apps, and ecosystem rewards, and the new privacy layer is intended to address one of the most persistent limitations of public blockchains: default transparency. In most blockchain environments, wallet balances, transaction amounts, and counterparties can be observed by anyone. Startale’s new integration aims to give users the ability to shield that information when needed, rather than forcing privacy to remain an advanced or inaccessible feature.
Privacy as an Optional but Native User Feature
According to the announcement, Privacy Boost uses a hybrid design that combines zero-knowledge proofs with trusted execution environments (TEE). This architecture is intended to support private transfers while maintaining performance suitable for consumer applications. The companies said proof generation can be completed in under 500 milliseconds, while throughput on Soneium exceeds 1,800 transactions per second. These figures matter because privacy tools have often been criticized for introducing latency, complexity, or limited scalability. Startale and Sunnyside are positioning this integration as an attempt to remove those barriers.
The system is also described as preserving user control while allowing for selective auditability, a feature that may be important in balancing privacy with compliance requirements. That approach reflects a growing trend in crypto infrastructure: offering privacy not as an all-or-nothing black box, but as a configurable layer that can coexist with regulatory expectations and operational oversight.
Sota Watanabe, CEO of Startale Group, said not every transaction needs to be private, but every user should have that option. His comment points to a practical framing of privacy in crypto. Rather than treating privacy as a niche use case, Startale appears to be embedding it as a standard feature that users can activate when their situation requires it.
Built Directly Into the Soneium Stack
Privacy Boost will deploy its full protocol stack on Soneium, including smart contracts and TEE infrastructure. That means the private transfer functionality is not limited to a single front-end experience, but is intended to become a native capability available to developers building on the network. For the broader Soneium ecosystem, this could make privacy-preserving transfers easier to integrate into applications without requiring teams to assemble custom privacy infrastructure from scratch.
Within the Startale app itself, the integration is expected to support several concrete functions. Users will be able to shield assets in private funds, make private transfers, and manage privacy-preserving payment flows. The announcement also notes that these payment flows are being designed with future crypto card usage in mind, suggesting that the companies are targeting real-world spending scenarios rather than limiting privacy to technical wallet operations.
This positioning is important because consumer adoption in crypto has long depended on making blockchain interactions feel less exposed and more intuitive. Everyday payments, app-based rewards, and mini-app interactions are all easier to imagine at scale when users are not required to reveal every transaction detail by default.
Focus on Consumer-Scale Use Cases
Taem Park, co-founder and CEO of Sunnyside Labs, said Startale is taking privacy in consumer crypto seriously across areas such as daily payments, card spending, and mini-apps. He described these as the exact use cases Privacy Boost was built for: high-performance privacy at consumer scale. That statement underscores the strategic direction of the partnership. This is not merely about adding privacy for power users or institutions; it is about integrating privacy into mainstream product flows where speed, usability, and scale matter most.
As Startale expands its app with new payment rails, mini-apps, and ecosystem features, the privacy layer is expected to expand alongside it. In practical terms, that means privacy could become embedded across a wider range of user interactions over time, rather than remaining confined to isolated transfer functions. If executed successfully, this could help make privacy an invisible but available part of the app experience—something users can turn on when necessary without leaving the broader ecosystem.
Why the Announcement Matters
The crypto industry has long struggled with a tension between transparency and usability. Public blockchains offer openness and verifiability, but that same transparency can be a drawback in consumer settings where users may not want all balances and payments to be publicly visible. Projects have attempted to solve this issue through different models, but many privacy systems have faced trade-offs in terms of speed, complexity, liquidity fragmentation, or regulatory concerns.
The Startale-Sunnyside partnership is notable because it attempts to combine privacy, performance, and consumer-facing product design in one stack. The claim of sub-500 millisecond proof generation and more than 1,800 TPS suggests the companies are aiming well beyond niche functionality. By integrating on Soneium and exposing privacy as a native capability, they are also making a statement about what next-generation blockchain applications may require if they want broader user adoption.
The release further notes that Startale Group recently completed a $63 million Series A round, including a $50 million investment from SBI Group, alongside earlier support from Sony. While the funding update is not the main focus of the privacy announcement, it provides additional context for the company’s expansion. It indicates that Startale is developing within a larger ecosystem push backed by established corporate and financial partners, especially around Soneium-related infrastructure and consumer applications.
For now, the key takeaway is that Startale is not treating privacy as a separate tool or optional extension bolted onto its platform. Instead, it is integrating privacy directly into the core app experience, with technical claims aimed at minimizing the usual trade-offs. If the rollout performs as described, it could serve as a case study for how blockchain apps may bring privacy to a wider user base without sacrificing speed or accessibility.