Startale Group has announced that it has selected Privacy Boost, a privacy protocol developed by Sunnyside Labs, as the official privacy partner for the Startale App. The move marks the first time the protocol has been integrated into a consumer-facing crypto platform. According to the announcement, Privacy Boost will be deployed directly on Soneium, the blockchain developed by Sony Block Solutions Labs, and embedded into the Startale App to provide onchain privacy and self-custodial functionality.
A privacy layer for mainstream onchain use
The Startale App is positioned as a gateway to the onchain economy, offering asset management, payments, mini-apps, and ecosystem rewards in a single consumer product. By adding Privacy Boost, Startale is attempting to address one of the most persistent issues in public blockchain systems: default transparency. In most blockchain environments, wallet balances, transaction amounts, and counterparties can be viewed publicly by design. Startale’s integration is aimed at giving users an optional privacy layer without removing control over their assets.
Startale Group CEO Sota Watanabe said that not every transaction needs to be private, but every user should have the ability to turn privacy on when necessary. That framing suggests the company is not trying to replace transparent blockchain transactions entirely, but rather to make privacy a configurable feature inside a consumer application.
This distinction matters for adoption. For many users, especially those entering crypto through payments and app-based experiences, fully public transaction activity can create friction. Everyday spending, asset transfers, and app interactions often require a more nuanced balance between openness and confidentiality. Startale’s decision to integrate a privacy protocol at the application level appears designed to make that balance easier to manage.
Sub-500 millisecond proof generation and over 1,800 TPS
According to the press release, Privacy Boost uses a hybrid architecture that combines zero-knowledge proofs with trusted execution environments (TEEs). The system is designed to enable private transfers with proof generation in less than 500 milliseconds and throughput of more than 1,800 transactions per second on Soneium.
Those performance metrics are central to the product’s pitch. Privacy systems have often faced a trade-off between strong confidentiality guarantees and usability, particularly in consumer applications where users expect transaction flows to feel instant. By targeting sub-second proof generation and relatively high throughput, Privacy Boost is being positioned not as an experimental privacy tool, but as infrastructure intended for mainstream-scale use.
The company also said the system preserves user control while enabling selective auditability for compliance purposes. That point is especially significant in the current market environment, where privacy-enhancing technology is often evaluated not only for its technical merits but also for how it can coexist with regulatory expectations. Selective auditability suggests Startale and Sunnyside Labs are trying to support privacy without fully removing the possibility of oversight when needed.
Native private transfers inside the Startale App
Privacy Boost will deploy its full protocol stack on Soneium, including smart contracts and TEE infrastructure. As a result, private transfers are expected to become a native capability available to developers building on the network. For the Startale App itself, the integration will support asset shielding in private funds, private transfers between users, and privacy-preserving payment flows designed with future crypto card use cases in mind.
This expands the scope of the partnership beyond a simple wallet feature. Startale is building an application layer intended to support multiple types of consumer activity, from payments to mini-app interactions. Embedding privacy directly into those flows could allow users to engage with onchain services without exposing every balance movement or transaction detail by default.
Taem Park, co-founder and CEO of Sunnyside Labs, said Startale is taking consumer crypto privacy seriously across areas such as everyday payments, card spending, and mini-apps. He described those as the exact use cases Privacy Boost was built for, emphasizing high-performance privacy at consumer scale. His comments underscore the broader thesis behind the integration: privacy is being treated not as a niche feature for advanced users, but as an infrastructure component for ordinary digital finance experiences.
Expansion tied to the growth of the Startale ecosystem
The announcement indicates that the integration is expected to expand alongside the Startale App as new payment flows, mini-apps, and ecosystem functions are added. In practical terms, that means privacy could become embedded across a wider range of user interactions over time, rather than being limited to one isolated transaction type.
That roadmap is relevant for Soneium as well. If private transfers and privacy-preserving payment logic become available as native building blocks on the network, developers may be able to create a broader class of consumer applications that do not rely entirely on public-by-default transactional behavior. For a blockchain ecosystem seeking wider user adoption, that could represent a meaningful shift in product design.
The Startale partnership also comes amid broader momentum for the company. The source material notes that Startale Group has closed a $63 million Series A round, including a $50 million investment from SBI Group, with prior support from Sony. While the funding announcement is separate from the privacy integration itself, it provides additional context for the scale of Startale’s ambitions and its strategic positioning within the Soneium ecosystem.
Taken together, the new integration points to a clear direction: Startale wants to build a consumer-facing onchain platform where privacy is available by choice, performance is sufficient for everyday use, and payments can evolve beyond the limitations of fully transparent blockchain activity. Whether that model gains traction will depend on execution, developer adoption, and user demand, but the company is signaling that privacy should be treated as a standard feature of next-generation crypto apps rather than an afterthought.