Startale Group has selected Sunnyside Labs’ Privacy Boost as the privacy solution for its Startale App, which operates on Soneium, a blockchain network linked to Sony. The integration will add self-custodial private transfers to the app, introducing shielded balances, private peer-to-peer transfers and privacy-enabled payment flows for users on Soneium.
The update gives Startale a consumer-facing privacy layer inside its Sony-linked ecosystem, aiming to let users hide transaction details from the public chain while still allowing operators to meet compliance obligations. Sunnyside Labs’ approach combines on-chain cryptography with an access mechanism called Audit View that lets authorized service operators inspect otherwise concealed transaction data.
Sunnyside’s founders describe Audit View as a way to mirror traditional finance’s compliance model: transaction details remain private to the public, but regulated service providers can access records when required for anti-money laundering (AML) checks or other regulatory duties. That differs from privacy tools that make transactions opaque to everyone, including network operators.
However, that architecture also raises governance questions about who controls access to private records. Privacy Boost hides transaction information from general viewers, but Audit View preserves operator-level visibility for compliance. That means users’ privacy depends not only on the cryptographic design but also on Sunnyside’s policies and the procedures operators use to authorize reviews of shielded data.
Selective disclosure and the privacy–compliance trade-off
Audit View places Startale’s implementation alongside other privacy systems that balance concealment with limited disclosure. Networks like Zcash use zero-knowledge proofs and offer selective disclosure through viewing keys; Secret Network uses viewing keys as encrypted access tied to specific contracts. A Feb. 19 report from blockchain analytics firm TRM Labs argued that view keys provide strong privacy but limited compliance utility, especially for high-value or fast-moving transfers and system-wide monitoring.
Privacy Boost opts for a different compromise by giving authorized operators the ability to view private transactions for compliance purposes. That design can make private transfers more practical for regulated consumer use cases, but it also means disclosure controls are not governed solely by the end user.
TRM Labs concluded that no single privacy regime satisfies all stakeholder needs and suggested hybrid approaches—combining selective visibility, robust access controls and limits on private-asset conversions—may be the most workable path forward for balancing user privacy with regulatory requirements.
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