On June 9, 2025, StarkWare and Sui simultaneously shipped privacy tooling designed to satisfy regulators, marking a sector-wide pivot toward a “compliance-first” model for on-chain confidentiality.
🔑 Key Takeaways
- Starknet launched STRK20, a zero-knowledge (ZK) privacy framework dedicated to ERC-20 tokens.
- Sui activated confidential transfers in public beta, masking transaction amounts.
- Both solutions integrate viewing keys enabling disclosure upon legally binding requests.
- Regulatory pressure is rising: $12.5M in USDC frozen at Zama, plus a Zcash vulnerability patched in early June.
- SUI is stabilizing around $0.75, with buyers defending a key support zone.
STRK20: ZK Privacy Built Into ERC-20 Tokens
Starknet officially launched STRK20, a zero-knowledge-based privacy framework for ERC-20 tokens. According to the technical documentation, any ERC-20 asset deployed on Starknet can now operate with hidden balances and private transfers, without developers having to build a dedicated privacy layer. The framework supports transfers, swaps, lending, staking and payments within a unified system.
Eli Ben-Sasson, co-founder and CEO of StarkWare, detailed the philosophy. He explained that STRK20 operates under a risk-based model: privacy is conditional, not absolute. Screening is applied when assets enter the shielded pool, and disclosure becomes possible through viewing keys when a legally binding request is issued.
“The framework provides the infrastructure enabling disclosure without itself determining legal compliance. Privacy is conditional, not absolute.”
Eli Ben-Sasson, Co-founder & CEO, StarkWare
Damian Chen, VP of Development at the Starknet Foundation, summarized the ambition as “practical privacy in the truest sense of the term.” He contrasted STRK20 with traditional mixers: a mixer routes assets to a separate destination to break the on-chain trail, while STRK20 embeds protection directly into the asset. Privacy becomes a default operating mode, not an extra step.
A Multi-Tier Disclosure Mechanism
Viewing keys allow selective disclosure of wallet activity. This data is accessible only in response to legally binding requests; all other transactional information remains hidden from the public. The framework has also undergone formal verification of the STRK20 privacy pool, strengthening the security guarantees of its cryptographic circuits.
Sui Bets on Hidden Amounts
Alongside Starknet, Sui activated confidential transfers in public beta. The technical approach differs: Sui hides transaction amounts rather than full transaction flows, while still allowing authorized parties (auditors, regulators) to access the data for compliance purposes.
Both protocols nonetheless share the same mental architecture: integrating privacy as a native property rather than an optional, bolted-on layer.
| Feature | Starknet STRK20 | Sui Confidential Transfers |
|---|---|---|
| Core technology | Zero-knowledge proofs | Amount-level encryption |
| Scope | ERC-20 tokens on Starknet | Native transfers on Sui |
| Hidden element | Full balances and transfers | Amounts only |
| Disclosure mechanism | Viewing keys on legal request | Authorized audit access |
| Status as of June 9, 2025 | Official launch | Public beta |
| Covered use cases | Transfers, swaps, lending, staking, payments | Payments and transfers |
Shieldnet: Privacy Becomes a Brand
Starknet has consolidated all its privacy tools under the Shieldnet brand. This banner encompasses the network’s native protection features, including shielded balances and confidential transfers. The published roadmap tracks recent milestones: STRK20 in March, the Shinobi upgrade in April, and strkBTC in May, extending privacy to wrapped Bitcoin on Starknet.
The strategy explicitly targets the institutionalization of on-chain privacy. Nightfall, a privacy solution aimed at institutions, has been deployed on Starknet. The framework also underwent formal verification of the STRK20 pool, a mathematical auditing standard still rare in the crypto industry and particularly demanding for complex cryptographic circuits.
A Tightening Regulatory Backdrop
These launches come amid escalating pressure on privacy-focused projects. Zama, a specialist in homomorphic encryption, announced on June 2 that it was accelerating its compliance roadmap. That decision followed a court-ordered freeze of approximately $12.5 million in USDC held in its confidential USDC wrapper, an amount later released after the underlying legal request was resolved. Zama highlighted its disclosure mechanisms and its coordination with regulators.
The sector was also shaken by a vulnerability in Zcash. Developers disclosed a bug raising concerns about undetected creation of counterfeit tokens. The flaw was patched via an emergency upgrade in early June. No confirmed exploitation was established, but the nature of shielded pools makes exhaustive reconstruction of historical activity difficult after such disclosures.
“While a mixer routes assets to a separate destination to break the transaction trail, STRK20 embeds protection directly into the asset itself.”
Damian Chen, VP Development, Starknet Foundation
Markets: SUI Consolidates Near $0.75
On the price side, the SUI token showed early signs of stabilization after several months of selling pressure. At the time of the announcement, SUI was trading around $0.75, with buyer behavior suggesting active defense of an important technical support zone. Despite trading well below its prior highs, trading activity indicated entry into a consolidation phase that could evolve into a broader rebound.
| Indicator | Value as of June 9, 2025 |
|---|---|
| SUI price | ≈ $0.75 |
| Short-term trend | Stabilizing |
| Market phase | Post-correction consolidation |
| Technical setup | Buyers defending key support |
Conclusion: Privacy Enters the Compliance Era
The coordinated launches of STRK20 and Sui’s confidential transfers reflect a paradigm shift: privacy is no longer sold as crypto-libertarian absolutism, but as a native feature compatible with legal obligations. This “viewing key + entry screening” model seeks the equilibrium point between transaction secrecy and traceability upon state request.
For pure-privacy projects (Zama, Zcash), the challenge now is to reassure regulators without diluting their core value proposition. For general-purpose networks like Starknet and Sui, privacy becomes an institutional adoption argument, particularly for real-world assets (RWA) and payments use cases. The coming quarters will reveal whether the on-chain compliance market truly takes shape.
Sources
- Cointelegraph — Privacy Push Accelerates as StarkWare and Sui Launch Compliance-Ready Confidential Transfers
- CoinMarketCap Academy — Starknet launches STRK20 ZK privacy layer
- Ground News — StarkWare launches privacy tokens that still allow compliance checks
- Binance Square — StarkWare and Sui compliance-ready privacy
- StarkWare — Official blog and Shieldnet documentation
This article is published for informational and educational purposes only. It does not constitute investment advice. Do your own research (DYOR) before making any decision.
