After years of being sidelined by scaling efforts and regulatory pressure, privacy in blockchain transactions is re-emerging as a top priority — this time with institutional-grade stablecoins as the key driver. A pair of recent developments highlights the shift: a new Ethereum token proposal called pERC-20 and the mainnet launch of Starknet's STRK20 framework, both aimed at enabling confidential transfers while preserving compliance hooks.
The absence of native confidentiality on public ledgers has long been a deal-breaker for banks, hedge funds, and corporate treasuries. Because every address, balance, and transfer is immutably visible, competitors can analyze an institution's treasury movements in real time using blockchain analytics. This exposure conflicts with data protection laws like GDPR and banking secrecy regulations, which classify transaction data as protected commercial information. As one analysis put it, "no Chief Compliance Officer would approve exposing their entity's treasury movements to immediate, unrestricted public scrutiny."
The solution, advocates argue, is not full anonymity but selective disclosure — using zero-knowledge proofs or confidential transactions to hide sensitive details from competitors while allowing regulators or auditors to hold master keys. This model would let an institution prove it is compliant without revealing exact amounts or counterparties, actually making oversight more efficient.
The pERC-20 proposal from Ethereum developers directly addresses this. Unlike traditional ERC-20 tokens that display balances onchain like public bank accounts, pERC-20 tokens would exist as encrypted cryptographic "notes," similar to digital cash. The total supply remains visible so no one can secretly mint tokens, and a compliance mechanism lets issuers freeze specific notes via a cryptographic blacklist without exposing ordinary users. The design marks a broader recognition that privacy and compliance are not mutually exclusive.
Similarly, Starknet's STRK20 framework, which went live earlier this week, pushes the concept further by extending confidentiality to DeFi applications such as lending, staking, and token swaps. Eli Ben-Sasson, co-founder of StarkWare, emphasized that the biggest obstacle is not cryptography but user experience. "If the UX is bad, very few users are going to be using it," he told CoinDesk, noting that a small user base undermines the privacy guarantees anonymity sets provide. The STRK20 framework supports multiple assets under a unified privacy layer and uses post-quantum secure cryptography, preparing for future computing advances.
The two approaches reveal an emerging debate: one vision focuses on making payments private while leaving other activity transparent; the other aims to make privacy a foundational layer for an entire financial ecosystem. Either way, the discussion signals a strategic fork in the stablecoin market. The dominant stablecoins — USDC and USDT — have yet to present credible roadmaps for such confidentiality, while banking consortia like Partior (backed by DBS, J.P. Morgan, and Temasek) are already building dollar settlement systems with native privacy. As institutional demand grows, the lack of a programmable confidentiality layer may relegate existing transparent stablecoins to retail and DeFi use only.
