Preface

Privacy is back on the agenda for Ethereum developers and the broader blockchain community. After years in the background while scaling, regulatory scrutiny, and other priorities took center stage, privacy-focused work is resurfacing as a central topic. This article explains why that shift is occurring, profiles recent proposals and frameworks, and examines the competing visions for how privacy should fit into public blockchains. By outlining trade-offs between transparency, compliance and usability, the piece aims to give readers a clear sense of the technical possibilities and design debates that will shape the next generation of token standards on Ethereum.

Lazy bag

Key takeaways: pERC-20 introduces encrypted token notes to hide balances and transfers; projects like STRK20 push privacy deeper into DeFi. Designers seek a middle ground where privacy coexists with compliance and usable user experiences.

Main Body

For much of crypto’s history, transactional privacy was touted as a defining promise: blockchains could provide pseudonymous or confidential value transfer, giving users control over which financial details were public. Over time, however, attention shifted. Scaling, smart contract innovation, and regulatory scrutiny of privacy tools relegated many confidentiality efforts to niche projects. That is now changing. A new wave of proposals and protocols is asking whether public blockchains should continue to expose every on-chain financial interaction by default, and if not, how privacy can be introduced without undermining auditability and compliance.

A notable recent proposal is pERC-20, which reimagines the default token standard on Ethereum. Unlike the widely adopted ERC-20 standard—where balances, transaction histories and counterparties are visible on-chain—pERC-20 would represent tokens as encrypted cryptographic "notes." These notes behave more like digital cash: transfers can be verified by the network without revealing the underlying amounts or the identities of participants. The approach aims to preserve key assurances such as the integrity of transfers and the inability to create tokens out of thin air while hiding sensitive transactional details from public inspection.

Crucially, the pERC-20 concept balances confidentiality with transparency in certain respects. The total token supply would remain publicly visible so anyone can confirm that the circulating supply hasn’t been clandestinely inflated. Additionally, the proposal contemplates compliance mechanisms: issuers could cryptographically freeze or blacklist particular notes when required, enabling targeted intervention without exposing ordinary users’ histories. This hybrid model reflects a broader philosophical shift: privacy and compliance need not be binary opposites but can be engineered to coexist in ways that serve both individual and systemic needs.

At the same time, other projects are arguing that payments privacy is only the first step. Starknet’s STRK20 framework is designed to extend confidentiality beyond single transfers and into decentralized finance primitives such as lending, staking and token swaps. By layering a privacy-preserving architecture underneath DeFi interactions, STRK20 aims to let users perform complex financial operations while keeping position sizes, balances and counterparties confidential.

According to developers behind these efforts, cryptography is not the main barrier today; usability is. Privacy-preserving systems have historically suffered from poor user experience: slow wallet syncs, convoluted transaction flows, and limited interoperability with mainstream tooling. That matters because privacy systems require broad participation to be effective. If only a handful of users adopt a privacy layer, it becomes much easier to de-anonymize participants. As a result, many builders emphasize that improving UX—wallet integration, fast proofs, seamless dApp interactions—is as important as the underlying cryptographic advances.

The design differences between pERC-20 and STRK20 illustrate competing visions for privacy on public chains. One approach focuses on making peer-to-peer token transfers confidential while leaving broader system transparency largely intact. The other aims to embed privacy as a foundational layer across multiple financial operations and decentralized applications. Each path carries trade-offs. A payments-centric model may be easier to adopt quickly and to reconcile with existing compliance expectations. A full-stack privacy layer could better protect users’ complex financial activity but may face tougher integration, performance and regulatory questions.

Regulatory context also looms large. Tools that obscure transaction details have drawn attention from authorities in multiple jurisdictions. By making compliance features an integral part of privacy-first standards—such as cryptographic blacklists or issuer-controlled freezes—designers hope to reduce friction with regulators while preserving user confidentiality for routine activity. Whether those mechanisms will satisfy regulators and institutions is uncertain, and they may lead to complex governance choices about who controls compliance keys and how they are audited.

Technical considerations further complicate deployment. Privacy constructions often rely on zero-knowledge proofs, encryption schemes, and careful state management to avoid leaking metadata. Performance and cost trade-offs must be managed so solutions remain practical on Ethereum and Layer 2 networks. Interoperability with existing DeFi protocols and tooling is also critical: privacy that isolates itself risks remaining a niche, while broad adoption will require composability and standards that developers can plug into without rebuilding core infrastructure.

Despite these challenges, the renewed focus on privacy is a significant cultural shift. Instead of relegating confidentiality to specialized coins and services, the conversation is now happening around mainstream infrastructure, token standards and institutional use cases. That momentum is reflected in multiple ongoing initiatives and active debates in protocol governance spaces.

It remains to be seen whether pERC-20 or any single proposal will become the dominant standard. Like other Ethereum Improvement Proposals, pERC-20 must undergo extensive review, iteration and community buy-in before it can be widely adopted. Still, the simultaneous emergence of standards like pERC-20 and frameworks such as STRK20 indicates a renewed prioritization of privacy by developers and organizations building on Ethereum and Layer 2s.

Ultimately, the direction privacy takes will be shaped by technical advances, UX improvements, regulatory responses, and how well projects balance confidentiality with the transparency and auditability that underpin public blockchains. What’s clear is that privacy is no longer a peripheral topic: it has reentered the mainstream conversation and will play a central role in how token standards and DeFi evolve.

Key Insights Table

No promotional content is included. The article aims for neutral explanation and clear transitions between concepts, balancing technical detail with accessible analysis.