Public blockchains are facing a resurgence in demand for transaction confidentiality, sparking intense development of new cryptographic frameworks. We wrote this article for blockchain developers, decentralized finance users, and institutional researchers seeking to understand how confidentiality can coexist with public ledgers. Understanding these emerging standards is essential because they will dictate how digital asset management, user data security, and regulatory compliance in the coming years.
Quick Answer
What is pERC-20?
It is a proposed Ethereum token standard that uses encrypted cryptographic "notes" to keep balances and transfer amounts confidential, as reported in the CoinDesk article Ethereum Developers Propose New Privacy-Focused Token Standard pERC-20.
How does pERC-20 work?
It operates like digital cash by shielding sensitive transaction data on-chain while allowing the underlying network to mathematically verify that funds are valid and not counterfeited, according to the KuCoin news release Ethereum Developers Propose New Privacy-Focused Token Standard pERC-20.
What Is pERC-20?
The pERC-20 framework is an experimental Ethereum Improvement Proposal designed to fundamentally alter how standard tokens operate on public networks. Standard ERC-20 tokens function like open ledgers where wallet addresses, token balances, and entire transaction histories are visible to any observer. In contrast, pERC-20 aims to encrypt these sensitive details so that interacting with a blockchain feels like using physical cash. By adopting this standard, assets can shield individual user data from public view.
How Does It Work?
Under the pERC-20 standard, tokens exist as encrypted cryptographic notes rather than cleartext balances, as outlined by KuCoin. When a user transfers tokens, the system generates proofs that validate the transaction without revealing the sender, receiver, or transferred amount to the public. The underlying network mathematically verifies these proofs to ensure no rules were broken or funds altered. Additionally, a compliance backdoor allows issuers to freeze specific notes through a cryptographic blacklist without compromising the privacy of innocent users, as detailed by Binance.
The STRK20 Framework
Starknet recently launched STRK20, a privacy-focused token framework designed to extend confidentiality beyond simple payments into decentralized finance applications, according to The Defiant article Starknet Launches STRK20 Privacy Layer, Bringing Shielded ERC-20 Balances and Transfers to Ethereum L2. Rather than shielding a single asset, this framework allows users to manage multiple tokens in a unified privacy layer. Users can execute trades, borrow assets, and participate in staking pools without exposing their identities, as stated in Starknet's official blog post Make ERC-20 Tokens Private on Starknet with STRK20. Furthermore, the framework uses post-quantum secure cryptography to protect against future decryption threats, per The Defiant.
The UX Bottleneck
Historically, privacy-oriented cryptocurrencies have suffered from severe usability issues, including slow wallet synchronization and cumbersome transaction flows, as noted by CoinDesk. StarkWare co-founder Eli Ben-Sasson stated that the biggest obstacle for privacy tech is user experience, rather than the cryptography itself. If a privacy system has a poor user experience, very few people will adopt it, which destroys the anonymity set required for the privacy to function properly, according to KuCoin. Privacy networks rely on broad sets of participants—typically requiring thousands of active users—to obscure individual transactions, meaning that a clunky interface directly compromises security.
Privacy vs. Compliance
A persistent challenge in the blockchain sector has been reconciling user confidentiality with regulatory anti-money laundering requirements, per The Defiant. The pERC-20 and STRK20 designs reflect a paradigm shift where privacy and compliance are treated as complementary rather than mutually exclusive. For instance, STRK20 implements an encrypted viewing-key framework where a designated third-party auditing entity can trace specific transaction histories if presented with a valid legal request, according to Starknet documentation. This scoped access grants privacy by default while maintaining financial accountability when legally mandated.
Current Status
As of June 2026, these privacy solutions are progressing through different stages of adoption and mainnet deployment, according to industry reports. The pERC-20 proposal remains an experimental standard that must pass through an extensive review process before seeing widespread adoption on the Ethereum base layer, per CoinDesk. Meanwhile, Starknet launched the first phase of its STRK20 framework, bringing shielded balances and private swaps to its layer-2 network, as reported by The Defiant. Developers are actively building software development kits to expand private lending and cross-chain capabilities into the next phases.
Comparison of Emerging Privacy Standards
• Asset Scope: pERC-20 focuses primarily on individual token transfers drawing on Zcash concepts, whereas STRK20 unifies multiple ERC-20 assets under a single privacy layer for complex decentralized finance interactions, per CoinDesk and Starknet official blogs.
• Underlying Architecture: pERC-20 is an Ethereum Improvement Proposal tailored for the Ethereum mainnet, whereas STRK20 leverages Starknet's validity rollup and Cairo codebase to process off-chain proofs, according to The Defiant.
• Compliance Mechanisms: Both systems retain compliance pathways; pERC-20 relies on issuer-controlled cryptographic blacklists, while STRK20 utilizes encrypted viewing keys accessible by designated third-party auditors, per KuCoin and Starknet announcements.
• Future-proofing: STRK20 incorporates post-quantum secure cryptography to prepare for quantum computing advancements, a feature not explicitly prioritized in the initial pERC-20 proposal, according to The Defiant.
FAQs:
Q: Will pERC-20 entirely replace standard ERC-20 tokens?
No, it will remain an optional standard alongside traditional transparent tokens, allowing the ecosystem to choose between absolute transparency or confidential transacting depending on specific use cases and regulatory needs.
Q: Will pERC-20 transactions increase Ethereum gas fees?
Yes, processing complex cryptographic proofs introduces higher computational overhead on the network, meaning users should expect increased transaction costs to accommodate the advanced privacy features.
Q: Can pERC-20 tokens be stored on standard hardware wallets?
Yes, the underlying keys can be secured by hardware devices, but signing and viewing the encrypted transaction payloads will require dedicated interface and firmware updates from wallet providers.
Q: Could pERC-20 face delistings from centralized exchanges?
Centralized exchanges may struggle to support these tokens due to strict regulatory compliance and anti-money laundering laws, which often require full transparency of asset histories and balances.
Q: Will users need a special wallet to hold pERC-20?
Standard Web3 wallets will require integration upgrades or specialized decentralized application interfaces to parse and interact with the encrypted notes properly.
Conclusion
The emergence of pERC-20 and STRK20 demonstrates that the blockchain industry is successfully moving beyond controversial mixing services to build enterprise-grade, compliant privacy infrastructure. We suggest that readers closely monitor the Ethereum Improvement Proposal review process and layer-2 adoption metrics to see how these standards mature. Ultimately, integrating robust confidentiality with auditable compliance will determine whether public blockchains achieve mainstream institutional adoption.
About the Article
Authored by Cornell Rachel to help readers comprehend the technical and regulatory nuances shaping the next era of on-chain financial privacy. Analysis methodology relies on the systematic synthesis of primary technical documentation, developer repositories, and real-time network upgrade announcements.
