Ethereum co-founder Vitalik Buterin has introduced a comprehensive nine-step roadmap aimed at significantly improving privacy for users on the Ethereum blockchain. Shared in a detailed April 10 blog post, Buterin’s plan outlines a “maximally simple L1 privacy roadmap” that can enhance user confidentiality without overhauling Ethereum’s consensus mechanism.
Shielded Balances and Private Transfers by Default
At the heart of Buterin’s proposal is integrating shielded balances directly into popular Ethereum wallets. These balances would enable users to send private transactions by default, eliminating the need for third-party privacy wallets.
“Wallets should have a notion of a shielded balance,” Buterin explained, adding that there should be a “send from shielded balance” feature, ideally switched on automatically. Tools like Privacy Pools and the Railway Private DeFi Wallet inspire the model.
One Address Per App: Privacy vs. Convenience
Buterin also proposed adopting a “one address per application” standard to reduce linkability between different apps used by the same person. While acknowledging this change would create some “significant convenience sacrifices,” he believes it’s a crucial step to achieving default privacy across the Ethereum ecosystem.
This approach is well-suited for in-app wallets and mimics workflows used in cross-chain interoperability, such as depositing funds from multiple sources into a different chain.
To support this privacy-centric architecture, send-to-self transfers would need to become privacy-preserving by default.
Short-Term and Long-Term Infrastructure Changes
To enhance privacy in the short term, Buterin recommends integrating Trusted Execution Environment (TEE)-based RPC privacy into wallets. However, he clarified that TEEs are not a permanent solution and should eventually be replaced by Private Information Retrieval (PIR) — a more robust cryptographic method that is currently not scalable for large datasets.
In the interim, Buterin suggests users connect to multiple RPC nodes—potentially through a mixnet—with a different RPC node for each decentralized application (DApp).
Developer-Friendly Tools and Shared Proof Systems
Buterin’s roadmap also calls for streamlined development support for privacy-enhancing platforms like Tornado Cash and Railway, proposing new tooling and architecture that facilitate easier operation and maintenance of privacy protocols.
Moreover, he suggests working on infrastructure that allows multiple private transactions to share a single on-chain proof, which could reduce costs and improve scalability for privacy-focused applications.
The End Goal: Resilient Privacy Against RPC-Level Attacks
Ultimately, the roadmap aims to shield user activity from adversaries, including those operating RPC nodes. Buterin also touched on the importance of developing privacy-preserving keystore wallets as part of the broader effort to bolster Ethereum’s privacy model.
Disclaimer: This article is for informational purposes only and does not constitute financial advice. Cryptocurrency investments are volatile and risky. Always conduct your research before making any investment decisions.
