Exploring Privacy Trade-offs and Challenges on Public Blockchains

The Ethereum Foundation published a talk by Zachary Williamson titled Private State, Public Network: The Tradeoffs Behind Privacy. The session covers how public blockchains require public data and execution, while various technologies aim to obfuscate information to hide transaction intent and data. Private execution faces distinct challenges at application boundaries, including fees, node queries, timing, and public calls that can make hidden payloads linkable. Additionally, private user-controlled state creates consent challenges when transaction architectures allow decentralized applications to read contract state. The presentation compares current technology trade-offs for enabling private transactions on public networks and examines the future of blockchains that enshrine privacy as a core value.