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Vitalik Buterin, the co-founder of Ethereum, shared a working prototype on July 19 that combines zero-knowledge proofs, ETH deposits, and AI-powered content moderation into a single experimental application built on the Aztec Network.
The concept is deceptively simple. Users can post messages anonymously to a shared billboard while a system ensures nobody posts anything that violates community policies. The twist: moderators never learn who posted what, even when flagging problematic content.
How the anonymous billboard actually works
The demo, hosted on Buterin’s GitHub under the repository vbuterin/aztec_experiments, revives an idea he first floated in a 2022 blog post. Back then, he outlined how organizations could build controlled anonymous platforms using cryptographic methods called SNARKs, which stands for Succinct Non-Interactive Arguments of Knowledge.
SNARKs let you prove something is true without revealing the underlying information. Think of it as showing a bouncer your ID proves you’re over 21 without the bouncer actually seeing your birthdate, name, or address.
The new prototype layers several components together. Users make ETH deposits to participate, which creates a financial disincentive against spam and abuse. An AI system then scans posts for policy violations. And the zero-knowledge proof architecture ensures that even when the AI flags something, the poster’s identity stays cryptographically shielded.
Buterin described the project as a rapid “vibe-coded” experiment. He acknowledged the demo contains “nontrivial” functionality but stressed it remains under active development. There are no plans for a production deployment or a token launch.
Why Aztec is the right playground for this
Aztec is a privacy-focused Layer 2 zkRollup built on Ethereum that enables confidential transactions and private smart contracts. Unlike most Layer 2 solutions that focus primarily on scaling transaction throughput, Aztec’s core selling point is programmable privacy, all while settling back to Ethereum’s main chain for security.
The broader context here matters. Privacy in crypto has been a contentious topic, particularly after US regulators sanctioned Tornado Cash in 2022 and pursued legal action against its developers. Buterin’s demo attempts to thread that needle by showing that anonymous systems can still have enforceable rules.
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