Vitalik Buterin unveils Aztec moderation demo for anonymous Ethereum posting

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Buterin unveils Aztec moderation demo

Highlights

Vitalik Buterin unveiled an Aztec-based anonymous Ethereum posting demo, where users deposit ETH on Layer 1 and anonymously post on Layer 2.
Posts require deposits, with cooldowns tied to deposit size—0.001 ETH enables one post per hour, while 0.01 ETH enables ten—enforcing rate limits.
The project features onchain, AI-assisted moderation and formal verification of censorship, privacy, and deposit safety, though it remains early-stage with access-control issues outstanding.

Aztec demo architecture and moderation design

As first reported by The Block, Buterin shares the project on Farcaster on Sunday and describes it as a "vibe-coded" toy version of the anonymous billboard with moderation concept he outlined in a 2022 blog post. The code is publicly available on GitHub under his vbuterin account.

The system is built on Aztec, with users depositing ETH on Ethereum's base layer, posting messages anonymously on Layer 2 and later withdrawing their ETH back to Layer 1. According to the repository, posts do not expose a sender address in public call data and cannot be linked publicly to the original deposit.

Buterin also says in a follow-up Farcaster post that Aztec has reached stage 2, the most decentralized tier on the Layer 2 maturity scale. The design includes a censor role set at deployment that can flag posts as immoral, hiding them from the default feed and imposing a time-lock penalty on the poster's next message.

A local LLM daemon monitors the board and evaluates each post against an onchain moderation policy, the documentation says. That policy is stored onchain and is readable by the app, the command-line interface and the daemon.

Security model and broader crypto implications

Posting is controlled through a cooldown model that shrinks as the deposit grows, meaning 0.001 ETH allows one post per hour while 0.01 ETH allows ten, according to the repository. The project also includes formal verification, with documentation saying security properties covering rate limits, censorship screening, privacy and deposit safety are proven in Lean 4 across 70 theorems with no unproven gaps.

The repository describes the work as early and incomplete, with open issues including access-control fixes and untested browser flows. Even so, Buterin says the demo can already do very interesting nontrivial stuff, signaling continued experimentation around privacy-preserving social infrastructure and moderation tools in the Ethereum ecosystem.

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