Vitalik Buterin Demonstrates 'Vibe Coding'-Based Anonymous Message Board on Aztec Network

On July 20, 2026, Ethereum co-founder Vitalik Buterin showcased a demo of an anonymous digital message board based on the Aztec Network. This demonstration was built applying the 'vibe-coding' technique, which has recently been emerging in the development community, and features a combination of zero-knowledge proof-based privacy and a moderation layer utilizing local LLMs (Large Language Models).

This project is noteworthy because Buterin personally adopted a method of generating code through natural language prompts instead of traditional programming syntax. Vibe coding is a method where a developer sets the structure and intent of the system—the 'vibe'—and AI performs the mechanical code writing. This allowed for the rapid implementation of prototypes for privacy tools with complex cryptographic structures.

Aztec Network is a Layer 2 (L2) solution that enhances privacy on Ethereum, serving as the core infrastructure to guarantee anonymity in this demo. Aztec, which is known to be supported by Vitalik Buterin, aims to achieve both 'public message board' functionality and 'personal privacy' by providing zero-knowledge infrastructure that allows post content to be public while keeping the author's address or identity private.

Considering that anonymity can be misused, Buterin introduced a three-stage management system combining on-chain moderation and AI-based filtering. This is an attempt to show that minimal social guidelines can operate even in a decentralized environment, focusing on technically solving the problem of low-quality content that anonymous message boards can have.

Vibe coding shifts the paradigm of software engineering from mechanical writing to high-level judgment. While AI generates functional code through large language models, developers spend more energy on 'judgment'—defining the system's architecture and security requirements and reviewing the AI's output.

Vibe coding represents a redistribution of where engineering effort is invested. While mechanical parts are automated, the judgment to deeply understand the system, guide AI correctly, and know when to take back control becomes even more important.

Aztec's zero-knowledge infrastructure serves as a foundation that provides users with complete privacy while maintaining the security of the Ethereum mainnet. This anonymous bulletin board demo utilized these ZK-L2 characteristics to present a concrete example of harmonizing the value of public records with individual rights to anonymity.

Technical Combination of Anonymity and On-chain Moderation

The moderation system introduced by Buterin implements decentralized social responsibility by appropriately balancing technical automation and human intervention. It is structured to maintain the health of the platform by managing the process before and after posts are recorded on the chain from multiple angles.

• Local LLM Flagging Daemon: Before a post is recorded on the chain, AI pre-scans for harmfulness based on the set 'vibe'.
• On-chain Moderation: Transparently manages the status of posts through moderation rules enforced at the protocol level.
• Censor Role: Maintains a monitoring system where humans can intervene for final judgment and governance.

These technical attempts are directly linked to Buterin's vision of 'Ethereum as a public bulletin board,' which he emphasized on March 12, 2026. He has argued that Ethereum should go beyond being a simple financial asset to become a reliable and censorship-resistant basic infrastructure for digital communication, and this demo proved the potential of self-sovereign infrastructure to realize that vision.

However, vibe coding-based applications face new security threats in the form of vulnerabilities in AI-generated logic. Security risks are real, to the point where professional services for fixing errors in apps created with vibe coding have already appeared in the market. For Ethereum to be reborn as the 'Year of Self-Sovereignty' in 2026, finding the optimal balance between this rapid development method and rigorous security audits is expected to be a major future challenge.