How to Build NFT-Gated Quadratic Voting with Octant v2 Hooks | Octant DeFi Devs Day

Description

Speakers: • Mudi is the Lead of Tech at Octant, overseeing the technical architecture and development of the protocol. // TIMESTAMPS // 00:00 - Introduction: Connecting the Lego Blocks of Octant v2 00:30 - The Goal: Building an NFT-Gated Quadratic Voting Mechanism 01:00 - How Quadratic Voting (QV) Works 02:01 - High-Level Architecture: Using Hooks to Customize Core Logic 03:09 - The Power of Hooks: 12 Customizable Functions 03:33 - How to Build NFT-Gated QV with Just Two Hooks 04:43 - The getVotingPower Hook: Assigning Fixed Power to NFT Holders 05:23 - What You Get for Free: User Actions & Proposal Management 06:31 - The Big Picture: A Fully Trustless End-to-End Funding Flow 07:33 - The "Alpha" Parameter: Tuning Your Governance from Linear to Quadratic 09:07 - Security Considerations: The Game Theory of Voting 10:20 - The Sybil Attack Problem with Naive NFT Gating 11:07 - The Solution: Soul-Bound NFTs or ERC-721 Votes 12:58 - The Final Code: A Complete NFT-Gated QV Contract in a Few Lines 13:43 - Important: Choosing the Right NFT Gating Pattern 14:29 - More Hackathon Ideas: Tiered Power, Reputation Integrations & More 15:00 - Pro Tip for Testing in Foundry: warp, Don't roll 16:31 - Hackathon Brainstorm: What Would Be Cool to See? 17:16 - Hackathon Pro Tip: Always Have a Designer on Your Team 22:39 - The Octant v2 Repo is Now Public! In the closing session of DeFi Devs Day, Octant's Lead of Tech, Mudi, delivers a masterclass on how to assemble the "Lego blocks" of Octant v2 to create sophisticated governance systems. This workshop provides a practical, hands-on walkthrough of building one of the most requested features for DAOs and online communities: NFT-Gated Quadratic Voting. Mudi demonstrates how developers can use Octant's powerful hook system to implement this complex mechanism with just a few lines of Solidity code. The session dives into the core concepts, including the trade-offs between different NFT-gating patterns (e.g., simple balance checks vs. ERC-721 Votes) and how to prevent common game-theory exploits like Sybil attacks. Mudi also demystifies the "moon math" of Quadratic Funding by explaining the alpha parameter, a simple knob that allows builders to tune their governance anywhere on the spectrum from pure linear voting to pure quadratic voting. This is a must-watch for any developer looking to build powerful, flexible, and secure governance for their community. This workshop was part of DeFi Devs Day at the Octant DeFi Summit 2025, a two-day event that brought together the brightest minds in the industry to discuss and build the future of decentralized finance. About Octant: Octant is infra for sustainable growth, powered by DeFi and aligned with Ethereum. To date, Octant funding rounds have sustainably funded hundreds of projects (over $7 million USD in grant funding) over 9 epochs, all through staking rewards. Follow the Organization: • Octant: https://x.com/OctantApp Keywords: Octant, Quadratic Voting, NFT Gating, Hooks, DeFi, Governance, DAO, Smart Contracts, Solidity, ERC-721, Public Goods Funding, Hackathon, DeFi Development