Turning Words into Killer Apps Defi Actions On Flow I Ali Serag, b z and Brian Doyle

Thu, Oct 2, 2025, 12:00 AM

This session, "Turning Words into Killer Apps: DeFi Actions on Flow," explores the evolution and advantages of the Flow blockchain, a consumer-focused Layer 1 designed for scalable, user-friendly applications. Originating from the CryptoKitties phenomenon that exposed Ethereum's scalability limits, Flow now powers major apps like NBA Top Shot and Disney Pinnacle, supporting millions of users and transactions without network congestion. The talk introduces "Actions"—a new standard for composable, reusable onchain logic, enabling seamless interoperability and automation across DeFi protocols. Actions abstract protocol-specific details, allowing developers to build modular workflows (e.g., swaps, lending, staking) with minimal integration effort. The Cadence language’s unique features, such as resource-oriented programming and onchain scheduling (callbacks/agents), enable fully onchain automation, atomic transactions, and even unbounded loops, unlocking new possibilities for DeFi, gaming, DAOs, and subscriptions. Live demos illustrate how Actions and agents simplify complex workflows and empower developers to create innovative, scalable dApps. The session concludes with hackathon incentives and encouragement to build the next industry-changing app on Flow. 00:00 Introduction 00:40 What is Flow? 01:02 CryptoKitties & Ethereum Scalability 02:32 Flow’s Origins and Consumer Focus 03:32 Major Apps on Flow (NBA Top Shot, Disney, Ticketmaster) 04:18 Announcing Flow Actions 05:23 Automation & Onchain Agents 06:34 Challenges: Liveness, Inference, and Composability 08:51 The Power of Composability (Gaming & Mods Analogy) 09:49 What Are Actions? 10:56 Examples of Actions (Swap, Supply, Borrow, Stake) 11:43 Cadence Language Advantages 12:31 Live Swap Demo & Cadence Deep Dive 13:32 Atomic Transactions & Developer Benefits 14:35 Live Demo: Scheduled Callbacks & Agents 16:32 Callback Contract Walkthrough 18:43 Advanced Callback Example 21:44 Future Potential & Hackathon Tutorials 23:25 Onchain Automation Use Cases (DeFi, Gaming, DAOs) 24:25 Hackathon Prizes & Community Encouragement 25:59 Conclusion _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 🇺🇸 *ETHGlobal New York* This workshop is specifically for ETHGlobal New York, a 3-day hackathon held August 15-17, bringing together the most skilled web3 developers, designers and product builders from all around the globe for a weekend-long adventure to advance the Ethereum ecosystem! Watch the full ETHGlobal New York 2025 playlist here: https://www.youtube.com/playlist?list=PLXzKMXK2aHh4Xze0ZeSWCSGsw25clPpvZ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ✅ *Follow Ali Serag* X: https://x.com/AliSerag0 ✅ *Follow Flow* X: https://x.com/flow_blockchain ✅ *Follow ETHGlobal* X: https://x.com/ETHGlobal​ Warpcast: https://warpcast.com/ethglobal Website: https://ethglobal.com YouTube: https://www.youtube.com/c/ETHGlobal _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Are you interested in Ethereum development and entrepreneurship?_ 👉 Sign up for the next ETHGlobal event: https://ethglobal.com/events 🎁 Get exclusive access and perks with ETHGlobal Plus! https://ethglobal.com/plus 📣 Want us to throw an event in your city? Tell us where! https://ethglobal.com/city _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _