Build Private and Verifiable Off Chain Apps With ROFL I Bernhard Ruf

Thu, Oct 2, 2025, 12:00 AM

Bernhard Ruf from Oasis Protocol Foundation presents a workshop on building private and verifiable off-chain applications using ROFL (Runtime Offchain Logic). He introduces the blockchain dilemma—scalability, cost, speed, and especially privacy—and explains how Oasis addresses these with its confidential EVM chain, Sapphire, and TEEs (Trusted Execution Environments). ROFL enables developers to dockerize apps in any language, run them in TEEs for confidentiality, and access off-chain data or APIs verifiably. The workshop covers deploying apps using the Oasis CLI, registering and managing apps on-chain, and leveraging new CLI features for logs and machine management. A live demo shows deploying a Telegram bot with a private LLM inference in a TEE, emphasizing privacy and verifiable compute. Use cases include oracles, cross-chain apps, and private AI. The session concludes with resources and support for developers. 00:00 Introduction 00:51 Agenda Overview 01:18 Blockchain Dilemma & Privacy Challenges 02:29 Oasis Protocol & Sapphire Recap 03:36 Sapphire Features & Cross-chain Capabilities 04:00 Introduction to ROFL (Runtime Offchain Logic) 05:04 ROFL Architecture & Use Cases 06:25 Network Structure & TEEs 07:24 Cross-chain & External API Access 08:00 Dockerization & App Registration 09:19 App Deployment Process 10:25 CLI Tools & raw.app Platform 11:06 Live Demo: Private LLM Telegram Bot 12:14 Docker Compose & Secrets Management 13:06 Step-by-step App Deployment 14:12 Machine Sizing & Validation 15:34 On-chain Registration & Test Tokens 16:35 Building & Deploying the App 17:22 Platform-specific Build Notes 19:10 Final Deployment Steps 20:01 CLI Improvements & Troubleshooting 20:32 Documentation & Support 21:00 Conclusion _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 🇫🇷 *ETHGlobal Cannes* This workshop is specifically for ETHGlobal Cannes, a 3-day hackathon held July 4-6, 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 Cannes 2025 playlist here: https://youtube.com/playlist?list=PLXzKMXK2aHh5N2DCwhcEshNW9C8knZ1T-&si=Lc-WOyfkAVP2--R4 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ✅ *Follow Oasis Protocol* X: https://x.com/OasisProtocol ✅ *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 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _