Aayush Gupta

ETHGlobal · Oct 9, 2025

Aayush Gupta presents Proteus and ZK Email, exploring how advanced cryptography can mitigate AI harms like deepfakes and misinformation. Learn why digital signatures, zero-knowledge proofs (ZKPs), and perceptual hashing are critical for verifying content authenticity in an AI-driven world. Discover how blockchain-based provenance systems can combat image forgery while preserving privacy through MPC (Multi-Party Computation) and FHE (Fully Homomorphic Encryption). If you're interested in AI safety, cryptographic identity, and decentralized verification, this talk offers cutting-edge insights into securing digital content. 00:00 - Introduction: Cryptography’s Role in the AI Era 00:50 - The Problem: Verifying Content Provenance 01:49 - Why Watermarking Fails Against Deepfakes 03:21 - Digital Signatures as a Robust Alternative 04:49 - Real-World Use Cases for ZK Email 05:48 - How ZK Email Works: Privacy-Preserving Proofs 06:16 - Practical Applications (Docs, Flights, GitHub) 07:36 - User Adoption & Proof Volume 08:01 - Why Image Metadata-Based Provenance Fails 09:37 - Flaws in C2PA & Timestamp Vulnerabilities 10:06 - Introducing Perceptual Hashing 11:34 - Proteus: Combining Signatures + Perceptual Hashing 12:29 - How Perceptual Hashing Resists Modifications 13:59 - DINO Hash: A Better Perceptual Hashing Model 14:28 - Building a Decentralized Provenance System 15:58 - Privacy Challenges in AI-Generated Content 16:28 - MPC/FHE for Private Provenance Lookups 17:51 - Backup AI Detection for Cold Start 18:16 - Benchmarking DINO Hash vs. Existing Solutions 19:14 - Adversarial Robustness in Perceptual Hashing 20:11 - Final Takeaways & Future Work 20:40 - Resources & How to Get Involved _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 🇹🇼 *Pragma Taipei* Pragma Taipei 2025 was held on April 3rd at POPOP in Taipei, Taiwan and was an in-person summit for builders and leaders in the web3 ecosystem. Watch the full Pragma Taipei YouTube Playlist here: ETHGlobal's Pragma series takes place in cities around the world, and is designed to be a different kind of event. Pragma is a one-stage conference with founders-only on stage, bringing together a small group of curated attendees and speakers to discuss the future of web3 and reflect on the past. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ✅ Follow Aayush Gupta X: https://x.com/yush_g ✅ Follow ZK Email X: https://x.com/zkemail ✅ Follow Kartik Talwar X: https://x.com/TheRealKartik ✅ Follow ETHGlobal X: https://x.com/ETHGlobal​ Warpcast: https://warpcast.com/ethglobal Website: https://ethglobal.com YouTube: https://www.youtube.com/@UCfF9ZO8Ug4xk_AJd4aeT5HA _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 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 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

ETHGlobal · Oct 9, 2025

Explore the next generation of Solidity development with Artur Chmaro as he introduces vlayer’s ZK superpowers at ETHGlobal Prague 2025. Learn how vlayer empowers Web3 developers with four groundbreaking features: Web Proofs, Email Proofs, Time Travel, and Teleport—tools that bridge off-chain Web2 data and on-chain verifiability using zero-knowledge proofs. Artur explains vlayer’s new prover-verifier execution model, how to build private, off-chain computations in Solidity, and how to verify them on any EVM-compatible chain. Discover how to integrate HTTP responses, email content, historical blockchain state, and cross-chain data directly into your dApps—without compromising security or UX. This talk also includes information on vlayer hackathon bounties, developer templates, and how to get started with your first zk-enabled dApp using vlayer’s powerful SDK. 00:00 Intro to vlayer superpowers at ETHGlobal Prague 00:32 Overview of four new Solidity superpowers 01:03 Web Proofs and Email Proofs explained 01:29 Time Travel and Teleport for cross-chain data 01:55 New prover-verifier Solidity execution model 02:33 Example: Board Ape ownership check using Time Travel 02:58 How verifier contracts validate prover logic 03:22 Web2 data onchain: Use cases for Web and Email Proofs 03:53 vlayer bounty categories and ideas for hackers 04:42 Getting started: Docs, templates, and setup 05:29 Closing remarks and happy hacking at ETHGlobal Prague _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 🇨🇿 *ETHGlobal Prague* This workshop is specifically for ETHGlobal Prague, a 3-day hackathon held May 30 - June 1 2025, 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 Prague 2025 playlist here: https://youtube.com/playlist?list=PLXzKMXK2aHh5Vv-ZobDU2YMWekDFYvOqd&si=SoQ5O2TOAK8RkYf- _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ✅ Follow *Artur Chmaro* X: https://x.com/ArtiChmaro ✅ Follow *vlayer* X: https://x.com/vlayer_xyz ✅ *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 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

ETHGlobal · Oct 9, 2025

Artur Chmaro introduces Vlayer's revolutionary ZK-powered tools for Solidity developers at ETHGlobal Prague 2025. Discover four groundbreaking superpowers: Time Travel (historical state access), Teleport (cross-chain state verification), Web Proofs (private web data verification), and Email Proofs (on-chain email authentication). Learn how to implement these features using familiar Solidity and Foundry tooling, with live demos of Twitter handle verification and Revolut transaction proofs. Perfect for developers building identity solutions, RWA tokenization, or cross-chain applications needing verifiable off-chain data. 00:00 - Introduction to Vlayer's 4 Developer Superpowers 00:51 - Time Travel: Accessing Historical Blockchain State 01:27 - Web Proofs: Private Data Verification with ZK 02:02 - Vlayer's Dual Contract Model: Prover vs Verifier 03:15 - Demo: Reading Historical NFT Ownership Data 04:25 - On-Chain Verification with OnlyVerified Modifier 05:35 - Advanced Time Travel: Calculating Token Averages 06:49 - Supported Chains: Ethereum, Base, Optimism 07:25 - Web Proofs Deep Dive: Revolut & Twitter Examples 09:14 - Browser Extension Demo: TLS Session Notarization 11:07 - Starter Templates & Local Development Setup 12:23 - Live Twitter Handle Verification Demo 14:59 - Data Redaction in ZK Proofs 16:12 - Email Proofs: On-Chain Email Authentication 18:43 - Getting Started: Vlayer CLI & Documentation 21:09 - Q&A: Prover/Verifier Deployment Architecture 22:31 - Chain Compatibility Explained 24:02 - Notary Trust Model & Security Assumptions _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 🇨🇿 *ETHGlobal Prague* This workshop is specifically for ETHGlobal Prague, a 3-day hackathon held May 30 - June 1 2025, 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 Prague 2025 playlist here: https://youtube.com/playlist?list=PLXzKMXK2aHh5Vv-ZobDU2YMWekDFYvOqd&si=SoQ5O2TOAK8RkYf- _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ✅ *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 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

ETHGlobal · Oct 9, 2025

The Mopro Workshop, led by Vivi Jeng from the PSC team at the Ethereum Foundation, introduces Mopro (Mobile Prover), a toolkit designed to simplify building mobile-native zero-knowledge (ZK) apps. Mopro provides Rust wrappers for various ZK proving systems, enabling cross-platform development for iOS, Android, and WebAssembly via UniFFI. Developers can use CLI tools, starter templates, and SDK management to quickly create privacy-preserving mobile apps leveraging protocols like Semaphore, ZK Email, and Circom. Example apps include ZK-based authentication, anonymous event participation, Aadhaar identity proofs, and geolocation proofs. The workshop highlights the advantages of mobile-native ZK apps—such as access to biometrics, GPS, NFC, and push notifications—over browser-based solutions. A hackathon with prizes encourages building client-side ZK proof-generating mobile apps using Mopro. Q&A covers use cases, technical requirements, and limitations like recursive proofs. 00:00 Introduction 00:59 What is Mopro? 01:40 Cross-Platform Rust Bindings 02:11 CLI Tools and Starter Templates 02:49 Mobile SDK Management 03:19 Getting Started with Mopro CLI 03:55 Creating Example Apps with Mopro 04:44 Updating Circuits and Custom Functions 06:07 Exporting Custom Functions with UniFFI 06:46 Updating Bindings and Platform Integration 07:30 Example Apps Overview 08:13 ZK Authentication and Internal Chat Example 08:49 Zuma: Anonymous Event Participation 09:21 Aadhaar Identity Proof Example 10:20 Geolocation Proof Example 11:01 Onchain Verifier Integration 11:46 ZK Protocols and App Ideas 12:23 Social, Gaming, and Transaction Use Cases 13:11 Prize Structure and Hackathon Requirements 13:48 Mobile Capabilities vs. Browser Apps 15:07 Community Support and Documentation 16:28 Q&A: Push Notifications Use Case 17:07 Q&A: Mobile vs. Web App Experience 18:34 Q&A: Expo/React Native Compatibility 18:55 Q&A: Proof Generation Requirements 19:45 Q&A: Recursive Proofs Limitation _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 🇫🇷 *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 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 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Phil Zimmermann

Web3 Summit 2024 · Aug 19, 2024

Listen to the creator of PGP talking about Decentralized Privacy Protocols in a Centralized Ecosystem The video features a speaker discussing their experience in the tech industry, emphasizing a preference for bottom-up design over top-down approaches. They recount working on an automated tape library system in the 1980s and how that project's design philosophy influenced their later work on PGP (Pretty Good Privacy), a cryptographic software. The speaker highlights the challenges faced while developing PGP, including financial struggles and the omission of a trust model in PGP 1.0 due to time constraints. They also touch on the legal issues surrounding PGP, stemming from patent conflicts with RSA Data Security and subsequent federal investigation. Additionally, the speaker reflects on the early days of email protocols and how they were designed to be decentralized, contrasting it with the siloed nature of modern VoIP services despite using similar encryption protocols. They express skepticism about the necessity of blockchains for achieving decentralization but maintain a strong interest in decentralized systems. The speaker clarifies that when they refer to "crypto," they mean cryptography, not cryptocurrency, and shares anecdotes about their involvement in various projects and protocols over the years.