# Artur Chmaro I vlayer Workshop I ETHGlobal Prague 2025

- Channel: [ETHGlobal](https://streameth.org/ethglobal)
- Date: 2025-10-09
- Duration: 25:00
- Topics: Vlayer, zero knowledge proofs, ZK proofs, Solidity development, historical data access, cross-chain verification, web authentication, email verification, TLS notarization, Foundry, EVM compatibility, Revolut proofs, Twitter verification, RWA tokenization, identity solutions, smart contract security, blockchain oracles, private data, on-chain verification, developer tools, ETHGlobal, time travel blockchain, teleport protocol, web3 authentication, DApp development
- Watch: https://streameth.org/watch/yt-WQCuqO7T0ZY
- YouTube: https://www.youtube.com/watch?v=WQCuqO7T0ZY

## Description

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

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🇨🇿 *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-

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Website: https://ethglobal.com
YouTube: https://www.youtube.com/c/ETHGlobal 

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_Are you interested in Ethereum development and entrepreneurship?_
👉 Sign up for the next ETHGlobal event: https://ethglobal.com/events
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