# zkAttestor: Block and State Attestations on Ethereum, Applied ZK - Day 1

- Channel: [Ethereum DEV NL](https://streameth.org/ethereum-dev-nl)
- Date: 2022-10-07
- Duration: 18:21
- Watch: https://streameth.org/watch/yt-2-yYtEJdrFY
- YouTube: https://www.youtube.com/watch?v=2-yYtEJdrFY

## Description

This talk presents zkAttestor, a project to produce trustless zkSNARK-based on-chain attestations to data from any Ethereum state or block. These attestations are trustlessly verified on-chain in a smart contract which caches historical block hashes.  We envision use cases including identity, dapp primitives involving history, and on-chain reputation.

Speaker(s): Yi Sun

Hosted at Devconnect Amsterdam, 2022
Visit the website: https://devconnect.org/
Or follow @EFDevconnect on Twitter