# Deep-Dive Into One-Step Proofs in Arbitrum | Tsahi Zidenberg - Offchain Labs

- Channel: [Ethereum Denver](https://streameth.org/ethereum-denver)
- Date: 2025-10-09
- Duration: 20:07
- Topics: ETHDenver, Crypto, Web3, Blockchain, Event, Conference, ETHDenver 2025, ETHDenver 2024, Bitcoin, Ethereum
- Watch: https://streameth.org/watch/yt-J37P0-OYzXk
- YouTube: https://www.youtube.com/watch?v=J37P0-OYzXk

## Description

At the base of any optimistic rollup, and specifically Arbitrum, there is a one-step-proof. This is the basic step that can be proven with one transaction on the parent chain.
We will show exactly what a one-step-proof actually proves and how it does that. There will be code excerpts in both solidity and rust.

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