# Live on Unichain: Fair Transaction Ordering and MEV Protection (/docs/changelog/completed-notifications/live-on-unichain-fair-transaction-ordering-and-mev-protection)

Posted: May 1, 2025 | Effective: May 1, 2025

Unichain became the first L2 to build blocks inside a Trusted Execution Environment (TEE). This upgrade increased transparency in block building, reinforced priority ordering, mitigated extractive MEV, and introduced support for revert protection.

> [!NOTE]
> Powered by [Rollup-Boost](https://writings.flashbots.net/introducing-rollup-boost), the TEE-based block builder on Unichain was built by Uniswap Labs and Flashbots.

> [!NOTE]
> Learn more in the [blog post](https://blog.uniswap.org/rollup-boost-is-live-on-unichain) and [whitepaper](/whitepaper_unichain.pdf).