Adding unichain mainnet post (#208)

* Update authors.yml

Added Ferran

* Builder Playground images

* Rename Builder Playground_diagram.png to Builder_Playground_diagram.png

* Create 2024-04-07-builder-playground.mdx

* Update and rename 2024-04-07-builder-playground.mdx to 2025-04-07-builder-playground.mdx

Fixed date & title

* Create 2025-05-02-unichain-mainnet.mdx

* Update 2025-05-02-unichain-mainnet.mdx

Author: freddmannen

content/2025-05-02-unichain-mainnet.mdx

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+---
+slug: unichain-mainnet
+title: The First L2 TEE Block Builder is Live on Unichain Mainnet
+authors: [flashbots]
+tags: [rollup-boost, layer2, builder]
+hide_table_of_contents: false
+forum_link: https://collective.flashbots.net/t/the-first-l2-tee-block-builder-is-live-on-unichain-mainnet/4917
+---
+# Unichain x Rollup-Boost
+
+**We are excited to announce Unichain is the first L2 to release Rollup-Boost and deploy TEE block building on mainnet!**
+
+<!--truncate-->
+
+[Rollup-Boost](https://writings.flashbots.net/introducing-rollup-boost) upgrades the performance, programmability, and decentralization of L2s through an open marketplace for innovative extensions. Rollups become cheaper, faster, and more decentralized with Rollup-Boost. It gives L2s control and customizability over their block building modules to enable high-performance features such as fast confirmation times, strong user guarantees, and MEV internalization.
+
+Through Rollup-Boost, L2s can upgrade to high-powered TEE block building for additional performance capabilities that will drive the next generation of Defi apps and accelerate the L2 roadmap.
+
+Rollup-Boost on Unichain mainnet unlocks a few groundbreaking milestones on the L2 roadmap to decentralization:
+
+1. Unichain is one of the first L2s with an external block builder – a major step towards decentralization
+2. Unichain’s external block builder is operating in a Trusted Execution Environment (TEE), a first of its kind on L2
+3. Unichain is the first L2 to launch revert protection on mainnet
+
+While blocks built in TEEs and verifiable priority ordering combine to give users increased confidence in their DeFi experience, one of the most important features of Rollup-Boost is built-in revert protection. Revert protection reduces friction for users, improves the efficiency of DeFi systems such as AMMs, and lowers the chance of a user paying for failed transactions.
+
+Flashbots and Uniswap Labs will continue to research and develop new features for Unichain to make it the home for DeFi. The Unichain x Rollup-Boost roadmap includes 200ms Flashblocks and public attestations for TEE ordering verifiability.
+
+## Testing Rollup-Boost on Unichain
+
+Our engineering team strives to meet new challenges head on. Running the first external block builder for a L2 in a TEE is no small feat and our team developed a few critical tools for testing L2s in as realistic conditions as possible.
+
+Blockchain client performance engineering requires both extensive expertise and it is relatively time-consuming and costly. Using [Contender](https://collective.flashbots.net/t/contender-upgrades-april-2025/4905), a testing tool that can reliably and repeatably simulate transactions and bundles on real-world chain state to produce realistic benchmarks, Flashbots was able to [benchmark](https://htmlpreview.github.io/?https://github.com/zeroxbrock/official-contender-reports/blob/main/reports/unichain-sepolia_2025-04-25/report-25-25.html) time to inclusion, gas usage, and other critical metrics prior to going live on mainnet with Rollup-Boost.
+
+Flashbots is accelerating L2 R&D and we invite the community to join the amazing teams already building and contributing to Rollup-Boost:
+
+* OP
+* Unichain
+* Base
+* World
+* Conduit
+* Gelato
+* Nethermind
+* and more!
+
+*To dive deeper into Rollup-Boost and what’s coming next, check out:*
+
+* [Rollup-Boost Github](https://github.com/flashbots/rollup-boost?tab=readme-ov-file#readme)
+* [TEE Validity Proofs for OP Stack](https://collective.flashbots.net/t/automata-flashbots-tee-validity-proof-for-op-stack/4059)
+* [Introducing Rollup-Boost - Launching on Unichain](https://writings.flashbots.net/introducing-rollup-boost)
+* [Unichain Whitepaper](https://docs.unichain.org/whitepaper.pdf)
+* [Contender Upgrades: April 2025](https://collective.flashbots.net/t/contender-upgrades-april-2025/4905)