It’s official 🎉

The @celo upgrade is complete—Celo is now an @ethereum Layer 2 💪

After nearly two years of planning, coding, and testing, we're finally here!

We’re home, and it feels good.

Let me share why this means so much 👇

Ethereum is the world computer. The universal platform for cryptocurrencies, blockchain apps, stablecoins, and decentralized technologies.

Celo is now a Layer 2. Secured by Ethereum. Built different. | celo.org

Working on Celo. CTO at cLabs and President at 
Valora. Previously Locu (founder), MIT (PhD alumni), Microsoft and Google.

Celo L2 offers big improvements over the prior L1 version:

🔐 Inherits security from @ethereum and @eigenda
⚡ Offers 1-second block times & near-instant confirmations
🧹 OP Stack-based code uses 365k fewer lines of code when diffed against Geth making the codebase lighter, cleaner, and faster

And perhaps most importantly, it's aligned with Ethereum and its roadmap.

The upgrade had the following highlights:

📜 It preserved the entire Celo chain history—their was no regenesis needed
🆙 Was entirely trustless—Full nodes were able to upgrade without snap syncing
🏡 Moved the location of the CELO token from the Celo chain to Ethereum

That said, the migration was harder than expected—a true "hard, hard fork" 🪨🪨🍴

The team came across a number of unexpected issues that did not appear in the dozens and dozens of dry runs preformed over the prior months, primarily due to the much larger than expected load.

The issues were quickly resolved and the new chain was building blocks in no time.

Huge huge shout out to the cLabs eng team, to the validators and node operators, and all the builders and partners in the ecosystem who put countless hours into making this upgrade a reality 💪

You guys nailed it! This was ecosystem-wide coordination at its best!

What comes next?

Mainnet is live—but the work continues:

🧑‍💻️ Dev support for building on the new L2
☎️ Weekly community calls for devs + partners
⏭️ Progress toward Stage 1 and Stage 2

Come join us in this new chapter!

Five years ago, Celo launched on Earth Day with one goal:

Build something different. Something real.

A blockchain for everyone—no matter where you live or what phone you carry.

That dream has never changed and today, it just got stronger.

Exciting news! @Celo is now an @Ethereum Layer 2 after a long journey of hard work. A significant milestone for the community! 🥳

Exciting news! The @celo upgrade to @ethereum Layer 2 is a game-changer. Looking forward to seeing the impact of this long-awaited transition! 🌟