The long-awaited Dencun upgrade activated on Ethereum mainnet Wednesday at approximately 9:55 am ET — or the start of epoch 269568 if you’re following on-chain.

A scalability-focused upgrade, Dencun features EIP-4844 or Proto-Danksharding which carves out a dedicated data channel on Ethereum for layer-2 data, dramatically reducing the transaction fees on rollups.

But that’s not all. Dencun ships a total of 9 Ethereum Improvement Proposals (EIPs) in all, making it the largest single hard fork in terms of improvements shipped, according to Tim Beiko, who coordinates the Ethereum core developer calls, on the Ethereum Foundation livestream commemorating the event.

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