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Goerli Dencun Announcement | Ethereum Basis Weblog

  • The blobs are coming: Dencun will go reside on Goerli at 6:32 UTC on January 17, 2024.
  • Dencun shall be Goerli’s final improve earlier than core groups cease supporting it. Extra on this in a earlier submit.
  • Assuming the Goerli improve goes effectively, the Sepolia and Holesky testnets will activate Dencun over the following few weeks.
  • To obtain an electronic mail alert for community improve bulletins, subscribe right here.

The Dencun community improve is scheduled to activate on the Goerli testnet at 6:32 UTC on January 17, 2024. The improve consists of a number of modifications, most notably the introduction of ephemeral information blobs with EIP-4844, also called “protodanksharding”, which can assist scale back L2 transaction charges.

Dencun follows final yr’s Shapella improve. It’s going to first be deployed to the Goerli testnet. Then, if no main points are discovered, to Sepolia and Holesky. As soon as Dencun is operating easily on all three testnets, mainnet activation shall be scheduled.

Dencun shall be Goerli’s final improve. After it has been activated on mainnet, shopper and EF testing groups will cease supporting the Goerli testnet. For extra particulars, see this earlier announcement.

Improve Specification

The Dencun improve combines modifications to each Ethereum’s consensus and execution layers. The total record of protocol modifications may be present in EIP-7569. For reference, they’re:


Full python specs for modifications affecting Ethereum’s consensus layer may be discovered within the deneb folder of the ethereum/consensus-specs repository.


The EIPs linked above comprise the complete specs for modifications affecting Ethereum’s execution layer.

Moreover, a python specification for these is being applied within the ethereum/execution-specs repository.

Lastly, Deneb requires modifications to the Engine API, used for communication between the consensus and execution layer nodes. These are specified within the cancun.md file of the ethereum/execution-apis repository.

Shopper Releases

The next shopper releases help Dencun on Goerli. Additional variations will activate help on different testnets and mainnet. As soon as these are launched, one other announcement shall be made right here.

When selecting which shopper to run, validators must be particularly conscious of the dangers of operating a majority shopper on both the execution layer (EL) or consensus layer (CL). An explainer of those dangers and their penalties may be discovered right here. An estimate of present EL and CL shopper distribution and guides for switching from one shopper to a different may be discovered right here.

Consensus Layer Goerli Releases

Word: when operating a validator, each the Consensus Layer Beacon Node and Validator Shopper should be up to date.

Execution Layer Goerli Releases

Word: whereas Reth helps Dencun, the shopper continues to be pending a full audit and is not beneficial for manufacturing use. See the Reth README for extra context.

Dencun Bug Bounty Bonus

All Dencun-related bug bounties for in-scope vulnerabilities will obtain a 2x multiplier between now and two weeks previous to when the mainnet improve is scheduled to happen. Essential bugs are actually value as much as $500,000 USD! See the bug bounty program for extra particulars.


As an Ethereum person or Ether holder, is there something I have to do?

In brief, no.

If you happen to use an change, digital pockets or {hardware} pockets you do not want to do something until you’re knowledgeable to take further steps by your change or pockets supplier.

If you happen to run your individual Ethereum node, see the following query.

As a non-staking Goerli node operator, what do I have to do?

To be suitable with the Goerli improve, replace your node to the model of your Ethereum shopper listed within the desk above.

As a Goerli staker, what do I have to do?

To be suitable with the Goerli improve, replace your node to the model of your Ethereum shopper listed within the desk above. Be certain that each your beacon node and validator shopper are up to date!

As a non-Goerli node operator or staker, what do I have to do?

Nothing for now. Additional bulletins shall be made for Dencun’s activation on Sepolia, Holesky and mainnet. You may signal as much as obtain an electronic mail alert for them right here.

Stakers who need to run by the improve course of extra instances earlier than mainnet are inspired to make use of ephemery.dev, which can quickly help Dencun.

What occurs if I’m a Goerli staker or node operator and I don’t take part within the improve?

If you’re utilizing an Ethereum shopper that isn’t up to date to the most recent model (listed above), your shopper will sync to the pre-fork blockchain as soon as the improve happens.

You may be caught on an incompatible chain following the outdated guidelines and shall be unable to ship Ether or function on the post-Dencun Ethereum community.

As an utility or tooling developer, what ought to I do?

Evaluation the EIPs included in Dencun to find out if and the way they have an effect on your mission — there are lots of new thrilling options being launched throughout each the execution and consensus layers! The one EIPs with backwards compatibility implications are EIP-6780, EIP-7044 and EIP-7514.

The place can I observe the improve occurring?

The Goerli improve shall be livestreamed right here.

Why “Dencun”?

Upgrades to the consensus layer use star names, and people to the execution layer observe Devcon metropolis names. “Dencun” is the mix of Deneb, a first-magnitude star within the Cygnus constellation, and Cancun, the placement for Devcon 3.

Unique cowl picture by Darren Lawrence, with modifications by Tomo Saito.

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