Sepolia & Holesky Dencun Announcement

  • Goerli blobs are right here: Dencun went dwell on Goerli at 6:32 UTC on January 17, 2024. Now you can use blobs there!
  • Sepolia and Holesky will improve over the following two weeks. Dencun will activate on Sepolia at epoch 132608 (January thirtieth, 22:51 UTC), and on Holesky at epoch 29696 (February seventh, 11:35 UTC).
  • Shopper releases on this announcement are appropriate for each testnet upgrades.
  • Assuming the Sepolia and Holesky upgrades go effectively, Dencun will probably be scheduled on the Ethereum mainnet subsequent.
  • To obtain an e mail alert for community improve bulletins, together with the Dencun mainnet one, subscribe right here.

The Dencun community improve has efficiently activated on the Goerli testnet on January 17, 2024. It’s now scheduled for the 2 remaining testnets, Sepolia and Holesky, on the following instances:

The improve consists of a number of modifications, most notably the introduction of ephemeral knowledge blobs with EIP-4844, also called “protodanksharding”, which can assist cut back L2 transaction charges.

Dencun follows final 12 months’s Shapella improve. It’ll first be deployed to Ethereum testnets. As soon as these all are easily operating the improve, Dencun will probably be scheduled for deployment on the Ethereum mainnet.

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 include the total 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 file of the ethereum/execution-apis repository.

Shopper Releases

The next shopper releases help Dencun on each Sepolia and Holesky. Additional variations will activate help on mainnet. As soon as these are launched, one other announcement will probably be made on this weblog.

When selecting which shopper to run, validators ought to be particularly aware 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 here. An estimate of present EL and CL shopper distribution and guides for switching from one shopper to a different may be discovered here.

Consensus Layer Sepolia & Holesky Releases

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

Execution Layer Sepolia & Holesky Releases

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


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

In brief, no.

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

When you run your individual Ethereum node, see the following query.

As a non-staking Sepolia or Holesky node operator, what do I have to do?

To be suitable with the improve on both testnet, replace your node’s execution and consensus layer shoppers to the variations listed within the desk above.

As a Sepolia or Holesky staker, what do I have to do?

To be suitable with the improve on both testnet, replace your node’s execution and consensus layer shoppers to the variations listed within the desk above. Make sure that each your beacon node and validator shopper are up to date.

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

Nothing for now. Additional bulletins will probably be made for Dencun’s activation on mainnet. You’ll be able to signal as much as obtain an e mail alert for them right here.

Stakers who need to run by means of the improve course of extra instances earlier than mainnet are inspired to make use of, which now helps Dencun.

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

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

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

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

Assessment the EIPs included in Dencun to find out if and the way they have an effect on your undertaking — there are various 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.

Why “Dencun”?

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

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

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