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Thursday, February 29, 2024

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 nicely, Dencun might 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 occasions:

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

Dencun follows final yr’s Shapella improve. It would first be deployed to Ethereum testnets. As soon as these all are easily working the improve, Dencun might 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 might be present in EIP-7569. For reference, they’re:


Full python specs for modifications affecting Ethereum’s consensus layer might 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 carried out 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 consumer releases assist Dencun on each Sepolia and Holesky. Additional variations will activate assist on mainnet. As soon as these are launched, one other announcement might be made on this weblog.

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

Consensus Layer Sepolia & Holesky Releases

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

Execution Layer Sepolia & Holesky Releases

Observe: whereas Reth helps Dencun, the consumer continues to be pending a full audit and is not really useful for manufacturing use. See the Reth README for extra context.


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

Briefly, no.

In case you use an trade, digital pockets or {hardware} pockets you do not want to do something except you might be knowledgeable to take extra steps by your trade or pockets supplier.

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

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

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

As a Sepolia or Holesky staker, what do I must do?

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

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

Nothing for now. Additional bulletins might be made for Dencun’s activation on mainnet. You possibly can signal as much as obtain an e-mail alert for them right here.

Stakers who wish to run by means of the improve course of extra occasions earlier than mainnet are inspired to make use of ephemery.dev, 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?

In case you are utilizing an Ethereum consumer that isn’t up to date to the newest model (listed above), your consumer will sync to the pre-fork blockchain as soon as the improve happens.

You can be caught on an incompatible chain following the previous guidelines and might 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 venture — 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 observe 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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