Arrow Glacier Upgrade Announcement | Ethereum Foundation Blog

The Ethereum network will be in Block number 13,773,000, Which is expected to occur at Wednesday, December 8, 2021. Due to the different block time and time zone, the exact date may change. Please upgrade your node before Wednesday, December 5, 2021 to take into account the variable block time.

What is Arrow Glacier?

Arrow Glacier network upgrade, similar to Muir Glacier, Change the parameters of the Ice Age/Difficulty Bomb and postpone it for several months. This has also been done in the network upgrades of Byzantium, Constantinople and London. Arrow Glacier did not introduce other changes.

The difficulty bomb only affects the proof-of-work network, so it only exists on the Ethereum mainnet and the Ropsten test network.along with Recent progress In order to transition to Ethereum to Proof of Stake, it was decided to temporarily delay the bomb on the main network and try to run the Proof of Stake conversion on Ropsten before the bomb on the network exploded.

To learn more about the history of Arrow Glacier and difficulty bombs, see Ethereum Cat Shepherd’s Explainer’s blog post.

Client version

In order to be compatible with Arrow Glacier upgrades, node operators need to update the client version they are running to one of the versions listed below:

Note: OpenEthereum, Deprecated announced earlier this year, Released support for Arrow Glacier 3.3.0-rc.14, which can be downloaded here.

For now, we still recommend following the previous deprecation warning and choosing to replace the client software. If you choose to use OE for the Arrow Glacir upgrade, please proceed with caution and independently review changes to the code base before running in production.

Upgrade specification and EIP

The complete specification of the upgrade can be found in execution-specs Repository here.

A single EIP is included in the upgrade: EIP-4345: Difficulty bomb delayed to June 2022.

As an Ethereum user or Ethereum holder, what do I need to do?

If you use an exchange (such as Coinbase, Kraken, or Binance), web wallet services (such as Metamask, MyCrypto, or MyEtherWallet), mobile wallet services (such as Coinbase Wallet,, or Trust Wallet), or hardware wallets (such as Ledger, Trezor) Or KeepKey), unless the exchange or wallet service informs you to take other steps, you don’t need to take any action.

As a node operator or miner, what do I need to do?

Download the latest version of the Ethereum client, as listed in the table above.

What if I am a miner or node operator and do not participate in the upgrade?

If the Ethereum client you are using is not updated to the latest version (as listed above), once the upgrade occurs, your client will be synchronized to the pre-fork blockchain. According to the old rules, you will be stuck on an incompatible chain, and you will not be able to send Ether or operate on the upgraded Ethereum network.

What is the network upgrade of Ethereum Land?

The network upgrade is a change to the underlying Ethereum protocol, creating new rules to improve the system. The decentralized nature of the blockchain system makes network upgrades more difficult. The network upgrade in the blockchain requires cooperation and communication with the community and various Ethereum client developers to ensure a smooth transition.

What happens during the network upgrade?

After the community agrees on what changes should be included in the upgrade, the changes to the agreement will be written to various Ethereum clients, such as geth, Erigon, Besu, and Nethermind. The protocol change is activated at a specific block number. Any node that has not been upgraded to the new rule set will be discarded on the old chain, while the previous rules still exist.

Why is it called “Arrow Glacier”?

Although we have been using the Devcon name for network upgrades recently, when our previous upgrade could only push back the bomb, we decided to switch the nomenclature. To highlight the nature of the upgrade (postponing the “Ice Age”), we used a glacier name, Muir Glacier.

This upgrade follows a similar pattern. Since the transition to proof of rights is coming, I chose the retreating glacier, so I chose Arrow Glacier🏔!

Thank you!

Thank you very much to the Ethereum community and all the customers and all the Ethereum developers on the platform, who gathered together to provide opinions, ideas and contributions. This may be the last network upgrade of Ethereum before transitioning to Proof of Stake. let’s go!

Also, thank you very much Hashir Gudka For the cover image.

This is an emerging and constantly evolving highly technical field. If you choose to implement the recommendations in this article and continue to participate, you should make sure you understand how it affects you. You should understand the risks involved, including but not limited to accidental errors and other risks. By choosing to implement these recommendations, you will alone risk the consequences. This article and recommendation are not any form of sales, nor does it constitute any form of guarantee, including but not limited to anything related to the Ethereum network or the Ethereum customers mentioned here.

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