Altair Mainnet Announcement | Ethereum Foundation Blog

The Altair beacon chain improve is able to be activated on the Ethereum mainnet. The improve will go stay at epoch 74240 (Oct 27, 2021, 10:56:23am UTC).

Client Versions

In order to be appropriate with the Altair improve, beacon node operators should replace the shopper model that they run. If you run a validator, you should improve to proceed to observe the mainnet beacon chain. Failure to take action will end in downtime penalties.

The variations listed beneath are assist the mainnet Altair improve.

Upgrade for Validators

Although this improve has been extensively examined if you’re a validator on Mainnet, we strongly advocate being on-line through the time of the improve within the occasion that any unforseen points emerge.

Bug Bounty Bonus

In order to get extra eyes on the Altair improve, all bounties for vulnerabilities associated to the Altair improve have been doubled between now and 4 weeks after the launch (Nov 27). Critical Altair bugs in each purchasers and specs are actually value as much as $100k.

See the bug bounty program for extra particulars.


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

This improve is solely for the beacon chain consensus mechanism and does not have an effect on end-user accounts, contracts, and state secured by the proof-of-work chain.

If you run your individual beacon node, it’s worthwhile to improve your node. See the “As a non-validator beacon node operator, what do I need to do?”” part beneath.

As a non-validator beacon node operator, what do I must do?

Download the newest model of your beacon node shopper, as listed within the desk above.

As a validator, what do I must do?

Download the newest model of the software program you run, as listed within the desk above. Follow any directions within the launch and restart your node together with your normal restart process.

Note, node software program that helps impartial validator purchasers would require an improve and restart to this part as nicely. Please learn warnings and directions contained within the official releases.

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

If you might be utilizing a beacon node shopper that’s not up to date to the newest model (listed above), your shopper will sync to the pre-fork beacon chain as soon as the improve happens. You shall be caught on an incompatible chain following the outdated guidelines.

If you run a validator, the validator shall be unable to take part within the upgraded consensus and can proceed to function on the post-upgrade beacon chain community. This will end in penalties with respect to the upgraded Mainnet chain.

What occurs throughout a beacon chain community improve?

After the Ethereum neighborhood involves an settlement regarding which modifications ought to be included within the improve, modifications to the protocol are written into the assorted purchasers. The beacon chain protocol modifications are activated at a selected epoch quantity. Any nodes that haven’t been upgraded to the brand new ruleset shall be deserted on the outdated chain the place the earlier guidelines could live on.

Why “Altair”?

After neighborhood dialogue and emoji voting, shopper groups determined to make use of star names for every improve the place the sequence of improve names are in alphabetical order.

Altair begins with a “A”, is the twelfth brightest star within the night time sky, rotates fairly quickly with an equatorial velocity of 286 km/s, and is the placement of the Forbidden Planet. Pretty cool star when you ask us.

Thank you!

Huge shoutout to the entire researchers, engineers, and neighborhood members which have put an unimaginable quantity of labor into this primary beacon chain community improve.

Now, onward to the Merge 🚀


This is an emergent and evolving extremely technical area. If you select to implement the suggestions on this submit and proceed to take part, it’s best to ensure you perceive the way it impacts you. You ought to perceive that there are dangers concerned together with however not restricted to dangers like surprising bugs. By selecting to implement these suggestions, you alone assume the dangers of the implications. This submit and suggestions will not be a sale of any type, and don’t create any warranties of any type together with however not restricted to something associated to the Ethereum community, or the Ethereum purchasers referred to herein.

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