The Altair Beacon Chain improve is able to go dwell on the Ethereum mainnet. The improve will go dwell on Epoch 74240 (Oct 27, 2021, 10:56:23 AM UTC).

shopper model

To be suitable with the Altair improve, Beacon Node Operators Certain Replace the shopper model they’re operating. In case you run a validator, you Certain Improve to proceed following the mainnet beacon chain. Failure to take action will lead to downtime penalty.

The variations listed under assist the mainnet Altair improve.

Edit: The next desk has been edited to seek advice from the newest Altair shopper launch previous to the mainnet improve. These embody safety patches and optimizations so we suggest All Improve customers to the newest model.

*Consumer releases referenced with an asterisk have been modified because the authentic announcement.

Improve for validators

Though this improve has been examined extensively in case you are a validator on the mainnet, we strongly suggest staying on-line in the course of the improve in case any unexpected points emerge.

bug bounty bonus

To carry extra consideration to the Altair improve, all bounties for vulnerabilities associated to the Altair improve have been doubled between 4 weeks from now till launch (27 November). Critical Altair bugs in each shopper and specs now value as much as $100k.

see bug bounty program for extra data.

common query

As an Ethereum consumer or Ether holder, do I have to do something?

This improve is solely for the Beacon Chain consensus mechanism and does No Affect end-user accounts, contracts and standing secured by the Proof-of-Work chain.

In case you run your personal Beacon node, you’ll need to improve your node. Beneath “As a non-verifier beacon node operator, what do I have to do?” See part.

As a non-verifier beacon node operator, what do I have to do?

Obtain the newest model of your Beacon node shopper, as listed within the desk above.

As a Verifier, what do I have to do?

Obtain the newest model of the software program you are operating, as listed within the desk above. Comply with any directions within the launch and restart your node along with your customary restart process.

Notice, node software program supporting impartial validator shoppers would require an improve and restart for this element as properly. Please learn the warnings and directions included within the official launch.

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

If you’re utilizing a Beacon node shopper that has not up to date to the newest model (listed above), your shopper will likely be synced to the pre-fork Beacon chain after the improve. You can be caught in an inconsistent chain following the outdated guidelines.

In case you run a validator, the validator will likely be unable to take part in superior consensus and can proceed to function on the Beacon Chain community after the improve. It will lead to fines being imposed with respect to the upgraded mainnet chain.

What occurs throughout a Beacon Chain community improve?

After the Ethereum group has reached settlement on which adjustments needs to be included within the improve, adjustments to the protocol are written to varied shoppers. Beacon chain protocol adjustments are activated at a particular epoch quantity. Any node that has not been upgraded to the brand new rule-set will likely be left on the outdated chain the place the earlier ruleset might live on.

Why “Altair”?

Afterwards group dialogue and emoji voting, the shopper groups determined to make use of star names for every improve the place the order of the improve names is in alphabetical order.

Altair begins with “A”, is the twelfth brightest star within the night time sky, rotates pretty quickly with an equatorial velocity of 286 km/s, and is the situation of forbidden planet, Fairly cool star in the event you ask us.


Many because of all of the researchers, engineers and group members who’ve put in an unimaginable quantity of labor on this primary Beacon Chain community improve.

Now, onward to the merge 🚀


It’s an rising and growing excessive tech area. In case you select to implement the suggestions on this publish and proceed to take part, it’s best to be sure to perceive how this impacts you. It’s best to perceive that there are dangers concerned, together with however not restricted to dangers corresponding to surprising bugs. By selecting to implement these suggestions, you alone bear the dangers of the implications. This publish and suggestions will not be a sale of any sort, and don’t create any guarantee of any sort, together with however not restricted to something associated to the Ethereum community, or the Ethereum shoppers talked about herein.

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