Mainnet Merge Announcement | Ethereum Foundation Blog

• Ethereum is transferring to proof-of-stake! The transition, generally known as The Merge, should first be activated on the Beacon Chain with the Bellatrix improve. After this, the proof-of-work chain will migrate to proof-of-stake upon hitting a selected Complete Issue worth.
• The Bellatrix improve is scheduled for epoch 144896 on the Beacon Chain — 11:34:47am UTC on Sept 6, 2022.
• The Terminal Complete Issue worth triggering The Merge is 58750000000000000000000, anticipated between Sept 10-20, 2022.
• Notice: as announced earlier, the Kiln testnet is being sundown. Operators will shut down on September 6, 2022.

Background

Following years of laborious work, Ethereum’s proof-of-stake improve is lastly right here! The profitable improve of all public testnets is now full, and The Merge has been scheduled for the Ethereum mainnet.

The Merge is completely different from earlier community upgrades in two methods. First, node operators have to replace each their consensus layer (CL) and execution layer (EL) purchasers in tandem, fairly than simply one of many two. Second, the improve prompts in two phases: the primary, named Bellatrix, at an epoch top on the Beacon Chain, and the second, named Paris, upon hitting a Total Difficulty worth on the execution layer.

Improve Data

Timing

The Merge is a two-step course of. Step one is a community improve, Bellatrix, on the consensus layer triggered by an epoch top. That is adopted by the execution layer’s transition from proof-of-work to proof-of-stake, Paris, triggered by a selected Complete Issue threshold known as the Terminal Complete Issue (TTD).

The Bellatrix improve is scheduled for epoch 144896 on the Beacon Chain — 11:34:47am UTC on Sept 6, 2022.

Paris, the execution layer’s portion of the transition, will probably be triggered by the Terminal Complete Issue (TTD) of 58750000000000000000000, anticipated between Sept 10-20, 2022. The precise date at which TTD is reached relies upon proof-of-work hash fee. Estimates for the transition will be discovered at bordel.wtf and 797.io/themerge.

As soon as the execution layer reaches or exceeds the TTD, the next block will probably be produced by a Beacon Chain validator. The Merge transition is taken into account full as soon as the Beacon Chain finalizes this block. Underneath regular community situations, this may occur 2 epochs (or ~13 minutes) after the primary post-TTD block is produced!

A brand new JSON-RPC block tag, finalized, returns the most recent finalized block or an error if no such post-merge block exists. This tag can be utilized by purposes to test if The Merge has been accomplished. Equally, sensible contracts can query the DIFFICULTY opcode (0x44) (renamed to PREVRANDAO post-merge) to find out if The Merge has occurred. We suggest infrastructure suppliers monitor total community stability along with finalization standing.

Shopper Releases

The next shopper releases help The Merge on the Ethereum mainnet. Node operators should run each an execution and consensus layer shopper to stay on the community throughout and after The Merge.

When selecting which shopper to run, validators needs to be particularly conscious of the dangers of working a majority shopper on each the EL and CL. An explainer of those dangers and their penalties will be discovered here. An estimate of present EL and CL shopper distribution and guides for switching from one shopper to a different will be discovered here.

Consensus Layer

Warning: Nimbus model v22.9.0 is a high-urgency improve that fixes a essential pre-TTD block manufacturing problem affecting customers that restarted their node after Bellatrix. It additionally improves compatibility with Besu, Prysm and sluggish block builders and gives a pace enhance in block processing essential for these working on Raspberry Pi and related {hardware}.

Warning: Lighthouse model v3.1.0 is a high-priority launch incorporates an essential repair to make sure that Lighthouse doesn’t try to supply invalid blocks. The –strict-fee-recipient flag for the Lighthouse Validator Shopper has additionally been discovered to forestall block proposals within the interval between the Bellatrix improve (Sept sixth) and the TTD date (estimated Sept fifteenth). We’re presently inside that time frame and subsequently all stakers utilizing that flag are affected. We advise that anybody utilizing the –strict-fee-recipient flag ought to take away it and restart the Validator Shopper as quickly as attainable. This doesn’t have an effect on the –suggested-fee-recipient flag.

Warning: Prysm v3.1.1 is a extremely really useful replace because it incorporates a number of essential fixes and options for the merge.

Warning: Teku model 22.9.0 is a required replace.

Execution Layer

Warning: Besu 22.7.2 is a really useful launch for the Merge and Mainnet customers. 22.7.1 stays Merge-ready. This launch gives further robustness earlier than the Merge with some fixes and enhancements in sync, peering, and logging.

Warning: Erigon model v2022.09.01-alpha fixes invalid block manufacturing because of inadequate verification of digital signature elements, block snapshot manufacturing that typically happens throughout POS reverse header obtain and quite a lot of smaller bugs and issues of safety. All Erigon customers are really useful to improve to this or a later model previous to the Merge.

Warning: geth model v1.10.22 incorporates a essential database problem, don’t use this model, and in case you have already upgraded, please improve to v1.10.23 as quickly as attainable.

Improve Specs

Consensus-critical modifications for The Merge are laid out in two locations:

• The consensus layer modifications beneath the Bellatrix directory of the consensus-specs repository
• The execution layer modifications beneath the Paris spec within the execution-specs repository

Along with these, two different specs cowl how the consensus and execution layer purchasers work together:

• The Engine API, specified within the execution-apis repository, is used for communication between the consensus and execution layers
• Optimistic Sync, specified within the sync folder of the consensus-specs repository, is utilized by the consensus layer to import blocks because the execution layer shopper is syncing and to supply a partial view of the top of the chain from the previous to the latter

Merge Bug Bounty Bonus

All Merge-related bounties for vulnerabilities have obtained a 4x multiplier between now and the eighth of September. Crucial bugs are actually price as much as $1 million USD.

See the bug bounty program for extra particulars.

FAQ

As a node operator, what ought to I do?

Publish-merge, an Ethereum full node is the mixture of a consensus layer (CL) shopper which runs the proof-of-stake Beacon Chain and an execution layer (EL) shopper which manages the user-state and runs the computations related to transactions. The EL and CL shopper talk over an authenticated port utilizing a brand new set of JSON RPC strategies known as the Engine API. The EL and CL shopper authenticate one another utilizing a JWT secret. Node operators ought to check with their purchasers’ documentation for directions about find out how to generate and configure this worth.

In different phrases, in case you had been already working a node on the Beacon Chain, you now additionally have to run an execution layer shopper. Equally, in case you had been working a node on the present proof-of-work community, you have to to run a consensus layer shopper. For them to speak securely, a JWT token have to be handed to every shopper. An replace to the ‘Run a Node’ section of the ethereum.org web site goes over these steps in additional element.

It’s price emphasizing that whereas they’re each a part of consensus layer shopper releases, working a Beacon Node is distinct from working a Validator Shopper. Stakers should run each, however node operators solely want the previous. This post explains the distinction between each elements in additional element.

Additionally, be aware that every layer will keep an unbiased set of friends and expose its personal APIs. The Beacon and JSON RPC APIs will each proceed working as anticipated.

As a staker, what do I have to do?

As defined above, validators on the Beacon Chain might want to run an execution layer shopper after The Merge along with their consensus layer purchasers. Pre-merge, this was strongly really useful, however some validators have outsourced these capabilities to third-party suppliers. This was attainable as a result of the one knowledge required on the execution layer had been updates to the deposit contract.

Publish-merge, validators should be certain that consumer transactions and state transitions blocks that they create and attest to are legitimate. To do that, every beacon node have to be paired with an execution layer shopper. Notice that a number of validators can nonetheless be paired to a single beacon node & execution layer shopper combo. This expands validators’ tasks but in addition offers a validator who proposes a block the suitable to its related transaction precedence charges (which presently go to miners).

Whereas validator rewards nonetheless accrue on the Beacon Chain and would require a subsequent community improve to be withdrawn, transaction charges will probably be paid, burned, and distributed on the execution layer. Validators can specify any Ethereum tackle as a recipient for transaction charges.

After updating your consensus shopper, you’ll want to set the payment recipient as a part of your validator shopper configurations to make sure transaction charges are despatched to an tackle you management. In case you have staked utilizing a third-party supplier, it’s as much as your chosen supplier to specify how these charges are allotted.

The Staking Launchpad has a Merge Readiness Checklist that stakers can use to make sure they’ve gone by every step of the method. EthStaker have additionally hosted Validator Prep Workshops, with extra being deliberate.

Stakers who want to run a validator on a testnet in preparation for the mainnet proof-of-stake transition can accomplish that on Goerli (now merged with Prater), which additionally has a Staking Launchpad instance.

Why is the estimated date for the Terminal Complete Issue so broad?

The incremental problem added per block relies on the community hash fee which is risky. If extra hash fee joins the community, TTD will probably be reached sooner. Equally, if hash fee leaves the community, TTD will probably be reached later. Within the occasion of a big drop in hash fee ranges, a TTD Override might be coordinated as was executed on Ropsten.

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

As defined in a previous post, The Merge could have solely minimal impression on a subset of contracts deployed on Ethereum, none of which needs to be breaking. Moreover, the lion’s share of consumer API endpoints stay steady (until you utilize proof-of-work particular strategies akin to eth_getWork).

That mentioned, most purposes on Ethereum contain far more than on-chain contracts. Now could be the time to make sure that your front-end code, tooling, deployment pipeline and different off-chain elements work as supposed. We strongly suggest that builders run by an entire testing & deployment cycle on Sepolia or Goerli and report any points with instruments or dependencies to these tasks’ maintainers. If you’re not sure the place to open a difficulty, please use this repository.

Moreover, please be aware that every one testnets apart from Sepolia and Goerli will probably be deprecated post-merge. If you’re a consumer of Ropsten, Rinkeby or Kiln, it is best to plan emigrate to Goerli or Sepolia. Extra details about this may be discovered here.

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

Whether or not you’re utilizing Ethereum purposes on-chain, holding Ether on an alternate or in a self-custodied pockets, you would not have to do something. If an software, alternate or pockets you utilize presents additonal directions or suggestions, it is best to confirm these are literally coming from them. Be looking out for scams!

As a miner, is there something I have to do?

No. If you’re mining on the Ethereum mainnet, you need to be conscious that the community will function totally beneath proof-of-stake after The Merge. At that time, mining will not be attainable on the community.

What occurs if I’m a miner 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 most recent model (listed above), your shopper will sync to the pre-fork blockchain as soon as the improve happens.

You may be caught on an incompatible chain following the previous guidelines and will probably be unable to ship Ether or function on the post-merge Ethereum community.

As a validator, can I withdraw my stake?

No. The Merge is essentially the most sophisticated improve to Ethereum so far. To attenuate dangers of community disruptions, a minimal strategy was taken which excluded any non-transition modifications from this improve.

Withdrawals from the Beacon Chain will doubtless be launched within the first improve after The Merge. Specs for each the consensus and execution layers are in progress.

I’ve extra questions, the place can I ask them?

Be part of shopper staff builders, members of ETHStaker, researchers, and extra on the following Merge Community Call on Friday, Sept 9 at 14:00 UTC!

Thank You

Ethereum’s transition to proof-of-stake has been a loooong time coming. Thanks to everybody who contributed to researching, specifying, creating, analyzing, testing, breaking, fixing, or explaining every thing that received us to The Merge.

There have been far too many contributors over time to listing right here, however you recognize who you’re. With out all of you within the bazaar, we would not have constructed this cathedral.

wen merge? Very 🔜.

Thanks to Joseph Schweitzer and Tomo Saito for the duvet picture for this put up!