Mainnet Merge Announcement | Ethereum Basis Weblog


  • Ethereum is transferring to proof-of-stake! The transition, referred to 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 particular Whole Problem worth.
  • The Bellatrix improve is scheduled for epoch 144896 on the Beacon Chain — 11:34:47am UTC on Sept 6, 2022.
  • The Terminal Whole Problem worth triggering The Merge is 58750000000000000000000, anticipated between Sept 10-20, 2022.
  • Notice: as introduced earlier, the Kiln testnet is being sundown. Operators will shut down on September 6, 2022.


Following years of arduous 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 must replace each their consensus layer (CL) and execution layer (EL) shoppers in tandem, quite 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 Whole Problem worth on the execution layer.

Improve Data


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 particular Whole Problem threshold known as the Terminal Whole Problem (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, can be triggered by the Terminal Whole Problem (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 may be discovered at and

As soon as the execution layer reaches or exceeds the TTD, the next block can be produced by a Beacon Chain validator. The Merge transition is taken into account full as soon as the Beacon Chain finalizes this block. Beneath regular community circumstances, 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 newest finalized block or an error if no such post-merge block exists. This tag can be utilized by functions to test if The Merge has been accomplished. Equally, good contracts can question 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 assist 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 operating a majority shopper on each the EL and CL. An explainer of those dangers and their penalties may be discovered right here. An estimate of present EL and CL shopper distribution and guides for switching from one shopper to a different may be discovered right here.

Consensus Layer

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

Warning: Lighthouse model v3.1.0 is a high-priority launch accommodates an vital 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 stop 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 doable. 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 accommodates a number of vital 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 resulting from 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 accommodates a essential database challenge, don’t use this model, and when you have already upgraded, please improve to v1.10.23 as quickly as doable.

Improve Specs

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

  • The consensus layer adjustments beneath the Bellatrix listing of the consensus-specs repository
  • The execution layer adjustments beneath the Paris spec within the execution-specs repository

Along with these, two different specs cowl how the consensus and execution layer shoppers 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 acquired a 4x multiplier between now and the eighth of September. Vital bugs at the moment are value as much as $1 million USD.

See the bug bounty program for extra particulars.


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 seek advice from their shoppers’ documentation for directions about the right way to generate and configure this worth.

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

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

Additionally, be aware that every layer will keep an impartial 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 must 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 shoppers. Pre-merge, this was strongly really useful, however some validators have outsourced these capabilities to third-party suppliers. This was doable as a result of the one information required on the execution layer have been updates to the deposit contract.

Publish-merge, validators should make sure that person transactions and state transitions blocks that they create and attest to are legitimate. To do that, every beacon node should 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’ duties but additionally offers a validator who proposes a block the correct 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 can be paid, burned, and distributed on the execution layer. Validators can specify any Ethereum deal with as a recipient for transaction charges.

After updating your consensus shopper, be sure you set the price recipient as a part of your validator shopper configurations to make sure transaction charges are despatched to an deal with you management. You probably 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 Guidelines that stakers can use to make sure they’ve gone by means of 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 occasion.

Why is the estimated date for the Terminal Whole Problem so broad?

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

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

As defined in a earlier put up, 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 person API endpoints stay steady (except you employ proof-of-work particular strategies equivalent to eth_getWork).

That stated, most functions 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 means of an entire testing & deployment cycle on Sepolia or Goerli and report any points with instruments or dependencies to these initiatives’ maintainers. In case you are not sure the place to open a difficulty, please use this repository.

Moreover, please be aware that each one testnets except for Sepolia and Goerli can be deprecated post-merge. In case you are a person of Ropsten, Rinkeby or Kiln, it’s best to plan emigrate to Goerli or Sepolia. Extra details about this may be discovered right here.

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

Whether or not you might be utilizing Ethereum functions on-chain, holding Ether on an trade or in a self-custodied pockets, you shouldn’t have to do something. If an software, trade or pockets you employ provides additonal directions or suggestions, it’s best to confirm these are literally coming from them. Be looking out for scams!

As a miner, is there something I must do?

No. In case you are mining on the Ethereum mainnet, try to be conscious that the community will function completely beneath proof-of-stake after The Merge. At that time, mining will not be doable on the community.

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

In case you are utilizing an Ethereum shopper that isn’t up to date to the newest model (listed above), your shopper 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 can 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 difficult improve to Ethereum to this point. To reduce dangers of community disruptions, a minimal method was taken which excluded any non-transition adjustments from this improve.

Withdrawals from the Beacon Chain will seemingly 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 crew builders, members of ETHStaker, researchers, and extra on the subsequent Merge Group Name 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, growing, analyzing, testing, breaking, fixing, or explaining every little thing that obtained us to The Merge.

There have been far too many contributors over time to record right here, however who you might be. 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 quilt picture for this put up!


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