Ethereum’s Merge estimate moved beyond June as testing continued

Ethereum’s public roadmap showed a third- or fourth-quarter 2022 estimate for The Merge on April 13, 2022, replacing the second-quarter estimate visible in an April 2 update. The change mattered because The Merge was intended to replace proof-of-work mining with proof-of-stake consensus on Ethereum’s live network, affecting miners, validators, node operators, exchanges and infrastructure providers.

The record requires a qualification that much of the day’s coverage blurred: Ethereum developers had not formally scheduled The Merge for June. Protocol developer Tim Beiko wrote on April 12 that it would not happen in June, was likely a few months away and still had no firm date. By April 13, therefore, the verified development was a revised public estimate and clearer developer guidance—not the postponement of an officially fixed upgrade.

What changed in the roadmap

The Merge was designed to join Ethereum’s existing execution layer with the proof-of-stake Beacon Chain. EIP-3675 specified the corresponding replacement of proof-of-work consensus, including ending proof-of-work block production after the transition threshold was reached.

Coinbase Institutional’s contemporaneous review, published on April 14 and explicitly describing the roadmap as viewed on April 13, recorded the move from approximately the second quarter to the third or fourth quarter of 2022. Coinbase interpreted late in the third quarter as plausible, but labeled that conclusion as its own estimate and emphasized substantial engineering and coordination uncertainty.

Beiko’s roadmap FAQ supplied the narrower protocol position: there was no official date. Client teams first needed confidence that their implementations were thoroughly tested and free of known blocking problems. A date would follow stable testnet upgrades and would be announced through Ethereum’s official channels.

That distinction is central to this reconstruction. “Beyond June” was attributable developer guidance. A specific third-quarter launch date was not an Ethereum commitment on April 13.

Testing, not a calendar promise

Ethereum developers had run the Kiln testnet transition on March 15 and the first mainnet shadow fork on April 11. A shadow fork allowed selected nodes to process Ethereum’s existing state and transaction activity under proposed Merge rules without changing the canonical mainnet.

The April 11 exercise represented progress, but it also exposed implementation issues, including a client configuration problem involving the default gas limit. The roadmap FAQ said shadow forks against testnets and mainnet had revealed client problems that teams were correcting. Developers planned to continue shadow-fork testing before moving established public testnets—including Ropsten, Sepolia and Goerli—through their own transitions.

The revised window therefore reflected an unfinished validation sequence. It did not establish that The Merge had failed, nor did a successful shadow fork prove that every client combination, synchronization path or operational dependency was ready for mainnet.

The timing also interacted with Ethereum’s difficulty bomb, code intended to make proof-of-work blocks progressively slower. Beiko’s April 2022 FAQ anticipated that the bomb could begin affecting block times during the following months. If The Merge was not ready before the slowdown became disruptive, developers would have to consider another bomb delay. That possibility added a separate coordination decision; it did not itself determine the Merge date.

Why the April 13 update mattered

The roadmap change narrowed what institutions could responsibly assume. Miners could no longer treat June as a reliable endpoint. Validators and infrastructure operators still needed to test paired consensus- and execution-layer clients. Exchanges and application providers had to plan for an upgrade whose activation conditions and production date remained unsettled.

No cryptocurrency price or trading-volume claim is used here. The surviving evidence does not establish that the roadmap revision caused a particular ether move, and continuous trading across venues makes an unsupported event-day causal claim especially weak.

Later context

Later official records show that Ethereum completed The Merge on September 15, 2022. That outcome confirms the transition ultimately occurred within the revised broad window, but it was not knowable on April 13 and does not erase the uncertainty developers documented on that date.