Ethereum's Sepolia Testnet Successfully Switches to Proof-of-Stake

The Sepolia proof-of-work chain merged with its proof-of-stake chain on Wednesday, taking Ethereum one step closer to its own Merge moment.

AccessTimeIconJul 6, 2022 at 5:24 p.m. UTC
Updated Apr 9, 2024 at 11:11 p.m. UTC
Layer 2

The penultimate test environment network (testnet) merge before the Ethereum blockchain makes its long-awaited move to proof-of-stake from proof-of-work has successfully been completed.

  • Sepolia was the second of three public testnets to run through the Merge. After this, Goerli is expected to merge.
  • The network went to proof-of-stake (PoS) when the Terminal Total Difficulty (TTD) exceeded 17,000,000,000,000,000. That occurred around 17:00 UTC.
  • In the hours since the testnet merge happened, no significant glitches have been reported.
  • The Sepolia merge was a two-step process. Ethereum announced that first the operators needed to update their consensus layer and execution layer clients together. That then activated two phases: the first at an epoch height on the Beacon Chain and the second upon hitting the total difficulty value on the execution layer.
  • The testnet merge takes the project one step closer to Ethereum's mainnet upgrade later this year. The first testnet merge, Ropsten, was completed on June 8.


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Margaux Nijkerk

Margaux Nijkerk reports on the Ethereum protocol and L2s. A graduate of Johns Hopkins and Emory universities, she has a masters in International Affairs & Economics. She holds a small amount of ETH and other altcoins.