Ethereum's Path to Their Own Merge: Sepolia POI Chain Merges with POA Chain

On Wednesday, the Sepolia proof-of-work chain merged with its proof-of-stake chain, bringing Ethereum that much closer to their own Merge.

The last test environment network (testnet) merger before Ethereum makes its long-awaited switch from proof-of-work to proof-of-stake has been successfully completed.

  • Sepolia was the second of three public testnets to be run through the Merge. Goerli is expected to be next.
  • The network switched to proof-of-stake (PoS) when the Terminal Total Difficulty (TTD) reached 17,000,000,000,000,000. This happened at around 17:00 UTC.
  • To the best of our knowledge, no serious problems have occurred since the testnet was merged into mainnet.
  • The Sepolia merge was a two-step process. Ethereum said that first, the operators needed to update their consensus layer and execution layer clients. Then, this caused two phases: phase one at an epoch height on the Beacon Chain and phase two when hitting the total difficulty value on the execution layer.
  • The testnet merge brings the project closer to Ethereum's mainnet upgrade, which is expected later this year. The first testnet merge, Ropsten, took place on June 8.