The Ethereum protocol support team published a blog post, announcing that Klin testnet is in the process of launching. Kiln is supposed to be the last merge testnet of Ethereum to switch to the Proof of Stake consensus model.
The blog post explains that similar to the Ethereum mainnet, the execution layer of Kiln initially went live under Proof-of-Work along with the Beacon Chain running Proof-of-Stake.
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The Ethereum Team Announced the Kiln Merge Testnet