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    Ethereum PoS testnet Kiln initiated, merged and cease

    Only two days after its launch, the Ethereum merge Kiln testnet has now transitioned from running proof-of-work consensus mechanism, to running proof-of-stake. This successful merge is considered the last major step before the merge of the Ethereum mainnet.

    When merge? This question is being asked with increased frequency and intensity as the developers of the Ethereum clients and testnets are getting closer to The Merge by the day. To this point, the testnet Kiln was launched just two days ago, and developers have now successfully completed a transition from the proof-of-work consensus mechanism to the looming proof-of-work mechanism that the real Ethereum mainnet will merge to sometime this year.

    The merge of what is now called the old execution chain and the new consensus chain really took off over two years ago with the successful launch of the so-called beacon chain in December 2020. Since then, Ethereum developers have run a number of tests on various testnets to test the transition process and other important technical systems.

    Kiln replaced the Kintsugi testnet

    The Kintsugi merge testnet, launched late December, has been a valuable testing ground for The Merge, according to a blog post by the Ethereum Foundation, EF. Through various test suites, multi-client devnets, shadow forks of the proof-of-work testnet Goerli, application deployments, and the community’s help, clients have implemented these latest specs and developers have arrived at a set of stable and robust protocol specifications.

    Only two days ago, the Kintsugi testnet was replaced with the launch of the Kiln testnet. Like the Ethereum (ETH) mainnet, Kiln’s execution layer was launched under proof-of-work in parallel to the beacon chain running proof-of-stake. These two chains have now successfully merged by letting the beacon chain take over the transaction validation functionalities performed by the Kiln network up to the point of the merge.

    As per EF’s blog post, Kiln is expected to be the last merge testnet created before existing public testnets are upgraded. Application and tooling developers, node operators, infrastructure providers and stakers are strongly encouraged to test on Kiln to ensure a smooth transition on existing public testnets.

    The merge process will be tested several times

    According to Prysm Ethereum client developer Marius van der Wijden, developers will perform a lot of shadow forking to repeatedly run the merge process several times to make sure the merge transition process itself runs smoothly. Van der Wijden says.

    “It’s a great way to test the performance and the transition on mainnet,”

    Initially, van der Wijden’s team ran into some hiccups with the Prysm client.

    The merge of the Kiln testnet and the beacon chain is widely considered to be the last major test before the actual merge of the real Ethereum network with the beacon chain. Kintsugi, the previous merge testnet, will be deprecated in the coming weeks.

    By the completion of the Kiln merge, the process of merging the Ethereum mainnet is on track and is expected to happen in the coming months. The exact time of the merge is still not set as there remains some testing to do on the merged Kiln testnet to assure clients are working as expected.

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