Immutable Chain plans to migrate to the OP Stack in mid-2027, cutting its block time to 1 second.
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According to official announcements, Immutable plans to upgrade its Immutable Chain from a Geth-based custom fork to an OP Stack-based blockchain by mid-2027, while retaining its existing state and Chain ID. After the upgrade, all accounts, balances, smart contracts, and authorization records will remain unchanged, with no action required from users or developers in most cases. The upgrade will reduce the block time from 2 seconds to 1 second, transform Immutable Chain into an Ethereum Rollup, and enable state proof-based cross-chain bridging and Ethereum data availability. However, transaction costs will rise slightly, and native withdrawal times will extend to approximately 7 days. The migration is expected to pause block production for several hours, with a specific timeline to be announced in advance once confirmed. Immutable noted that the migration will be based on directly verified state commitments published to Ethereum, replacing the existing native bridging solution that relies on the Axelar cross-chain messaging network, and will introduce permissioned fraud proofs and zero-knowledge validity proofs in phases. Additionally, building on OP Stack will facilitate faster adoption of protocol upgrades, EVM upgrades, and security patches. Meanwhile, Immutable plans to discontinue support for game development testing on its current Immutable testnet by the end of 2026. The decision stems from the testnet’s lack of third-party integrations, which makes it difficult to meet the testing needs of complex game workflows, as most games have shifted to local or production chains for testing.
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