Fusaka Devnet 2 was officially launched on June 26, 2025, marking a major milestone in Ethereum’s ongoing journey toward scalable data availability. The launch occurred at 10 AM UTC, and it initiates a critical testing phase for one of the most significant protocol upgrades since Dencun.
What we can Expect?
The network will incrementally adjust its blob count across epochs, following a planned cycle of increasing, decreasing, and increasing again, with a target of reaching 20 blobs per block. This staged approach simulates real-world traffic conditions and ensures that Ethereum’s consensus clients can handle fluctuating load patterns without stability risks.
Initial reports confirm that the network is performing stably post launch. However, some bugs have been observed in the Nimbus client and the occasional production of empty blocks. The Nimbus team is actively investigating these issues.
All other client teams reported successful performance with no critical faults, indicating broad readiness for this phase of testing. To streamline testing and iteration, the development teams have enabled Watchtower automation for Devnet 2.
This tool continuously monitors branch updates and triggers Docker builds every two minutes, automatically pulling new client versions into the test environment. While this enables rapid experimentation, developers were cautioned to avoid pushing untested commits, as unstable images can take clients offline.
Conclusion
If successful, it will pave the way for Devnet 3, expected to launch within two weeks, which will act as the final proving ground before mainnet readiness.
Importantly, the success of Devnet 2 may also trigger a consensus layer spec freeze, locking in critical changes and signaling that Fusaka is nearing completion from the protocol perspective. Execution layer specifications are still being finalized and will be addressed in the next All Core Devs call.
If you find any issues in this blog or notice any missing information, please feel free to reach out at yash@etherworld.co for clarifications or updates.
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