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**What type of PR is this?** Feature + Bugfix **What does this PR do? Why is it needed?** Starting at Fusaka, the beacon node can pull blobs with the `engine_getBlobsV2` API from the execution layer. This reduces by a lot the burden on the beacon node. However, the beacon node should be able to work 100% correctly without this execution layer help. This PR introduces the `--disable-get-blobs-v2` flag to simulate a 0% success rate of this engine API. This PR also fixes: - https://github.com/OffchainLabs/prysm/issues/16171 Please read commit by commit with commit messages. **How to test it:** For the `--disable-get-blobs-v2` part: Run the beacon node with the `--disable-get-blobs-v2` flag in DEBUG mode. For every block with commitments, the following log should be displayed: ``` [2025-12-19 15:36:25.49] DEBUG sync: No data column sidecars constructed from the execution client ... ``` And the following log should **never** be displayed: ``` [2026-01-05 10:19:00.55] DEBUG sync: Constructed data column sidecars from the execution client count=... ``` For the #16171 part: - No ERROR log showed in the linked issue should never be displayed. **Acknowledgements** - [x] I have read [CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md). - [x] I have included a uniquely named [changelog fragment file](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md#maintaining-changelogmd). - [x] I have added a description with sufficient context for reviewers to understand this PR. - [x] I have tested that my changes work as expected and I added a testing plan to the PR description (if applicable).
Prysm: An Ethereum Consensus Implementation Written in Go
📖 Overview
This is the core repository for Prysm, a Golang implementation of the Ethereum Consensus specification, developed by Offchain Labs.
See the Changelog for details of the latest releases and upcoming breaking changes.
🚀 Getting Started
A detailed set of installation and usage instructions as well as breakdowns of each individual component are available in the official documentation portal.
💬 Need help? Join our Discord Community for support.
🏆 Staking on Mainnet
To participate in staking, you can join the official Ethereum launchpad. The launchpad is the only recommended way to become a validator on mainnet.
🔍 Explore validator rewards/penalties:
🤝 Contributing
🔥 Branches
Prysm maintains two permanent branches:
master- This points to the latest stable release. It is ideal for most users.develop- This is used for development and contains the latest PRs. Developers should base their PRs on this branch.
🛠 Contribution Guide
Want to get involved? Check out our Contribution Guide to learn more!
📜 License
This project is licensed under the GNU General Public License v3.0.