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## Overview Adds a path for finalizing L2 blocks, based off of the L1 block they were derived from. To accomplish this: 1. The derivation pipeline now attaches the L1 block that the L2 block was derived from, within `OpAttributesWithParent`. 2. The DA watcher actor now watches a stream of finalized L1 blocks, polled every 1m. 3. The engine actor now holds onto a map of `l1_block_number => highest_l2_block_in_epoch`, saturated when it receives attributes from the derivation actor. - When a new finalized L1 block is observed by the engine actor, it will find the highest L2 block whose batch data is contained within the finalized L1 chain, and finalize it (if it knows of any.) This approach is different than suggested by the tickets, but results in a more slim outcome that takes advantage of existing actors. ### Periphery changes - Some refactoring of the `OpAttributesWithParent` type. - The sync start algorithm now stops safe block traversal at the finalized head, to ensure it never assigns a safe block past it. - The `L1WatcherRpc` now uses a custom `BlockStream`, since alloy's `watch_blocks` stream doesn't dedup nor allow for observing anything other than head block updates. ### Result Finalized blocks are correctly streaming in 😄 <img width="1228" alt="Screenshot 2025-05-24 at 5 09 01 PM" src="https://github.com/user-attachments/assets/609184a5-35b8-4b04-a124-eeece8ef53e4" /> ### Meta closes #1693 closes #1694 closes #1695 closes #1696 closes #1698
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Trigger releases