fix(metering): pass parent_beacon_block_root for EIP-4788 compliance #481
+103
−10
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
The `base_meterBundle` RPC was failing on Cancun-activated chains with "EIP-4788 parent beacon block root missing" because pending flashblock headers may omit the parent_beacon_block_root field. This adds explicit parameter passing from the flashblock base payload (CL-provided) to the meter_bundle function, falling back to the header value if available.
Collaborator
✅ Heimdall Review Status
|
3 tasks
danyalprout
approved these changes
Jan 15, 2026
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Summary
base_meterBundleRPC failing with "EIP-4788 parent beacon block root missing"parent_beacon_block_rootparameter tometer_bundle()functionContext
Pending flashblock headers may omit the
parent_beacon_block_rootfield, but EIP-4788 requires this value for block execution. The fix prefers the CL-provided value from the flashblock base payload when available.Test plan
meter_bundle_requires_parent_beacon_block_rootverifies behavior with and without the root