FuelLabs/fuel-core

Verify prev block root in the executor and not only in the importer

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#2,961 opened on Apr 21, 2025

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 (1 comment) (0 reactions) (0 assignees)Rust (57,084 stars) (2,861 forks)batch import
good first issuetech-debt

Description

https://github.com/FuelLabs/fuel-core/blob/926b50bcb70ecf3f5ba6acc984a01d4be16bb1c4/crates/services/consensus_module/src/block_verifier.rs#L52-L73

defines the verify_block_fields function that is ran whenever a block is imported by a validator/node. We want to include this verification in the executor as well.

Contributor guide

Tech stack
rust
Domain
backendblockchain
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Rust programmingBlock verification concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Locate the verify block fields function in crates/services/consensus module/src/block verifier.rs. Understand how it is currently called during block import. Then, find the executor's block processing path and add a call to verify block fields there, ensuring it runs before or during execution. Check for any existing tests and consider adding a test for the verification in the executor. Refer to the file linked in the issue for the current implementation.
Verify prev block root in the executor and not only in the importer · FuelLabs/fuel-core#2961 | Good First Issue