---
tags:
- leanSpec
- weekly-report
- ethereum/consensus
created: "2026-05-16"
period: "2026-05-09 ~ 2026-05-16"
repo: leanEthereum/leanSpec
pr_count: 8
---

# leanSpec Weekly Report (May 9 – May 16, 2026)

> Auto-generated weekly summary of merged PRs in [leanEthereum/leanSpec](https://github.com/leanEthereum/leanSpec)

## Overview

This week's PRs focus on improving the Lean Ethereum specification by enhancing validator duties, refining block building logic, and adding new API endpoints for synchronization. Additionally, improvements have been made to the testing framework by allowing capability-based testing and hardening test fixture generation.

## Merged PRs

### Consensus

| PR | Title | Author | Merged | Changes |
|----|-------|--------|--------|---------|
| [#716](https://github.com/leanEthereum/leanSpec/pull/716) | fix: allow older-but-justified sources in `build_block` | @MegaRedHand | May 14 | +264 -29 |
| [#718](https://github.com/leanEthereum/leanSpec/pull/718) | fix(forks/lstar): harden build_block filter against crashes and duplicates | @tcoratger | May 15 | +120 -119 |
| [#708](https://github.com/leanEthereum/leanSpec/pull/708) | feat: add validator sync-lag duty gate | @shariqnaiyer | May 11 | +510 -11 |
| [#715](https://github.com/leanEthereum/leanSpec/pull/715) | feat(forks): add SigScheme capability and @requires marker (Stage 7 of #686) | @leolara | May 11 | +359 -20 |

**Summary**: These PRs refine the consensus logic related to block building and attestation processing. They introduce validator sync-lag duty gates to avoid stale votes, fix issues related to justified sources in block construction, and enhance the capability of testing different signature schemes.

### API

| PR | Title | Author | Merged | Changes |
|----|-------|--------|--------|---------|
| [#713](https://github.com/leanEthereum/leanSpec/pull/713) | feat(api,sync): add /lean/v0/blocks/finalized for checkpoint-sync anchor block | @ch4r10t33r | May 11 | +449 -13 |

**Summary**: This PR introduces a new API endpoint, `/lean/v0/blocks/finalized`, to provide the finalized signed block required for checkpoint synchronization, improving the synchronization process for nodes.

### Refactoring

| PR | Title | Author | Merged | Changes |
|----|-------|--------|--------|---------|
| [#719](https://github.com/leanEthereum/leanSpec/pull/719) | refactor(types): rename aggregation.py to participation.py | @tcoratger | May 15 | +112 -64 |

**Summary**: This PR renames `aggregation.py` to `participation.py` to better reflect its purpose within the type definitions, improving code clarity and maintainability.

### Documentation

| PR | Title | Author | Merged | Changes |
|----|-------|--------|--------|---------|
| [#720](https://github.com/leanEthereum/leanSpec/pull/720) | docs(types): rewrite bitfields.py docs + overhaul doc system | @tcoratger | May 15 | +656 -493 |

**Summary**: This PR focuses on rewriting the documentation for bitfields and overhauling the documentation system, enhancing the clarity and educational value of the specification's documentation.

### Testing

| PR | Title | Author | Merged | Changes |
|----|-------|--------|--------|---------|
| [#714](https://github.com/leanEthereum/leanSpec/pull/714) | fix: generating leanSpec test assets | @shrirajpawar4 | May 14 | +36 -7 |

**Summary**: This PR addresses improvements in the generation of leanSpec test assets, focusing on stability and reproducibility of test fixtures.

## Key Themes

The cross-cutting themes are focused on improving the robustness and usability of the Lean Ethereum specification. These improvements span from core consensus logic to API enhancements and test infrastructure, all contributing to a more reliable and easily verifiable specification. The changes demonstrate an effort to improve the developer experience, ensure safer participation in the consensus, and improve checkpoint sync functionality.

## Stats

- Total PRs: 8
- Contributors: 6
- Lines changed: +2506 / -756