---
title: "2025-09-22 Codex weekly"
tags:
- "codex-updates"
date: 2025-09-15
lastmod: 2025-09-22
draft: false
---

## Week 38 September 2025

### [Replace bittorrent in status-go](https://github.com/codex-storage/nim-codex/milestone/8)

1. [BlockExchange Performance and reliability](https://github.com/codex-storage/nim-codex/issues/974)
- **achieved**:
- Enhanced peer selection: Implemented multi-factor scoring algorithm considering peer load, exchange recency, success rate, and response time
- Improved load balancing: Distributed block requests across multiple peers in blockPresenceHandler instead of sending all to announcing peer
- Discovery engine optimization: Added peer count limits to prevent unbounded accumulation while maintaining redundancy, with least-active peer removal
- Memory optimization: Reduced default fetch batch size, implemented chunked onBatch processing to prevent memory accumulation, and added buffer reuse to reduce GC allocation churn
- **next**:
- Continue memory consumption optimizations in block exchange pipeline
- Investigate memory usage patterns in block batching and peer context management
- Profile under concurrent load to identify presure points
- **blockers**:

3. [Identify Swarm Participation Limits (DHT Scaling)](https://github.com/codex-storage/codex-research/issues/204)
- **achieved:**
- DHT scaling research [document](https://hackmd.io/@codex-storage/HkGRPTTYlg) reviewed.
- **next:**
- Refine the document and address the review comments.
- Research existing DHT simulations and compare results.
- **blockers:**

4. [Implement a Codex library so that clients can use Codex directly from their apps](https://github.com/codex-storage/nim-codex/issues/1220)
- **achieved:**
- Exposed core Codex APIs: version, revision, repo, peerId, spr, debug information.
- Added ability to change log level.
- Implemented peer connection support.
- Exposed the upload feature with two ways:
- Chunks: 4-step flow (init, upload chunk, complete, cancel) with pause/resume support.
- Filepath: 3-step flow (init, upload, cancel).
- **next:**
- Extend Go wrapper API to allow cancellation of ongoing uploads.
- Implement download feature.
- **blockers:**

5. [Integration with status-go](https://github.com/codex-storage/nim-codex/issues/1304)
- **achieved**
- documented running running unit tests for status-go: [codex-docs-obsidian/pull/19](https://github.com/codex-storage/codex-docs-obsidian/pull/19) (direct link to the document: [Running Unit Tests for status-go](https://github.com/codex-storage/codex-docs-obsidian/blob/spec/codex-status-go-prototype/10%20Notes/Running%20Unit%20Tests%20for%20status-go.md)),
- added a small convenience script to start a docker containiner running a waku node that is suitable for some of the unit tests: [status-go/pull/6930](https://github.com/status-im/status-go/pull/6930) (`_assets/scripts/run_waku.sh in`),
- coding the actual integration
- **next:**
- have basic POC finished (without fixing all the relevant tests, but having things in place to confirm that POC is working)
- **blockers:**

### [Research future work](https://github.com/codex-storage/nim-codex/milestone/9)

1. **Altruistic Mode**

- **Document:** [Proposal for outsourcing local erasure coding](https://hackmd.io/SazdX1SqSs6hNjtc-3B2BQ) (especially interesting together with file bundling). Next: prototype implementation
- **Document:** Updates to our [collection of the research questions/problems](https://hackmd.io/@codex-storage/rJeZeJC9gg) related to the altruistic mode.
- **Document:** Consolidated understanding of [Swarm networking](https://hackmd.io/sHpB5N39QVqLSJV-k_-jLQ) and ongoing work with [Swarm Incentives](https://hackmd.io/aSkvCy-LT8GjjdOzTrrLfw).
- Ongoing work in (re-)analysing Arweave, Sia, and Walrus based both on previous research done in the group (students and departed members), and more recent publications as we rebuild our knowledge on related approaches.

### Misc

1. **Testnet Decommission**
- achieved:
- Merged docs update: [90](https://github.com/codex-storage/codex-docs/pull/90)
- next:
- Example of docs page with support for multiple versions: [WIP](https://github.com/codex-storage/codex-docs/pull/91)