June 2026 monthly performance summary for matter-labs/zksync-os-server. The team focused on reliability, performance, and maintainability across core node subsystems, delivering a mix of feature improvements and refactors that optimize startup times, enhance cross-provider resilience, and simplify future maintenance. Key work spans L1 watcher lifecycle and initialization improvements, provider compatibility fallbacks, standardization of blob formats, mempool architecture refinements, and a re-architected batch processing model for robust batch commitment tracking. A cleanup in gateway migration surface area was also completed to reduce maintenance overhead. Overall, these changes improved uptime predictability, reduced runtime RPC load, and enabled more predictable upgrades.

Concise monthly summary for 2026-05 highlighting value delivered, stability improvements, and maintainability gains across the zksync-os-server stack.

April 2026 monthly summary for matter-labs/zksync-os-server focused on feature delivery and business value. Implemented Settlement Layer Interval Detection using L1 to route batch lookups by settlement layer, aligning processing with L1 cadence and enabling more scalable batch routing. This work lays groundwork for improved throughput and reliability in settlement-based routing, with clear traceability to the commit and feature request.

March 2026 performance summary for matter-labs/zksync-os-server. This month delivered core reliability, performance, and security improvements across the repository, with a focus on advancing prover tooling, system resilience, network stability, and security posture. Business value was achieved through faster proving, more robust shutdown and restart behavior, improved portability, and better observability for operators. Key features delivered include: - Prover tooling upgrades and compatibility: Updated Prover tooling to a newer rustc version and interface to 0.0.14, integrated the prover binary in integration tests to maintain compatibility with the new toolchain, and introduced in-memory Prover Input Generator binaries for faster proving. Commits include 2ca6c086a9974f97c1641cf75744af7099690d2c and 49705f62fcbe7305e8512f0716f7bb2e2e7f7ebe. - Archive handling modernization: Replaced direct tar/gtar usage with a Rust-based tar handling implementation supporting plain and gzip archives, improving portability and reliability. Commit: a57d6e410fea2ed894ebb8b24682adeb8607dc47. - Graceful shutdown and resilience: Implemented graceful shutdown using reth-tasks Runtime for proper resource management and state persistence during restarts; added integration tests for correctness of shutdown and state retention; increased stack size to 16 MiB to prevent deep call stacks; improved handling of closed inbound channels to ensure orderly shutdown. Commits: e6a31b84fdfd3c220d61f5586aa94d69d270c6c6. - Network stability, observability, and policy enforcement: Introduced chain-aware fork ID filtering for discv5 peers to improve network stability, stored fork IDs in ENR with a zksync-os key, and added metrics support using the vise library plus dynamic settlement layer selection. Commits: e9b35864d2cbcc1a43f7cfab30aa00410375bbbf, 2e1ec9d114ca6e325fb05f7a3240c7997d2326cd, dd1bc0c0dc1bd3b84c0c6615102777fa314a2520. - Security hardening and audits: Updated cargo-deny and cargo-audit configurations to improve security auditing, remove outdated advisories, and adjust ignore settings for vulnerabilities awaiting patches. Commit: 86c934ec18a51d9327c4d0bdd345b7e0cdc98e0d. Overall impact and accomplishments: - Significantly improved reliability, uptime, and developer velocity through faster proving and robust shutdown flows. - Enhanced network stability and observability across chains, enabling safer cross-chain operation and easier incident response. - Strengthened security posture with updated auditing tooling and configurations, reducing risk exposure. - Demonstrated advanced Rust capabilities, integration testing, and scalable runtime patterns (reth-tasks) in production-grade services. Technologies and skills demonstrated: - Rust ecosystem, Prover tooling integration, and in-memory binaries for testing - Rust-based tar handling (portability and reliability gains) - Graceful shutdown patterns with reth-tasks and runtime control - Resource management and debugging for RocksDB and large proofs - Chain-aware network filtering (discv5) and ENR key usage - Metrics collection via vise library and dynamic settlement layer selection - Security tooling workflows (cargo-deny, cargo-audit)

Concise monthly summary for 2026-02 focused on matter-labs/zksync-os-server. Key developments emphasize network transport migration and streaming improvements, persistent storage reliability, API modernization, gas-estimation capabilities, and performance tweaks. All initiatives are aimed at improving reliability, scalability, and developer experience for self-hosted deployments and stage environments.

January 2026 — Focused on reliability, performance, and network readiness for ZKSync OS. Delivered key features and stability improvements across batch processing, networking, RPC, and testing infrastructure. Highlights include a migration to a batch-data access model via CommittedBatchProvider (eliminating S3 dependence for ENs and the priority tree), a new zks RLPx subprotocol with multi-version support and node-version refactor, NetworkService groundwork for background operation, and substantial RPC correctness and initialization safeguards. In addition, maintained code quality and testing capabilities through ABI-encoding cleanup, dependency hygiene, and enhanced interop testing. Overall impact: faster batch processing, more robust cross-version networking, reliable RPC interactions, and stronger testing/maintenance for safer rollouts and business growth.

December 2025 monthly summary: The zksync-os-server team delivered reliability, scalability, and upgrade-readiness improvements across L1 watcher, batch processing, and networking layers. Key outcomes include hardened L1 watcher state recovery with linear revert search and an Anvil-case specialization; batch recreation using L1 watcher data with start-from-last_executed_batch+1, reducing S3 reliance; correctness hardening in proof retrieval by validating executed blocks earlier to avoid dirty data reads; environment-agnostic networking with HTTP/2 replay and real HTTP server/client for batch verification; protocol upgrade readiness with V6 support and robust upgrade management; and maintenance work to upgrade core dependencies and improve observability. Overall impact: reduced downtime during restarts, safer and faster state recovery, scalable batch ops, and clearer upgrade paths for customers.

November 2025 monthly summary for matter-labs/zksync-os-server focused on delivering observability, scalability, upgrade readiness, and reliability improvements that drive business value. Key work spanned mempool observability, RPC scalability enhancements, startup resilience, and config/upgrade readiness, with careful attention to testing and rollout readiness.

October 2025 across matter-labs/zksync-os-server and matter-labs/zksync-os delivered a blend of feature delivery, reliability improvements, and maintainability gains that tighten performance, resilience, and developer experience. The work spans core transaction model enhancements, RPC and L1 tooling upgrades, and strategic simplifications that reduce operational complexity while preserving business value.

September 2025: Strengthened CI/security/testing, expanded RPC tracing and gas/nonce visibility, improved state reliability, and completed core protocol upgrades and observability. Also progressed EIP-2718 encoding compliance and multivm integration readiness via interface migration across zksync-os-related repos.

August 2025 performance summary for the ZKSync OS platform across matter-labs/zksync-os-server and matter-labs/zksync-os. The month delivered a series of high-impact features, stability improvements, and API enhancements aimed at increasing throughput, reliability, and developer productivity. Key architectural changes modernized storage, enabling faster batch processing and scalable state of the art L2/L1 interactions. API improvements expanded functionality and observability, while build and tooling optimizations reduced footprint and faster iteration. Overall, the work strengthens the platform foundation for higher transaction throughput, improved traceability, and easier operational monitoring.

July 2025 monthly summary for development work across multiple repos. The month focused on accelerating delivery cycles, hardening reliability, and aligning architecture with future scalability by simplifying types and migrating components to the Alloy ecosystem. Performance, testing, API, and infrastructure improvements delivered measurable business value through faster CI feedback, more robust APIs, and cleaner code organization.

June 2025 monthly summary focusing on feature delivery, bug fixes, and platform improvements across matter-labs/anvil-zksync, zksync-sdk/zksync-ethers, and matter-labs/zksync-os-server. Highlights include reliability improvements for contract deployments, robust fee data handling, enhanced local debugging capabilities, and end-to-end L1-L2 coordination enhancements.

May 2025 performance highlights across three repositories (anvil-zksync, block-explorer, zksync-ethers) focused on VM upgrade, reliability improvements, API expansion, and a strategic deprecation plan to align with the broader ecosystem. The work delivered improved platform compatibility with the latest VM (MultiVM V28), enhanced gas estimation accuracy, richer debugging insights, expanded public API surface for token balances, and a forward-looking deprecation/migration strategy to guide developers toward supported pathways.

April 2025 performance summary for matter-labs/anvil-zksync. Focused on delivering production-ready features, fixing critical correctness issues, and improving developer experience. Key work spanned EVM emulator readiness, L1 batch automation, accurate historical storage access, CLI reliability, and token configurability. A notable bug fix addressed zero-value storage reads to ensure correct state semantics. The changes collectively improve network reliability, test coverage, and fee/interaction accuracy, while keeping the codebase healthy with toolchain upgrades.

March 2025 performance summary for matter-labs/anvil-zksync: Delivered core transaction processing refinements with replay support, expanded cross-chain L1-L2 interoperability across multiple protocol versions, rearchitected VM execution with system logs, stabilized CI/build pipelines, centralized base-fee enforcement, and standardized artifact packaging for reproducible system contracts. These changes reduce risk, improve throughput, enable broader L1/L2 capabilities, and improve developer productivity with repeatable builds and tests.

February 2025 monthly summary for matter-labs/anvil-zksync: End-to-end Layer 1 batch lifecycle integration, TLS security modernization, CI/licensing tooling updates, and API server reliability improvements. All work advances batch processing reliability, security posture, and build/deploy maturity, enabling faster release cycles with fewer runtime incidents.

January 2025: Focused on architecture refinements, release readiness, and protocol upgrades for matter-labs/anvil-zksync. Key features delivered include a fork management overhaul with a dedicated ForkClient and Fork structure, plus CLI support for forking at a specific transaction hash; a queue-based block production system that improves node responsiveness and maintainability; and comprehensive release management with a protocol upgrade to v26 and ecosystem alignment (CI paths, lockfiles, crate version bumps, and tooling). Major fixes addressed correctness and stability, including replay of transactions when forking at a tx hash, release attestation fixes, and aligning reset/test behavior. The work delivered measurable business value through faster, more reliable forking, improved node throughput, and smoother upgrades across crates, with demonstrable skills in refactoring, async systems, and release engineering.

December 2024 — matter-labs/anvil-zksync: Delivered RPC surface modernization, transaction processing improvements, internal refactors, and network accessibility enhancements. These changes improve reliability, debugging, and cross-network operability, enabling faster iteration and smoother remote integration.

November 2024 monthly highlights: Delivered a robust Ethereum spec conformance testing infrastructure and CI integration for the ZKSync Era test node, expanded the Anvil testing surface with time control, mining, impersonation, and logging capabilities, and refactored the codebase for maintainability and compatibility with Anvil/Hardhat behavior. No explicit major bug fixes documented this month; the focus was on feature delivery, test reliability, and architectural improvements, delivering clear business value by increasing test coverage, reducing validation time, and improving developer productivity. These efforts position the project for faster feedback cycles and more deterministic testing in production-like scenarios.

October 2024 monthly summary for matter-labs/anvil-zksync: Delivered Block Information Enrichment to align block data with zksync-era specifications, expanded block fields for richer analytics, and improved data reliability. Refactored tests to validate the new fields and prevent regressions. Fixed minor issues in block transaction population to deliver more complete block data, enhancing downstream accuracy and user experience. Commit reference included for traceability: 3cd918b7fd5c660dec71389d45f4abb4de400a2c.