October 2025 (hirosystems/stacks-blockchain-api) - Delivered reliability, correctness, and data integrity improvements across burnchain rewards processing, delegations visibility, and inter-service communication. Key outcomes include corrected burnchain reward reorg handling with a migration script and proper invalidation of rewards during reorgs; updated PostgreSQL queries to filter revoked pool delegations and ensured tests cover active delegations; added a removeNullBytes sanitization utility and applied it to vm_error and smart_contract_source_code to prevent data corruption; migrated RedisNotifier to Redis streams (XADD) for more reliable update publishing, with corresponding test updates. Collectively, these changes reduce data inconsistencies, improve user-visible correctness, and strengthen system resilience for blockchain events and notifications.

September 2025 monthly summary for hirosystems/stacks-blockchain-api: Delivered a Redis-based notifier to broadcast Stacks index progress, including canonical blocks, reorg events, and block times; extended data store to track block headers during reorgs; prepared integration points for external consumers (e.g., Chainhooks) by emitting standardized Redis messages. These changes enable real-time visibility, better observability, and streamlined external integrations, delivering business value by reducing reconciliation time and enabling proactive downstream processing.

This month focused on stabilizing and hardening the hirosystems/stacks-blockchain-api endpoint used by key client integrations. Implemented a deterministic pagination fix for the POX Cycle Signer Stackers query, addressing inconsistent ordering when multiple rows share the same locked status. The change improves API reliability, reduces pagination-related edge cases, and sets the stage for future performance tuning and pagination enhancements.

During July 2025, the team delivered key features, stability improvements, and observability enhancements for hirosystems/stacks-blockchain-api, focusing on performance, data integrity, and operational visibility. Highlights include RBF-related mempool optimizations, standardized block time attribution across versions, hardening of API pagination, enhanced balance accounting during re-orgs, and Prometheus metrics for chain tip and burn block heights. These changes improved throughput, accuracy, and monitoring, enabling faster transaction processing and more reliable blockchain data while aligning with SIP-031 supply projections.

June 2025 monthly summary for hirosystems/stacks-blockchain-api. Focused on improving correctness and reliability of mempool and balance-related APIs, with concrete feature delivery and robust fixes that enhance business value and developer experience. Key features delivered: - Mempool Replace-by-Fee tracking: added replaced_by_tx_id to track transactions replaced in the mempool, enabling precise handling of RBF scenarios during fee adjustments or congestion. Major bugs fixed: - Balance endpoint bug: miner rewards duplication fixed by removing the redundant addition of total miner rewards; includes a new test case to verify balance calculation after miner rewards are applied and API response accuracy. Overall impact and accomplishments: - Increased API reliability and data integrity for mempool and balance endpoints, reducing edge-case discrepancies in RBF handling and miner reward reporting. This supports more accurate monitoring, reporting, and downstream tooling. Technologies/skills demonstrated: - API development and maintenance (mempool and balance logic) - Test-driven development and regression testing - Commit-level traceability and change impact analysis

May 2025 monthly summary for hirosystems/stacks-blockchain-api: Delivered a targeted set of features, stability improvements, and performance optimizations that enhance balance accuracy, data consistency, and developer experience. These changes drive business value through more reliable on-chain balance calculations, faster data lookups for analytics, and richer error visibility for failed transactions.

Month: 2025-04 | Key features and improvements delivered for hirosystems/stacks-blockchain-api focused on reliability, migration support, and performance: - CI/CD modernization and Docker image artifact corrections: removed Docker image pushes to the old repository, eliminated Discord notifications, and updated image artifact handling to ensure builds come from the correct rosetta-cli release. Notable commits include 4995bc879a62051e86202dcf7b9b0873ce3a1134, 83e0492dbcd1e9b579ab15c1349c5ed3cb938002, and d707c5898031ceadcdffb65d536ea74ea7a42e66. - API deprecation and migration guidance: announced and enabled deprecation of legacy endpoints with migration guidance to v2 balances, including deprecation of the mempool/dropped endpoint, with test adjustments and changelog updates. Key commits: 32868dd091b89023e1b75317b76ce944680e4784, 576d05bfb843852bd4d6fc2e1f863f983568fbe6, c2b4c4993fbe8f4d75052ae0e16cbbe4e8384d3a. - Database performance improvements: optimized core queries through index improvements on contract event lists, refactored block transaction lookups with CTEs, and refined Rosetta current block retrieval to align with chain tip. Relevant commits: e1044d1f2cdbe4a202193794d04a8bbdd0ac9592, e69f9e4149d3bcedee4d47a3e4a8f1ea2b8ff964, 78ebad09b710d9045c0b9885a0dffbf344771e6a. - BNS endpoint correctness fix: fixed handling of the unanchored parameter for the BNS names endpoint to ignore unanchored results and added tests to verify correct behavior. Commit: 3d337256fc186a359d49b88cf321324bc1bd6326. Top achievements: - CI/CD modernization with artifact correctness and removed noisy integrations. - Migration-ready API deprecation with clear guidance and changelog updates. - Noticeable performance gains in core queries and block data retrieval. - Correctness fixes with accompanying tests to prevent regressions in BNS endpoints. Overall impact and business value: - Reduced operational risk and deployment pain by streamlining CI/CD and artifact handling. - Accelerated customer migration to v2 endpoints, minimizing disruption and clarifying roadmap. - Improved user-facing performance (lower latency for balance lookups, faster Rosetta current block retrieval). - Strengthened product reliability with targeted bug fixes and test coverage. Technologies and skills demonstrated: - Docker/CI pipelines, artifact management, and release hygiene. - API lifecycle management (deprecations, migrations, changelog automation). - SQL performance tuning (indexes, CTEs) and data access optimizations. - Testing discipline and documentation (tests, changelog updates).

March 2025: Fixed OpenAPI documentation deployment in hirosystems/stacks-blockchain-api by correctly placing OpenAPI spec files in the Vercel output directory after build, ensuring reliable API docs serving.

February 2025 monthly summary for hirosystems/stacks-blockchain-api focusing on reliability and observability. Delivered two impact-focused changes: mempool statistics deadlock remediation and event processing latency observability. These changes enhance reliability, performance visibility, and business value.

January 2025: Delivered four major enhancements to the stacks-blockchain-api focusing on observability, data fidelity, dynamic pricing, and user experience. Key outcomes include improved burn-block observability through Prometheus metrics, richer block metadata via tx_total_size with a safe migration path, smarter fee estimation responsive to network utilization, and clearer user-facing balance visibility with mempool-adjusted balances. These changes enhance reliability, operational monitoring, and developer/user experience, enabling better decision-making and throughput. Technical highlights include Prometheus metrics integration, database migrations with nullable fields, environment-driven feature controls, and mempool-aware API responses. Overall, the work drives better capacity planning, pricing transparency, and wallet/app integrations in production.

December 2024 Monthly Summary: Focused on delivering performance and data-model improvements with measurable business impact. In stacks-core, implemented mempool transaction ordering improvements and selection strategies, including nonce- and fee-rate-based ordering, new walk strategies, and performance optimizations, backed by a comprehensive test suite. In stacks-blockchain-api, completed NFT custody data model simplification and API cleanup, migrating away from obsolete nft_custody_unanchored and updating queries/routes to exclusively use nft_custody. Overall impact: Improved transaction processing throughput and reliability, cleaner data model, and streamlined API surface. These changes reduce maintenance burden and accelerate future enhancements for mempool efficiency and NFT custody management. Technologies/skills demonstrated: Mempool algorithm design, test-driven development, lint/style/test improvements, database/schema migrations, API refactoring, and performance tuning.