June 2026 highlights for breez/spark-sdk: Delivered a major migration to SparkSigner, centralizing all Spark signing logic and removing most direct low-level signer calls from user flows; implemented SparkSignerAdapter wrapping the in-process Signer, migrated deposit signing to the SparkSigner backbone, and completed the full routing of signing operations (refunds, transfers, claims, coop-exits, token and invoice signing, and lightning preimage) through SparkSigner. Achieved BreezSigner split into a Spark signer and a non-Spark BreezSigner, enabling a builder that derives both signers from a single seed and WASM bindings for ExternalSparkSigner; removed identity_public_key from Breez signer to improve symmetry. Improved Turnkey integration: added create_turnkey_signer factory, exported ExternalSigners alongside Breez/Spark signers, added tests and cross-version compatibility work, and hardened reliability with request-timeouts, Retry-After handling, and recovery-id checks. Evolved External signer and FFI layers: added ExternalSparkSigner trait and adapters, FFI blocks, and multi-signer factory; refactored key management to a path-based signer trait and eliminated non-default KeySet in favor of derivation paths. Strengthened testing and security: broadened cross-signer test coverage, hardened logs by redacting preimages, and aligned function naming across wasm and native layers.

Month 2026-05 delivered major SDK enhancements focusing on robust session management, security, performance, and cross-language bindings, with clear business value in reliability, onboarding, and scalability. Key infrastructure: a new shareable and balanced connection manager with tests; cross-language exposure of SessionManager via UniFFI, WASM, and Flutter, including PostgreSQL/MySQL backends; at-rest session token encryption; a caching layer with persistence tests to validate cross-pod session sharing; and HTTP stack improvements including a shared HttpClient for GraphQL auth and SDK-wide usage. These efforts reduce integration risk, improve security posture, shave latency, and enable broader partner and WASM/Flutter adoption.

April 2026 monthly summary for breez/spark-sdk: Delivered reliability, scalability, and developer-experience improvements across the LNURL server, webhook handling, and repository tooling. Key architectural work centered on database robustness and domain management, while webhook security and observability were enhanced. The month also included targeted bug fixes and performance optimizations that improve data integrity and user-facing reliability.

March 2026: Breez Spark SDK delivered robust LNURL enhancements, configuration simplifications, and performance improvements, while expanding test coverage and deployment reliability. Notable progress includes simplifying configuration by removing include-spark-address from config, integrating LNURL-Verify into the index, performance-focused indexing on user pubkeys, batch processing for paid invoices to reduce server pressure, and substantial lightning address reliability/privacy improvements, complemented by health checks and multi-instance readiness for scalable deployments. These changes reduce operational risk, improve user experience, and enable smoother, more scalable LNURL and webhook flows.

February 2026 — Breez Spark SDK monthly summary. Focused on API modernization, synchronization reliability, cross‑platform bindings, and robustness of transfer/payment workflows to deliver business value with higher data integrity, faster delivery, and scalable CI/CD. Delivered major GraphQL API improvements, strengthened sync and migrations, established Flutter codegen with multi‑platform bindings, expanded LNURL capabilities, and improved transfer handling.

January 2026 performance summary for breez/spark-sdk. Focused on delivering financial processing accuracy and performance improvements. Highlights include: (1) deposit_amount exposure and fee calculation derived from the original deposit to improve financial accuracy and consistency across multiple user request types; (2) memory-optimized leaf selection to reduce memory footprint and improve throughput for target value matching. These changes lay groundwork for higher reliability in deposits processing and scalability under larger workloads.

December 2025 saw Breez s Spark SDK deliver a targeted set of features and reliability improvements across LNURL handling, real-time synchronization, domain management, and packaging. The changes enhance cross-language access to payment metadata, strengthen security with optional replay-protection timestamps while maintaining backward compatibility, and improve the robustness of withdrawal flows and real-time events. Additionally, DB-backed domain management and DevOps enhancements reduce release risk and streamline deployments, driving faster integrations, better user experiences, and more maintainable infrastructure.

November 2025 performance summary for breez/spark-sdk. This month focused on delivering user-facing LNURL improvements, consolidating platform bindings for multi-language support, and strengthening the CI/tooling stack to improve release reliability and cross-team collaboration. The team also advanced privacy-aware real-time sync, enhanced key derivation capabilities, and expanded test coverage to reduce regressions as adoption grows across Flutter, C#, and other bindings.

October 2025 performance summary for breez/spark-sdk: Delivered core payment data lifecycle improvements, substantial UX and reliability gains, and targeted security enhancements that collectively accelerate time-to-value for operators and developers. The month also showcased strong code quality efforts and improved developer experience through documentation updates and formatting improvements.

September 2025: Delivered core LNURL server capabilities, modernized the data layer, and strengthened cross-platform support and security. The month focused on delivering business-value features with robust, scalable implementations, improving reliability, performance, and developer experience across Breez SDKs.

August 2025 milestone focused on reliability, CI readiness, and feature parity across Breez SDKs, delivering business value through code quality, robust testing, and expanded capabilities. Key outcomes include consolidation of Rust Clippy lint fixes, substantial build-system and CI infrastructure enhancements, and the integration of Breez SDK crates into CI/tests with aligned makefiles. Feature work includes token configuration support for CLI/config and LNURL Pay spec integration with enriched payment metadata, complemented by retry channel improvements and operator readiness coordination. Major bug fixes addressed deposit claim handling (ignoring already-claimed transfers) with added tests for unconfirmed and confirmed deposits, along with code formatting and dependency cleanup to reduce drift. Overall impact: faster iteration cycles, safer deployments, improved transfer processing reliability, and broader business value from LNURL Pay and configurable tokens.

July 2025: Delivered a strong set of wallet, CLI, signing, and reliability improvements across Breez SDKs, focusing on business value, performance, and developer experience. Highlights include scalable wallet leaves handling, enhanced CLI tooling for deposits and transfers, proto/signer updates, end-to-end transfer flow improvements, and enhanced observability and concurrency controls.

June 2025 performance summary for breez/spark-sdk. Key emphasis on delivering core deposit and tree management capabilities, infrastructure improvements, and security hardening. The month delivered the deposit tree core integration with the Spark client, in-memory token metadata storage, identity-key signing, and operator RPC refactor, along with comprehensive build/CI enhancements and TLS-enabled networking. Major bugs fixed included authentication mutex optimization, removal of unsafe unwrap/todo and unused functions, and a proof-of-possession hash order fix. These efforts improved stability, scalability, and security, enabling safer deposits, faster onboarding, and more reliable deployments.

May 2025 monthly summary for breez/breez-sdk-greenlight: Delivered two core improvements focused on security, reliability, and maintainability. Key features delivered include upgrading core dependencies to CLN 24.11 and related libraries to the latest compatible versions to preserve security and compatibility with downstream systems. Implemented graceful shutdown for invoice and log streaming tasks using tokio::select! to wake on shutdown or during sleeps, reducing termination latency and avoiding stuck tasks. These changes improve reliability of streaming workflows and reduce deployment risk. Overall impact: enhanced security posture, improved runtime reliability, and smoother integrations with CLN 24.11. Technologies/skills demonstrated: Rust, Tokio async patterns, dependency management, and cross-crate API compatibility (bitcoin, tonic, reqwest).

April 2025 (2025-04) – Breez SDK Greenlight focused on reliability, data integrity, and developer productivity. Delivered concrete features and fixes that improve user experience, reduce support load, and stabilize the build pipeline across CI, linting, and bindings. Business value anchored in safer refunds, durable open channel handling, and precise fee estimation, with enhanced feedback for trampoline payments.

March 2025 monthly summary for breez/breez-sdk-greenlight focused on delivering core Taproot-enabled swaps, strengthening refund reliability, expanding testing and observability, and reinforcing data integrity and developer experience. Business value: faster, more secure settlement flows; reduced refund risks; improved monitoring and docs for faster integration.

February 2025 performance highlights for breez/breez-sdk-greenlight focused on expanding server-side capabilities, robust channel management, and invoice lifecycle control. Delivered three key features with clear business value: Taproot Swapper integration on Breez server, Channel opening decision helper, and NodeAPI delete_invoice support. These changes improve on-chain swap throughput, optimize liquidity decisions, and streamline invoice lifecycle management.

December 2024 monthly summary for breez/breez-sdk-greenlight focusing on reliability, protocol versioning, and data integrity. Delivered impactful features and a critical cleanup to improve system correctness and maintainability, with measurable business value in reliability, traceability, and correctness.

November 2024 monthly delivery highlights for breez/breez-sdk-greenlight: delivered user-facing feature improvements, API modernization, and resilience hardening with a clear focus on business value, reliability, and developer experience. Key features include enhanced swap data listing with CLI filtering, modernization of on-chain payments APIs with MPP support, and extensive network-fallback refactors to improve uptime. A critical bug fix ensures correct fee accounting by removing a duplicate claim fee calculation. These efforts reduce time-to-value for developers, increase production reliability, and enable broader payment capabilities.

October 2024 monthly summary for breez/breez-sdk-greenlight focused on reliability improvements, maintainability, and clearer code paths across core streaming and block syncing workflows. The team delivered four key features aimed at stabilizing operation, improving observability, and reducing risk during outages or state transitions, while keeping core behavior intact.