input-output-hk/cardano-js-sdk
Oct 2024 – Jul 2025
7 Months active
Languages Used
TypeScriptJavaScriptYAMLtypescriptyaml
Technical Skills
Data PersistenceDatabase ManagementError HandlingTypeScriptAPI IntegrationBackend Development
Martynas Kazlauskas
PROFILE
Martynas Kazlauskas
Martynas Kazlauskas contributed to the input-output-hk/cardano-js-sdk repository, focusing on wallet development, transaction security, and data integrity for Cardano applications. Over seven months, Martynas engineered features such as asynchronous wallet initialization, robust output validation, and CIP30-compliant witness set filtering, using TypeScript and JavaScript. He refactored cryptographic infrastructure for mobile performance, improved error handling, and enhanced end-to-end testing with RxJS and CI/CD integration. His work addressed critical issues like data loss, signature exposure, and transaction reliability, demonstrating a deep understanding of backend development and Cardano SDK internals while delivering maintainable, secure, and scalable solutions for dApp integrations.
Overall Statistics
Feature vs Bugs
70%Features
Repository Contributions
47Total
Bugs
7
Commits
47
Features
16
Lines of code
8,853
Activity Months7
Your Network
111 people
Work History
July 2025
3 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for input-output-hk/cardano-js-sdk: Delivered a critical overhaul of transaction output validation to strengthen correctness and prevent address-type bugs, with updated tests and explicit address context. Implemented validateOutput, adjusted minimum coin calculations using actual address size for Byron addresses, and refactored related tests. This work improves transaction safety, reduces risk of miscalculation, and enhances maintainability.
3 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for input-output-hk/cardano-js-sdk: Delivered a critical overhaul of transaction output validation to strengthen correctness and prevent address-type bugs, with updated tests and explicit address context. Implemented validateOutput, adjusted minimum coin calculations using actual address size for Byron addresses, and refactored related tests. This work improves transaction safety, reduces risk of miscalculation, and enhances maintainability.
July 2025
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025 (2025-06) monthly summary for input-output-hk/cardano-js-sdk: Implemented CIP30 Wallet API Witness Set Filtering to tighten signature exposure. This refactor ensures only signatures generated by the current operation are included in the CBOR witness set, preventing leakage of pre-existing signatures and enhancing security and verification for dApps. Associated commit: fix(wallet): resolve only the own signed portions of the witness set (8f7e2c7247558be08b2684403e2a6ef53654da22).
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025 (2025-06) monthly summary for input-output-hk/cardano-js-sdk: Implemented CIP30 Wallet API Witness Set Filtering to tighten signature exposure. This refactor ensures only signatures generated by the current operation are included in the CBOR witness set, preventing leakage of pre-existing signatures and enhancing security and verification for dApps. Associated commit: fix(wallet): resolve only the own signed portions of the witness set (8f7e2c7247558be08b2684403e2a6ef53654da22).
May 2025
4 Commits • 2 Features
May 1, 2025May 2025 monthly summary for input-output-hk/cardano-js-sdk: Delivered key enhancements to cryptography infrastructure and type safety, focusing on performance and maintainability for mobile usage. Implemented a unified Blake2b hashing interface, injected cryptographic dependencies into Bip32Account, and refactored key derivation and address hashing methods to be synchronous. Also enhanced HexBlob typing to improve type safety and standardization across the codebase.
4 Commits • 2 Features
May 1, 2025May 2025 monthly summary for input-output-hk/cardano-js-sdk: Delivered key enhancements to cryptography infrastructure and type safety, focusing on performance and maintainability for mobile usage. Implemented a unified Blake2b hashing interface, injected cryptographic dependencies into Bip32Account, and refactored key derivation and address hashing methods to be synchronous. Also enhanced HexBlob typing to improve type safety and standardization across the codebase.
May 2025
January 2025
18 Commits • 7 Features
Jan 1, 2025January 2025 accomplishments for input-output-hk/cardano-js-sdk: Delivered major reliability, visibility, and performance improvements across testing, error handling, wallet history, and data retrieval. Key outcomes include an end-to-end testing framework with a stub HandleProvider and enhanced test scaffolding, improved Blockfrost error visibility and detailed error propagation, reward account history enhancements with partial history support and real-time transaction observable, chain history and asset visibility improvements with ordering/pagination and complete asset data, and critical transaction reliability fixes including CIP30 race handling, latest-transaction fetch correctness, and a history cap to boost performance.
January 2025
18 Commits • 7 Features
Jan 1, 2025January 2025 accomplishments for input-output-hk/cardano-js-sdk: Delivered major reliability, visibility, and performance improvements across testing, error handling, wallet history, and data retrieval. Key outcomes include an end-to-end testing framework with a stub HandleProvider and enhanced test scaffolding, improved Blockfrost error visibility and detailed error propagation, reward account history enhancements with partial history support and real-time transaction observable, chain history and asset visibility improvements with ordering/pagination and complete asset data, and critical transaction reliability fixes including CIP30 race handling, latest-transaction fetch correctness, and a history cap to boost performance.
December 2024
7 Commits • 3 Features
Dec 1, 2024December 2024 performance summary for input-output-hk/cardano-js-sdk: Delivered asynchronous wallet initialization and migration to extension storage, optimized wallet performance for large UTxO sets, and hardened data polling with robust error handling. Addressed critical tx submission reliability with Blockfrost fix and resolved build/dependency issues to ensure reliable TypeScript compilation. Overall, improved startup time, UI responsiveness, and reliability, enabling more scalable wallet experiences and smoother integration with Cardano services.
7 Commits • 3 Features
Dec 1, 2024December 2024 performance summary for input-output-hk/cardano-js-sdk: Delivered asynchronous wallet initialization and migration to extension storage, optimized wallet performance for large UTxO sets, and hardened data polling with robust error handling. Addressed critical tx submission reliability with Blockfrost fix and resolved build/dependency issues to ensure reliable TypeScript compilation. Overall, improved startup time, UI responsiveness, and reliability, enabling more scalable wallet experiences and smoother integration with Cardano services.
December 2024
November 2024
13 Commits • 2 Features
Nov 1, 2024November 2024: Strengthened the cardano-js-sdk with a focus on Blockfrost integration, provider stability, and CI-ready testing. Delivered browser-friendly BlockfrostAssetProvider with refined metadata handling, and refactored the rewards provider to use a shared pagination utility for reliability. Hardened HttpProvider to align with standard object behavior, improving web-extension messaging compatibility. Expanded E2E testing and CI integration to cover Blockfrost providers and aligned CIP-25 v2 test coverage. Stabilized network info context binding and mitigated local slotLength edge-cases for Blockfrost-backed networks in development and CI. These changes reduce defects, accelerate feature delivery, and improve data reliability for downstream applications.
November 2024
13 Commits • 2 Features
Nov 1, 2024November 2024: Strengthened the cardano-js-sdk with a focus on Blockfrost integration, provider stability, and CI-ready testing. Delivered browser-friendly BlockfrostAssetProvider with refined metadata handling, and refactored the rewards provider to use a shared pagination utility for reliability. Hardened HttpProvider to align with standard object behavior, improving web-extension messaging compatibility. Expanded E2E testing and CI integration to cover Blockfrost providers and aligned CIP-25 v2 test coverage. Stabilized network info context binding and mitigated local slotLength edge-cases for Blockfrost-backed networks in development and CI. These changes reduce defects, accelerate feature delivery, and improve data reliability for downstream applications.
October 2024
1 Commits
Oct 1, 2024October 2024: Delivered a critical data integrity bug fix for PouchDbCollectionStore in input-output-hk/cardano-js-sdk, preserving data during setAll operations when upsert fails and preventing unintended data loss. This fix improves the reliability of bulkDocs workflows and reduces the risk of data corruption in production.
1 Commits
Oct 1, 2024October 2024: Delivered a critical data integrity bug fix for PouchDbCollectionStore in input-output-hk/cardano-js-sdk, preserving data during setAll operations when upsert fails and preventing unintended data loss. This fix improves the reliability of bulkDocs workflows and reduces the risk of data corruption in production.
October 2024
Activity
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Quality Metrics
Correctness91.0%
Maintainability89.6%
Architecture87.0%
Performance84.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
JavaScriptTypeScriptYAMLtypescriptyaml
Technical Skills
API DesignAPI IntegrationAPI integrationAddress ValidationAsynchronous ProgrammingBackend DevelopmentBrowser CompatibilityBuild ConfigurationCI/CDCI/CD ConfigurationCIP-25CIP30CardanoCardano DevelopmentCardano SDK
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