UnspendableLabs/Horizon-Wallet
Nov 2024 – Sep 2025
8 Months active
Languages Used
CSSDartFlutterHTMLJavaScriptTypeScriptYAMLShell
Technical Skills
API IntegrationAsset ManagementAsynchronous ProgrammingBLoCBackend DevelopmentBackend Integration
matt marcello
PROFILE
Matt Marcello
Matt Marcello developed and maintained the Horizon-Wallet platform for UnspendableLabs, delivering over 80 features and 37 bug fixes in eight months. He engineered secure transaction workflows, passwordless authentication, and robust session management, focusing on reliability and compliance. Working primarily in Dart, Flutter, and JavaScript, Matt implemented PSBT signing, asset management, and extension support, while optimizing build pipelines and release processes. His approach emphasized maintainability through code cleanup, refactoring, and rigorous testing. By aligning SDKs, enforcing security policies, and integrating analytics, Matt ensured Horizon-Wallet met evolving business and regulatory needs, demonstrating depth in blockchain, backend integration, and cross-platform development.
Overall Statistics
Feature vs Bugs
69%Features
Repository Contributions
242Total
Bugs
37
Commits
242
Features
83
Lines of code
603,937
Activity Months8
Your Network
2 peopleShared Repositories
2
Work History
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for UnspendableLabs/Horizon-Wallet: Focused on policy compliance updates and release governance to strengthen regulatory posture and user eligibility controls.
1 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for UnspendableLabs/Horizon-Wallet: Focused on policy compliance updates and release governance to strengthen regulatory posture and user eligibility controls.
September 2025
August 2025
6 Commits • 2 Features
Aug 1, 2025In August 2025, Horizon-Wallet delivered key platform improvements across Flutter SDK alignment, build pipeline stabilization, release management, and extension manifest correctness. These changes improved build reliability, reduced toolchain friction, and enhanced release traceability, enabling faster delivery and more predictable deployments for end users. Notable deliverables included updating Flutter version constraints, aligning workflows, incrementing the app release version for patch-level release, and fixing extension manifest formatting so extensions are consistently recognized by the environment. Key commits underpinning these changes include: 67a984c8b684aca3f10e4510472836951b22d014; ce2078a9047f81a184e9da9119e2657ce49f16f0; 941ae760305d4fa6f7a6e3665ca8063aeda726a7; c359ab2c83fa1c983903cc6cf00c959cd893f9d5; 69db4aae0d732f525a81186dbd25eacd5a5e0347; 95d1ab15e6e411e53ee128e6296ad8cccf64d620.
August 2025
6 Commits • 2 Features
Aug 1, 2025In August 2025, Horizon-Wallet delivered key platform improvements across Flutter SDK alignment, build pipeline stabilization, release management, and extension manifest correctness. These changes improved build reliability, reduced toolchain friction, and enhanced release traceability, enabling faster delivery and more predictable deployments for end users. Notable deliverables included updating Flutter version constraints, aligning workflows, incrementing the app release version for patch-level release, and fixing extension manifest formatting so extensions are consistently recognized by the environment. Key commits underpinning these changes include: 67a984c8b684aca3f10e4510472836951b22d014; ce2078a9047f81a184e9da9119e2657ce49f16f0; 941ae760305d4fa6f7a6e3665ca8063aeda726a7; c359ab2c83fa1c983903cc6cf00c959cd893f9d5; 69db4aae0d732f525a81186dbd25eacd5a5e0347; 95d1ab15e6e411e53ee128e6296ad8cccf64d620.
July 2025
1 Commits
Jul 1, 2025July 2025 monthly summary focused on stabilizing the PSBT signing workflow in Horizon Wallet. Delivered a critical bug fix to ensure dummy inputs are filtered out during PSBT signing, so only actual transaction data is signed. This prevents incorrect signing results and improves reliability and user trust in the PSBT flow.
1 Commits
Jul 1, 2025July 2025 monthly summary focused on stabilizing the PSBT signing workflow in Horizon Wallet. Delivered a critical bug fix to ensure dummy inputs are filtered out during PSBT signing, so only actual transaction data is signed. This prevents incorrect signing results and improves reliability and user trust in the PSBT flow.
July 2025
April 2025
21 Commits • 9 Features
Apr 1, 2025April 2025 — Horizon-Wallet (UnspendableLabs) Key features delivered and improvements: - JavaScript bundle and bindings updates to improve frontend performance and compatibility (commits: c09691e6, 1a5388b3). These changes reduce UI fragmentation and improve resilience of the wallet interface across environments. - PSBT signing confirmation flow added/updated to streamline secure transaction signing and reduce user friction (commit: 46c381e5). - Sign Message Form UI enhancement to render the message within the form and improve UX (commit: 9d0526d3). - Persist current account to support session continuity and reduce re-authentication prompts (commit: 93e0160b). - Make Debit.Event.address optional in event processing to increase flexibility in event handling (commit: c5c9655d). - Version bumps across components to align release versions and prepare for production rollout (commits: 350478b8, 2492d622, c6ede822). Major bugs fixed: - Extension build script fix to stabilize builds and reduce CI failures (commit aa4e2127). - Error string handling cleanup to prevent toString() related crashes (commit 2ca3f3eb). - Do not parse events list during wallet import to avoid erroneous event processing (commit 196a8014). - Fix integration tests to improve test reliability (commit 2c748c40). - Formatting fix to maintain codebase consistency (commit a775ab67). Overall impact and accomplishments: April 2025 delivered tangible business value by stabilizing the build and test pipelines, advancing secure transaction flows and UX refinements, and improving session management. The release-ready improvements, including version bumps and UI/UX enhancements, position Horizon-Wallet for a smoother production rollout. Ongoing cleanup work (UI/Repo cleanup) sets the stage for maintainability and faster iteration. Technologies/skills demonstrated: - Frontend/Bindings work with JavaScript bundle optimizations and cross-component integration. - Security-focused UX improvements around PSBT flow and signing confirmations. - State persistence and session management. - Rigorous debugging, test hygiene, and release engineering including version bumps. - Refactoring and cleanup practices contributing to long-term maintainability.
April 2025
21 Commits • 9 Features
Apr 1, 2025April 2025 — Horizon-Wallet (UnspendableLabs) Key features delivered and improvements: - JavaScript bundle and bindings updates to improve frontend performance and compatibility (commits: c09691e6, 1a5388b3). These changes reduce UI fragmentation and improve resilience of the wallet interface across environments. - PSBT signing confirmation flow added/updated to streamline secure transaction signing and reduce user friction (commit: 46c381e5). - Sign Message Form UI enhancement to render the message within the form and improve UX (commit: 9d0526d3). - Persist current account to support session continuity and reduce re-authentication prompts (commit: 93e0160b). - Make Debit.Event.address optional in event processing to increase flexibility in event handling (commit: c5c9655d). - Version bumps across components to align release versions and prepare for production rollout (commits: 350478b8, 2492d622, c6ede822). Major bugs fixed: - Extension build script fix to stabilize builds and reduce CI failures (commit aa4e2127). - Error string handling cleanup to prevent toString() related crashes (commit 2ca3f3eb). - Do not parse events list during wallet import to avoid erroneous event processing (commit 196a8014). - Fix integration tests to improve test reliability (commit 2c748c40). - Formatting fix to maintain codebase consistency (commit a775ab67). Overall impact and accomplishments: April 2025 delivered tangible business value by stabilizing the build and test pipelines, advancing secure transaction flows and UX refinements, and improving session management. The release-ready improvements, including version bumps and UI/UX enhancements, position Horizon-Wallet for a smoother production rollout. Ongoing cleanup work (UI/Repo cleanup) sets the stage for maintainability and faster iteration. Technologies/skills demonstrated: - Frontend/Bindings work with JavaScript bundle optimizations and cross-component integration. - Security-focused UX improvements around PSBT flow and signing confirmations. - State persistence and session management. - Rigorous debugging, test hygiene, and release engineering including version bumps. - Refactoring and cleanup practices contributing to long-term maintainability.
February 2025
31 Commits • 16 Features
Feb 1, 2025February 2025 — Horizon Wallet delivered security hardening, UX improvements, and foundational services across the UnspendableLabs/Horizon-Wallet repo. Notable outcomes include enforcing re-auth and password verification for critical settings, robust session-key handling on timeout, and a set of UX enhancements that improve usability. The month introduced foundational KV storage, extension support, and a more streamlined build pipeline with asset minification, while maintaining focus on reliability through extensive test/formatting fixes. These efforts collectively increase security, developer productivity, and platform extensibility, enabling faster delivery of features to customers.
31 Commits • 16 Features
Feb 1, 2025February 2025 — Horizon Wallet delivered security hardening, UX improvements, and foundational services across the UnspendableLabs/Horizon-Wallet repo. Notable outcomes include enforcing re-auth and password verification for critical settings, robust session-key handling on timeout, and a set of UX enhancements that improve usability. The month introduced foundational KV storage, extension support, and a more streamlined build pipeline with asset minification, while maintaining focus on reliability through extensive test/formatting fixes. These efforts collectively increase security, developer productivity, and platform extensibility, enabling faster delivery of features to customers.
February 2025
January 2025
81 Commits • 20 Features
Jan 1, 2025January 2025 performance highlights for Horizon-Wallet (UnspendableLabs). Delivered substantial user-facing features, security improvements, and code quality gains, with a focus on transaction control, passwordless workflows, and maintainability. Key outcomes include end-to-end Replace-by-Fee (RBF) UI delivery, a comprehensive passwordless core workflow with dispenser lifecycle, richer passwordless address handling, and foundational observability and security improvements. The work emphasizes business value through safer, more controllable transactions, stronger authentication flows, and a more maintainable codebase.
January 2025
81 Commits • 20 Features
Jan 1, 2025January 2025 performance highlights for Horizon-Wallet (UnspendableLabs). Delivered substantial user-facing features, security improvements, and code quality gains, with a focus on transaction control, passwordless workflows, and maintainability. Key outcomes include end-to-end Replace-by-Fee (RBF) UI delivery, a comprehensive passwordless core workflow with dispenser lifecycle, richer passwordless address handling, and foundational observability and security improvements. The work emphasizes business value through safer, more controllable transactions, stronger authentication flows, and a more maintainable codebase.
December 2024
8 Commits • 7 Features
Dec 1, 2024December 2024: Horizon-Wallet delivered security-focused key management enhancements, signing flexibility, extension-based workflows, and UX/build improvements, including analytics migration to PostHog for better product insights and maintainability.
8 Commits • 7 Features
Dec 1, 2024December 2024: Horizon-Wallet delivered security-focused key management enhancements, signing flexibility, extension-based workflows, and UX/build improvements, including analytics migration to PostHog for better product insights and maintainability.
December 2024
November 2024
93 Commits • 28 Features
Nov 1, 2024Month: 2024-11 — Horizon-Wallet delivered a focused set of platform improvements, feature scaffolding, and reliability work across wallet and browser-extension components, driving reliability, performance, and business value. Key architecture and API work established a stronger foundation for the order flow, asset management, and transaction handling, while CI/test stabilization and versioning groundwork improve upgrade safety and developer velocity.
November 2024
93 Commits • 28 Features
Nov 1, 2024Month: 2024-11 — Horizon-Wallet delivered a focused set of platform improvements, feature scaffolding, and reliability work across wallet and browser-extension components, driving reliability, performance, and business value. Key architecture and API work established a stronger foundation for the order flow, asset management, and transaction handling, while CI/test stabilization and versioning groundwork improve upgrade safety and developer velocity.
Activity
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Quality Metrics
Correctness86.2%
Maintainability85.8%
Architecture82.4%
Performance80.4%
AI Usage23.0%
Skills & Technologies
Programming Languages
CSSDartFlutterHTMLJavaScriptShellSwiftTypeScriptYAML
Technical Skills
API IntegrationAnalyticsAsset ManagementAsynchronous OperationsAsynchronous ProgrammingBLoCBLoC PatternBackend DevelopmentBackend IntegrationBitcoinBitcoin ProtocolBitcoin Transaction ParsingBitcoinJSBlocBloc Pattern
Repositories Contributed To
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