BitcreditProtocol/E-Bill
Nov 2024 – Jan 2026
15 Months active
Languages Used
PythonRustShellTypeScriptDockerfileJSONJavaScriptMarkdown
Technical Skills
API DesignAPI DevelopmentAsyncAsync ProgrammingBackend DevelopmentBitcoin
Mario Zupan
PROFILE
Mario Zupan
Mario developed and maintained the BitcreditProtocol/E-Bill platform over 15 months, delivering 55 features and addressing core reliability issues. He architected modular backend systems in Rust and TypeScript, focusing on blockchain integration, secure identity management, and robust bill processing workflows. His work included API design, asynchronous programming, and data modeling to support features like minting, file uploads, and recourse actions, while ensuring data integrity and compliance. Mario implemented persistent storage with SurrealDB, enhanced error handling, and automated WASM release pipelines. His engineering approach emphasized maintainability, test coverage, and scalability, resulting in a resilient, production-ready system for digital bill management.
Overall Statistics
Feature vs Bugs
86%Features
Repository Contributions
122Total
Bugs
9
Commits
122
Features
55
Lines of code
206,100
Activity Months15
Your Network
8 people
Work History
January 2026
4 Commits • 1 Features
Jan 1, 2026January 2026 (2026-01) monthly summary for BitcreditProtocol/E-Bill. Focused on reliability, stability, and correct minting workflow to support dependable mainnet usage and future feature delivery.
4 Commits • 1 Features
Jan 1, 2026January 2026 (2026-01) monthly summary for BitcreditProtocol/E-Bill. Focused on reliability, stability, and correct minting workflow to support dependable mainnet usage and future feature delivery.
January 2026
December 2025
3 Commits • 1 Features
Dec 1, 2025December 2025: Delivered Signatory and Identity Management Enhancements for BitcreditProtocol/E-Bill, consolidating duplicate prevention, last-signatory protection, identity chain fixes, and updates to file upload flows to use company keys. Introduced a new capability to fetch proof of registration files for companies, and deployed a validation hardening hotfix to strengthen signatory validation and identity handling. These changes reduce onboarding risk, improve data integrity, and strengthen compliance across corporate document workflows.
December 2025
3 Commits • 1 Features
Dec 1, 2025December 2025: Delivered Signatory and Identity Management Enhancements for BitcreditProtocol/E-Bill, consolidating duplicate prevention, last-signatory protection, identity chain fixes, and updates to file upload flows to use company keys. Introduced a new capability to fetch proof of registration files for companies, and deployed a validation hardening hotfix to strengthen signatory validation and identity handling. These changes reduce onboarding risk, improve data integrity, and strengthen compliance across corporate document workflows.
November 2025
1 Commits • 1 Features
Nov 1, 2025Month: 2025-11 — BitcreditProtocol/E-Bill delivered a focused improvement to service reliability by implementing unified ValidationError-based error handling across services. The refactor consolidates disparate error types into a single ValidationError enum and aligns error propagation and handling logic, improving consistency, observability, and maintainability. This work reduces triage time, standardizes error reporting, and simplifies onboarding for future features.
1 Commits • 1 Features
Nov 1, 2025Month: 2025-11 — BitcreditProtocol/E-Bill delivered a focused improvement to service reliability by implementing unified ValidationError-based error handling across services. The refactor consolidates disparate error types into a single ValidationError enum and aligns error propagation and handling logic, improving consistency, observability, and maintainability. This work reduces triage time, standardizes error reporting, and simplifies onboarding for future features.
November 2025
October 2025
14 Commits • 5 Features
Oct 1, 2025Month: 2025-10 — BitcreditProtocol/E-Bill monthly summary focusing on delivering business value through robust data handling, reliability, and maintainability. Key features delivered include Nostr-based Recourse and Contact Reliability with broader reach beyond the contact book, Bill Action Rules and Deadlines with validation, Data Modeling and Currency Enhancements for standardized data types and currency handling, Bill History Endpoint and Anonymous Recourse to improve access to historical data and enable recourse without identity, and Maintenance/Documentation/Library Upgrades to stabilize the stack and improve developer experience. Key features delivered: - Nostr-based Recourse and Contact Reliability: Enables bill recourse for recoursees not in the contact book by leveraging Nostr contact details and enhances contact publishing/connection stability with Nostr. Commits involved: 7a474927b6ba99bd2c91ec798c421524f0b8e97f; 9b904a772c9d66b39f88545e3dbacdc89dd5b1c5; 86cc2cdeb90e7fb40bac3db1a14d04fb34d8e2c8 - Bill Action Rules and Deadlines with Validation: Adds explicit deadlines for bill actions (acceptance, payment, buying, recourse) and enhances validation for permissible actions, including edge cases. Commits involved: b0ddc041753d63e26f536648faaad6eca52fe953; 5a6697a528773a3d7d482d5c95b835fc277ee13d; 8dc250af4935c49b5ef27c1de1e080c580b9088c - Data Modeling and Currency Enhancements: Introduces new core data types (address, city, email, identification, name, zip) and standardizes currency representation; updates error handling for validation. Commits involved: 923ac6e10631f596d611804a70f412073017bb47; ed11ac538e4765eb199fe7c6286d1c443c06e2c6; 18295eddc5d484d825f5f5afa527b2d9131a3108 - Bill History Endpoint and Anonymous Recourse: Adds a new endpoint to fetch bill history and refactors to allow anonymous users to recourse, improving transaction history access. Commit involved: a5ae89bf226b71244a2b3a228d883301b5ef9171 - Maintenance, Documentation, and Library Upgrades: Consolidates maintenance work: dependency upgrades (cashu/bcr-common/Wallet-Core), API documentation improvements, API versioning, and changelog updates. Commits involved: e240eddec90d3321b229d73f2de66832ccce5cc8; 81358df7388a8adc1b6c75e469f70ca11cea8e0e; 17567ad2174a081fd6af42d21d8ca2125bf78e4f; 762d95ccc5ca45390d93c15a9cc16afd9061438d Major bugs fixed: - Async Nostr init: Fix publish contact in async Nostr init (#686) - Transports: Fix Harness and connect new Company Transports (#689) - Edge-case handling: Fix req to recourse for payer is holder situations (#694) - Type validation: Fix URL TS types (#696) Overall impact and accomplishments: - Expanded recourse reach and reliability by enabling non-contact book participants to engage in recourse via Nostr, improving user coverage and trust. - Strengthened data integrity and interoperability with standardized data types and currency representations, reducing validation errors and integration friction. - Improved user access to historical actions through a dedicated Bill History endpoint and by enabling anonymous recourse, enhancing transparency and compliance readiness. - Elevated developer experience and project stability through ongoing maintenance, upgrades, and thorough documentation, supporting faster iteration and safer releases. Technologies/skills demonstrated: - Nostr integration and asynchronous initialization patterns, including transport wiring and reliability improvements. - Data modeling with new core types and Sum/Currency representations, plus validation frameworks. - API design improvements: Bill History endpoint, endpoints for anonymous recourse, and versioning/docs enhancements. - Maintenance automation: dependency upgrades, changelog generation, and documentation best practices. Business value: - Faster time-to-value for recourse features, larger addressable user base for recourse flows, and safer, more scalable data handling and API surfaces for future enhancements.
October 2025
14 Commits • 5 Features
Oct 1, 2025Month: 2025-10 — BitcreditProtocol/E-Bill monthly summary focusing on delivering business value through robust data handling, reliability, and maintainability. Key features delivered include Nostr-based Recourse and Contact Reliability with broader reach beyond the contact book, Bill Action Rules and Deadlines with validation, Data Modeling and Currency Enhancements for standardized data types and currency handling, Bill History Endpoint and Anonymous Recourse to improve access to historical data and enable recourse without identity, and Maintenance/Documentation/Library Upgrades to stabilize the stack and improve developer experience. Key features delivered: - Nostr-based Recourse and Contact Reliability: Enables bill recourse for recoursees not in the contact book by leveraging Nostr contact details and enhances contact publishing/connection stability with Nostr. Commits involved: 7a474927b6ba99bd2c91ec798c421524f0b8e97f; 9b904a772c9d66b39f88545e3dbacdc89dd5b1c5; 86cc2cdeb90e7fb40bac3db1a14d04fb34d8e2c8 - Bill Action Rules and Deadlines with Validation: Adds explicit deadlines for bill actions (acceptance, payment, buying, recourse) and enhances validation for permissible actions, including edge cases. Commits involved: b0ddc041753d63e26f536648faaad6eca52fe953; 5a6697a528773a3d7d482d5c95b835fc277ee13d; 8dc250af4935c49b5ef27c1de1e080c580b9088c - Data Modeling and Currency Enhancements: Introduces new core data types (address, city, email, identification, name, zip) and standardizes currency representation; updates error handling for validation. Commits involved: 923ac6e10631f596d611804a70f412073017bb47; ed11ac538e4765eb199fe7c6286d1c443c06e2c6; 18295eddc5d484d825f5f5afa527b2d9131a3108 - Bill History Endpoint and Anonymous Recourse: Adds a new endpoint to fetch bill history and refactors to allow anonymous users to recourse, improving transaction history access. Commit involved: a5ae89bf226b71244a2b3a228d883301b5ef9171 - Maintenance, Documentation, and Library Upgrades: Consolidates maintenance work: dependency upgrades (cashu/bcr-common/Wallet-Core), API documentation improvements, API versioning, and changelog updates. Commits involved: e240eddec90d3321b229d73f2de66832ccce5cc8; 81358df7388a8adc1b6c75e469f70ca11cea8e0e; 17567ad2174a081fd6af42d21d8ca2125bf78e4f; 762d95ccc5ca45390d93c15a9cc16afd9061438d Major bugs fixed: - Async Nostr init: Fix publish contact in async Nostr init (#686) - Transports: Fix Harness and connect new Company Transports (#689) - Edge-case handling: Fix req to recourse for payer is holder situations (#694) - Type validation: Fix URL TS types (#696) Overall impact and accomplishments: - Expanded recourse reach and reliability by enabling non-contact book participants to engage in recourse via Nostr, improving user coverage and trust. - Strengthened data integrity and interoperability with standardized data types and currency representations, reducing validation errors and integration friction. - Improved user access to historical actions through a dedicated Bill History endpoint and by enabling anonymous recourse, enhancing transparency and compliance readiness. - Elevated developer experience and project stability through ongoing maintenance, upgrades, and thorough documentation, supporting faster iteration and safer releases. Technologies/skills demonstrated: - Nostr integration and asynchronous initialization patterns, including transport wiring and reliability improvements. - Data modeling with new core types and Sum/Currency representations, plus validation frameworks. - API design improvements: Bill History endpoint, endpoints for anonymous recourse, and versioning/docs enhancements. - Maintenance automation: dependency upgrades, changelog generation, and documentation best practices. Business value: - Faster time-to-value for recourse features, larger addressable user base for recourse flows, and safer, more scalable data handling and API surfaces for future enhancements.
September 2025
11 Commits • 5 Features
Sep 1, 2025September 2025 performance summary for BitcreditProtocol/E-Bill: Delivered a set of user-facing features and foundational capabilities that enhance bill event visibility, identity linkage, and recourse workflows, while upgrading tooling to support ongoing development. Key features delivered include: - Email Notification System: end-to-end capability with an API to register/manage alerts, persistent storage, frontend exposure via WASM, and defined payload formats. - Identity Proofs Management: foundational system for linking social identities to accounts, including creation, verification, persistence, and blocks; includes identity proof URL validation via a Nostr relay. - Anonymous Bill Recourse: enables anonymous participants to initiate recourse actions by updating data structures and validation logic. - Billing Results Timestamping: adds last_block_time timestamp to bill results for ordering and performance insights; updates to related result structures and endpoints (e.g., light bills endpoint). - Maintenance: Tooling & Documentation: updated WASM toolchain installation URL in CI, adjusted toolchain references, and changelog note for the new sync_bill_chain API. Overall impact and accomplishments: - Business value: improved proactive communication to users, stronger auditability of bill results, and support for identity-linked workflows. Anonymous recourse provides a privacy-preserving pathway for dispute resolution. - Technical achievements: end-to-end API design, WASM integration, proxy-based identity proof URL checks, data structure migrations, and CI/tooling modernization. - Skills demonstrated: backend API development, distributed identity concepts, data modeling, and CI/CD automation.
11 Commits • 5 Features
Sep 1, 2025September 2025 performance summary for BitcreditProtocol/E-Bill: Delivered a set of user-facing features and foundational capabilities that enhance bill event visibility, identity linkage, and recourse workflows, while upgrading tooling to support ongoing development. Key features delivered include: - Email Notification System: end-to-end capability with an API to register/manage alerts, persistent storage, frontend exposure via WASM, and defined payload formats. - Identity Proofs Management: foundational system for linking social identities to accounts, including creation, verification, persistence, and blocks; includes identity proof URL validation via a Nostr relay. - Anonymous Bill Recourse: enables anonymous participants to initiate recourse actions by updating data structures and validation logic. - Billing Results Timestamping: adds last_block_time timestamp to bill results for ordering and performance insights; updates to related result structures and endpoints (e.g., light bills endpoint). - Maintenance: Tooling & Documentation: updated WASM toolchain installation URL in CI, adjusted toolchain references, and changelog note for the new sync_bill_chain API. Overall impact and accomplishments: - Business value: improved proactive communication to users, stronger auditability of bill results, and support for identity-linked workflows. Anonymous recourse provides a privacy-preserving pathway for dispute resolution. - Technical achievements: end-to-end API design, WASM integration, proxy-based identity proof URL checks, data structure migrations, and CI/tooling modernization. - Skills demonstrated: backend API development, distributed identity concepts, data modeling, and CI/CD automation.
September 2025
August 2025
1 Commits • 1 Features
Aug 1, 2025In August 2025, delivered Identity and Bill Recovery for BitcreditProtocol/E-Bill, enabling recoveries for personal identities, company identities, and associated bills. This feature enhances user self-service, reduces recovery-related downtime, and strengthens compliance around identity lifecycle management. The change is documented in the CHANGELOG, reflecting the new capability. No major bugs fixed this month; focus was on feature delivery and documentation to prepare for release readiness.
August 2025
1 Commits • 1 Features
Aug 1, 2025In August 2025, delivered Identity and Bill Recovery for BitcreditProtocol/E-Bill, enabling recoveries for personal identities, company identities, and associated bills. This feature enhances user self-service, reduces recovery-related downtime, and strengthens compliance around identity lifecycle management. The change is documented in the CHANGELOG, reflecting the new capability. No major bugs fixed this month; focus was on feature delivery and documentation to prepare for release readiness.
July 2025
5 Commits • 2 Features
Jul 1, 2025Monthly work summary for 2025-07 focused on enabling Wildcat deployment readiness and delivering key improvements in E-Bill API, file handling, and data validation for BitcreditProtocol/E-Bill. The month delivered measurable business value through API payload restructuring, enhanced file management capabilities, and stricter validation rules, resulting in more reliable minting workflows and scalable attachment handling across identities, contacts, and bills.
5 Commits • 2 Features
Jul 1, 2025Monthly work summary for 2025-07 focused on enabling Wildcat deployment readiness and delivering key improvements in E-Bill API, file handling, and data validation for BitcreditProtocol/E-Bill. The month delivered measurable business value through API payload restructuring, enhanced file management capabilities, and stricter validation rules, resulting in more reliable minting workflows and scalable attachment handling across identities, contacts, and bills.
July 2025
June 2025
11 Commits • 6 Features
Jun 1, 2025June 2025 achievements for BitcreditProtocol/E-Bill focused on security, reliability, and performance gains translating into stronger data integrity and faster releases. Key work included Blossom Nostr client integration with file upload/download and a persistent HTTP Bitcoin client for lower latency; identity-scoped bill caching to prevent cross-identity data conflicts; an identifier system overhaul introducing typed IDs (NodeId, PublicKey, SecretKey) and a robust BillId; E-Bill token v4 migration with keyset integration and a plaintext_hash field for data integrity; and CI improvements with cargo-deny checks and a 0.4.0 release bump. Additional hardening included per-requester mint isolation tests and network validity checks for IDs to prevent misuse.
June 2025
11 Commits • 6 Features
Jun 1, 2025June 2025 achievements for BitcreditProtocol/E-Bill focused on security, reliability, and performance gains translating into stronger data integrity and faster releases. Key work included Blossom Nostr client integration with file upload/download and a persistent HTTP Bitcoin client for lower latency; identity-scoped bill caching to prevent cross-identity data conflicts; an identifier system overhaul introducing typed IDs (NodeId, PublicKey, SecretKey) and a robust BillId; E-Bill token v4 migration with keyset integration and a plaintext_hash field for data integrity; and CI improvements with cargo-deny checks and a 0.4.0 release bump. Additional hardening included per-requester mint isolation tests and network validity checks for IDs to prevent misuse.
May 2025
11 Commits • 5 Features
May 1, 2025May 2025: Delivered high-impact features, reliability fixes, and workspace hygiene improvements for BitcreditProtocol/E-Bill. Focus areas included robust minting workflow with offers, keysets, proofs, and persistent recovery data, plus tests to cover these scenarios; anonymous participants support across bill endorsements, minting, and offers; testnet explorer URL configuration updates; MIT license standardization across crates; and workspace-wide metadata consolidation to ensure consistency. Targeted fixes improved stability for WASM SurrealDB usage and frontend/Rust API alignment. These changes enhance security, privacy, developer productivity, and operational efficiency, delivering tangible business value through more reliable minting, privacy options, reduced maintenance overhead, and clearer licensing and configuration practices.
11 Commits • 5 Features
May 1, 2025May 2025: Delivered high-impact features, reliability fixes, and workspace hygiene improvements for BitcreditProtocol/E-Bill. Focus areas included robust minting workflow with offers, keysets, proofs, and persistent recovery data, plus tests to cover these scenarios; anonymous participants support across bill endorsements, minting, and offers; testnet explorer URL configuration updates; MIT license standardization across crates; and workspace-wide metadata consolidation to ensure consistency. Targeted fixes improved stability for WASM SurrealDB usage and frontend/Rust API alignment. These changes enhance security, privacy, developer productivity, and operational efficiency, delivering tangible business value through more reliable minting, privacy options, reduced maintenance overhead, and clearer licensing and configuration practices.
May 2025
April 2025
13 Commits • 4 Features
Apr 1, 2025April 2025 monthly performance for BitcreditProtocol/E-Bill focused on robustness, API improvements, and improved development/testing. Delivered comprehensive bill processing validation and security hardening, expanded bill state visibility through API enhancements, and strengthened the development/testing environment. This period also included release hygiene improvements to support safer, versioned releases and clearer documentation.
April 2025
13 Commits • 4 Features
Apr 1, 2025April 2025 monthly performance for BitcreditProtocol/E-Bill focused on robustness, API improvements, and improved development/testing. Delivered comprehensive bill processing validation and security hardening, expanded bill state visibility through API enhancements, and strengthened the development/testing environment. This period also included release hygiene improvements to support safer, versioned releases and clearer documentation.
March 2025
6 Commits • 4 Features
Mar 1, 2025March 2025 highlights: Delivered end-to-end WASM release automation for BitcreditProtocol/E-Bill, enabling automated build, tagging, release and npm publication via the new wasm_release workflow and asset renaming. Completed Bill Model Refactor with granular states and performance improvements, including caching and enhanced logs. Implemented Persistent Identity Persistence and WASM Storage Refactor to ensure active identity persists across sessions and optimized IndexedDB usage. Refactored File Upload workflow, bumped version to 0.3.2, and added detailed debug logging. These efforts reduce time-to-release, improve reliability of wasm artifacts, and strengthen data integrity and observability. Key achievements are organized around four deliverables:
6 Commits • 4 Features
Mar 1, 2025March 2025 highlights: Delivered end-to-end WASM release automation for BitcreditProtocol/E-Bill, enabling automated build, tagging, release and npm publication via the new wasm_release workflow and asset renaming. Completed Bill Model Refactor with granular states and performance improvements, including caching and enhanced logs. Implemented Persistent Identity Persistence and WASM Storage Refactor to ensure active identity persists across sessions and optimized IndexedDB usage. Refactored File Upload workflow, bumped version to 0.3.2, and added detailed debug logging. These efforts reduce time-to-release, improve reliability of wasm artifacts, and strengthen data integrity and observability. Key achievements are organized around four deliverables:
March 2025
February 2025
17 Commits • 12 Features
Feb 1, 2025February 2025 performance snapshot for BitcreditProtocol/E-Bill focused on delivering key business value through network configurability, cross-identity visibility, and robust bill processing while laying groundwork for future features. Highlights include the introduction of network configurability for Bitcoin with a dedicated flag and a sensible testnet default; a new Bill API endpoint to retrieve all local bills across identities; a modular refactor of the bill service (payment, propagation, validation) with improved timeouts and action handling; a refactor of the DHT-based bill find/sync path to streamline blockchain data synchronization; and SAT-to-BTC conversion for bill payments with timestamps in light bills and improved maturity/drawing timestamps. Major bug fix during the month addressed the payee overwrite issue where the endorsee could override the intended recipient, ensuring the payee remains correct across flows. In addition, progress supported broader improvements like endorsements planning, API/frontend routing alignment, and modernization groundwork for Rust 2024 and multi-crate architecture.
February 2025
17 Commits • 12 Features
Feb 1, 2025February 2025 performance snapshot for BitcreditProtocol/E-Bill focused on delivering key business value through network configurability, cross-identity visibility, and robust bill processing while laying groundwork for future features. Highlights include the introduction of network configurability for Bitcoin with a dedicated flag and a sensible testnet default; a new Bill API endpoint to retrieve all local bills across identities; a modular refactor of the bill service (payment, propagation, validation) with improved timeouts and action handling; a refactor of the DHT-based bill find/sync path to streamline blockchain data synchronization; and SAT-to-BTC conversion for bill payments with timestamps in light bills and improved maturity/drawing timestamps. Major bug fix during the month addressed the payee overwrite issue where the endorsee could override the intended recipient, ensuring the payee remains correct across flows. In addition, progress supported broader improvements like endorsements planning, API/frontend routing alignment, and modernization groundwork for Rust 2024 and multi-crate architecture.
January 2025
18 Commits • 3 Features
Jan 1, 2025January 2025 – BitcreditProtocol/E-Bill: Implemented a company-centric blockchain and bill issuance model, enhanced bill lifecycle, improved DHT resilience, and decoupled frontend deployment for flexible deployments. Delivered data migration to SurrealDB and introduced robust security measures for sensitive company data.
18 Commits • 3 Features
Jan 1, 2025January 2025 – BitcreditProtocol/E-Bill: Implemented a company-centric blockchain and bill issuance model, enhanced bill lifecycle, improved DHT resilience, and decoupled frontend deployment for flexible deployments. Delivered data migration to SurrealDB and introduced robust security measures for sensitive company data.
January 2025
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for BitcreditProtocol/E-Bill focusing on strengthening DHT service resiliency and modernizing the data layer.
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for BitcreditProtocol/E-Bill focusing on strengthening DHT service resiliency and modernizing the data layer.
November 2024
6 Commits • 4 Features
Nov 1, 2024November 2024 highlights focused on delivering a more scalable, modular platform for bill processing and identity management, while tightening architecture and test coverage. Major efforts centered on modernizing the bill pipeline, modularizing identity operations, and refining the file-upload workflow across related services. A new DHT terminal client module was extracted to improve maintainability and configurability.
6 Commits • 4 Features
Nov 1, 2024November 2024 highlights focused on delivering a more scalable, modular platform for bill processing and identity management, while tightening architecture and test coverage. Major efforts centered on modernizing the bill pipeline, modularizing identity operations, and refining the file-upload workflow across related services. A new DHT terminal client module was extracted to improve maintainability and configurability.
November 2024
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Quality Metrics
Correctness88.6%
Maintainability86.0%
Architecture86.0%
Performance78.8%
AI Usage22.2%
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Technical Skills
API DesignAPI DevelopmentAPI IntegrationAPI RefactoringAPI developmentAsyncAsync ProgrammingAsynchronous ProgrammingAutomationBackend DevelopmentBitcoinBlockchainBlockchain DevelopmentBlockchain IntegrationBlockchain Technology
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