
Ouziel worked extensively on the CounterpartyXCP/counterparty-core repository, delivering core blockchain features, reliability improvements, and robust test infrastructure over 13 months. He engineered protocol upgrades, asset management enhancements, and advanced transaction handling, leveraging Python and Rust for backend development and performance-critical parsing. His approach emphasized maintainability, introducing modular code, comprehensive test coverage, and CI/CD automation to reduce regressions and accelerate releases. Ouziel addressed data integrity and upgrade safety through migration checkpoints, caching strategies, and error handling improvements. By refining API endpoints, optimizing Docker deployments, and expanding network compatibility, he enabled safer production rollouts and more predictable, scalable blockchain operations.

January 2026 performance summary focusing on stability, reliability, and release-readiness across CounterpartyXCP/counterparty-core and UnspendableLabs/Horizon-Wallet. Delivered notable cache and dependency improvements, expanded test coverage and migrations, and introduced Horizon-Wallet asset description editing with a consistent refactor. Strengthened API stability and error handling, leading to faster releases and more predictable production behavior.
January 2026 performance summary focusing on stability, reliability, and release-readiness across CounterpartyXCP/counterparty-core and UnspendableLabs/Horizon-Wallet. Delivered notable cache and dependency improvements, expanded test coverage and migrations, and introduced Horizon-Wallet asset description editing with a consistent refactor. Strengthened API stability and error handling, leading to faster releases and more predictable production behavior.
November 2025 monthly summary for CounterpartyXCP/counterparty-core: Delivered key burn calculation improvements for Testnet3 and substantial reliability enhancements to testing infrastructure, driving release readiness and network stability. Key features delivered: - Burn calculation improvements for Testnet3: extended burn window, multipliers frozen at legacy cutoff, and introduced XCP earned calculation with supporting tests. (Commits: ce709d38dd9c734a5b95bf8a087414f07d3d9aed; 6ac0d2bf943f1ef53eba26446924aa3c841ab638; d16cd69f1906dc0562380033ca41f054ce2247af; b95f3b6aa4f8c0daa25b77e58bd59f6650810c01) - Reliability and testing infrastructure improvements: version bump to 11.0.4-alpha.1, docker-compose tests, checkpoints, rollback precision, error handling, and ZMQ/RPC notification resilience; RSFetcher restart enhancements, and related tests. (Representative commits: eabbd2b19225347b7c77a8a413534ce329374656; 09329c9b87db72dbf5e1611979093f003e313d98; 86b73b0658c8b0166f9526c630502f04cb996e8b; 8d75c475c6f9159e1505b2ea7f7144fc2cdb4609; e193483123e53133b1cc95273923de88fa94bc81; fd6d8e692ef82d78ef07b362b5cd8a4fb19a9815; cf002ff311f4f387c31b9cca8602f30030e6e3f8; 8666876312c68d0f725d91d445fb3a693fa64b87; faf07388fc19f97057efa3437eef4394f7273c0e; 3f93ef6caec618452e0121eed890eaf166a1ef25) Major bugs fixed: - Stability and release pipeline fixes: RSFetcher restart fix, improved handling for reorg edge cases, and enhanced error messages in assertion paths; RPC/ZMQ notification resilience improvements. (Commits: faf07388fc19f97057efa3437eef4394f7273c0e; cf002ff311f4f387c31b9cca8602f30030e6e3f8; d5445e605ac04c04c321e4dfca5ed8747385e1d4) Overall impact and accomplishments: - Increased release readiness with a clearly versioned release (11.0.4-alpha.1), improved test coverage, and more predictable burn behavior on test networks, reducing release risk and accelerating iteration cycles. Technologies/skills demonstrated: - Test infrastructure hardening, Docker-based CI, testnet/testnet4 checkpoint strategies, error handling, ZMQ/RPC resilience, and release engineering.
November 2025 monthly summary for CounterpartyXCP/counterparty-core: Delivered key burn calculation improvements for Testnet3 and substantial reliability enhancements to testing infrastructure, driving release readiness and network stability. Key features delivered: - Burn calculation improvements for Testnet3: extended burn window, multipliers frozen at legacy cutoff, and introduced XCP earned calculation with supporting tests. (Commits: ce709d38dd9c734a5b95bf8a087414f07d3d9aed; 6ac0d2bf943f1ef53eba26446924aa3c841ab638; d16cd69f1906dc0562380033ca41f054ce2247af; b95f3b6aa4f8c0daa25b77e58bd59f6650810c01) - Reliability and testing infrastructure improvements: version bump to 11.0.4-alpha.1, docker-compose tests, checkpoints, rollback precision, error handling, and ZMQ/RPC notification resilience; RSFetcher restart enhancements, and related tests. (Representative commits: eabbd2b19225347b7c77a8a413534ce329374656; 09329c9b87db72dbf5e1611979093f003e313d98; 86b73b0658c8b0166f9526c630502f04cb996e8b; 8d75c475c6f9159e1505b2ea7f7144fc2cdb4609; e193483123e53133b1cc95273923de88fa94bc81; fd6d8e692ef82d78ef07b362b5cd8a4fb19a9815; cf002ff311f4f387c31b9cca8602f30030e6e3f8; 8666876312c68d0f725d91d445fb3a693fa64b87; faf07388fc19f97057efa3437eef4394f7273c0e; 3f93ef6caec618452e0121eed890eaf166a1ef25) Major bugs fixed: - Stability and release pipeline fixes: RSFetcher restart fix, improved handling for reorg edge cases, and enhanced error messages in assertion paths; RPC/ZMQ notification resilience improvements. (Commits: faf07388fc19f97057efa3437eef4394f7273c0e; cf002ff311f4f387c31b9cca8602f30030e6e3f8; d5445e605ac04c04c321e4dfca5ed8747385e1d4) Overall impact and accomplishments: - Increased release readiness with a clearly versioned release (11.0.4-alpha.1), improved test coverage, and more predictable burn behavior on test networks, reducing release risk and accelerating iteration cycles. Technologies/skills demonstrated: - Test infrastructure hardening, Docker-based CI, testnet/testnet4 checkpoint strategies, error handling, ZMQ/RPC resilience, and release engineering.
October 2025 performance summary for CounterpartyXCP/counterparty-core. Focused on boosting API responsiveness, ensuring data integrity, and strengthening upgrade processes. Notable work included caching improvements for API endpoints and mempool handling, improved caching for asset issuance, corrected data aggregation in earnings/payments/commissions, and a coordinated 11.0.3 release and upgrade configuration across networks. These changes deliver faster, more reliable data for users and smoother upgrade workflows, with expanded test coverage and updated release notes.
October 2025 performance summary for CounterpartyXCP/counterparty-core. Focused on boosting API responsiveness, ensuring data integrity, and strengthening upgrade processes. Notable work included caching improvements for API endpoints and mempool handling, improved caching for asset issuance, corrected data aggregation in earnings/payments/commissions, and a coordinated 11.0.3 release and upgrade configuration across networks. These changes deliver faster, more reliable data for users and smoother upgrade workflows, with expanded test coverage and updated release notes.
August 2025 standout for Counterparty Core: improved reliability, stronger test coverage, and clearer release governance. Resolved critical issuance and broadcast issues, optimized performance paths, and tightened release processes, contributing to safer deployments and faster iteration for partners and users.
August 2025 standout for Counterparty Core: improved reliability, stronger test coverage, and clearer release governance. Resolved critical issuance and broadcast issues, optimized performance paths, and tightened release processes, contributing to safer deployments and faster iteration for partners and users.
June 2025 (CounterpartyXCP/counterparty-core) delivered key network testing capabilities, reliability hardening, and streamlined release governance. The work focused on enabling Signet-based validation, improving core parsing resilience, and ensuring safe upgrade paths to support faster iteration while reducing risk.
June 2025 (CounterpartyXCP/counterparty-core) delivered key network testing capabilities, reliability hardening, and streamlined release governance. The work focused on enabling Signet-based validation, improving core parsing resilience, and ensuring safe upgrade paths to support faster iteration while reducing risk.
May 2025: Delivered core feature enhancements and stability improvements for Counterparty Core, with emphasis on protocol activation, Taproot testing, and release engineering. Strengthened test harnesses and network readiness, enabling smoother mainnet rollouts and faster iteration.
May 2025: Delivered core feature enhancements and stability improvements for Counterparty Core, with emphasis on protocol activation, Taproot testing, and release engineering. Strengthened test harnesses and network readiness, enabling smoother mainnet rollouts and faster iteration.
April 2025 (Counterparty-Core) delivered significant reliability, performance, and observability improvements across the stack. Notable wins include Docker image optimization to Alpine with embedded branch/commit identifiers, CBOR/mime/ordinal encoding enhancements, PyZMQ upgrades for better compatibility, improved logging and API metadata propagation, and POST parameter support in compose routes. A broad set of bug fixes and testing improvements stabilized CI, regression tests, and deployment readiness, enabling faster, safer releases and improved developer productivity.
April 2025 (Counterparty-Core) delivered significant reliability, performance, and observability improvements across the stack. Notable wins include Docker image optimization to Alpine with embedded branch/commit identifiers, CBOR/mime/ordinal encoding enhancements, PyZMQ upgrades for better compatibility, improved logging and API metadata propagation, and POST parameter support in compose routes. A broad set of bug fixes and testing improvements stabilized CI, regression tests, and deployment readiness, enabling faster, safer releases and improved developer productivity.
March 2025 highlights for CounterpartyXCP/counterparty-core: Key features delivered: - Migration checkpoints for mainnet to track upgrade progress and ensure safe, auditable upgrades. - Rust-based address packing/unpacking added with tests to improve address handling and serialization performance. - Encode_data and decode_data methods introduced, enabling robust encoding for enhanced send and sweep flows. - Get Balances By Addresses and Asset to support asset accounting and balance queries across addresses. Major bugs fixed: - Fixed handling of TypeError in API calls to prevent crashes and improve stability. - Correct script_to_address logic to compare migration_hash instead of ledger_hash. - Verbose failure messaging for unpack errors to aid debugging. - DatabaseError handling improvements to avoid crashes and improve stability. Overall impact and accomplishments: - These changes improve upgrade safety, reliability, and data integrity, enabling safer mainnet upgrades and more robust asset/api tooling. Expanded test coverage and quality tooling reduce regression risk and accelerate future development. Technologies/skills demonstrated: - Rust address encoding/decoding and testing; improved test coverage and quality tooling; emphasis on maintainability with release notes and linting.
March 2025 highlights for CounterpartyXCP/counterparty-core: Key features delivered: - Migration checkpoints for mainnet to track upgrade progress and ensure safe, auditable upgrades. - Rust-based address packing/unpacking added with tests to improve address handling and serialization performance. - Encode_data and decode_data methods introduced, enabling robust encoding for enhanced send and sweep flows. - Get Balances By Addresses and Asset to support asset accounting and balance queries across addresses. Major bugs fixed: - Fixed handling of TypeError in API calls to prevent crashes and improve stability. - Correct script_to_address logic to compare migration_hash instead of ledger_hash. - Verbose failure messaging for unpack errors to aid debugging. - DatabaseError handling improvements to avoid crashes and improve stability. Overall impact and accomplishments: - These changes improve upgrade safety, reliability, and data integrity, enabling safer mainnet upgrades and more robust asset/api tooling. Expanded test coverage and quality tooling reduce regression risk and accelerate future development. Technologies/skills demonstrated: - Rust address encoding/decoding and testing; improved test coverage and quality tooling; emphasis on maintainability with release notes and linting.
February 2025 (2025-02) summary for CounterpartyXCP/counterparty-core focusing on delivering business value through stability, testability, and release-readiness. Key features delivered - Test infrastructure and coverage enhancements: overhauled integration test workflow, regenerated/adjusted tests, and migrated pytest to the test/ directory; added a dedicated test for get_assets_last_issuance. (Commits: 424add7b080dede3c192f321654c3a71420559e1; f481b9900cce9dc47aec38277091641b489ba45a; 2f95ffc1b2e29c5f791b38ab03690d782eacbc11; 9080e40628819fd1a43c94ec5d39f8c9533a832a) - Documentation and release notes updates: updated docs, release notes, and test structure to reflect changes; introduced upgrade instructions and improved release notes drift. (Commits: 2f95ffc1b2e29c5f791b38ab03690d782eacbc11; 2139d60198e17dcd08450cd4c12722b6f425a3fb; 9080e40628819fd1a43c94ec5d39f8c9533a832a) - CI/CD and testing infrastructure enhancements: new GitHub workflows, CI timing tweaks, and test automation improvements to increase reliability and faster feedback loops. (Commits: ef6e082c1fdb52feba920e408d5110d15de56216; 3094340d8385c6d992a7377c4e1f7d29aa961d0a) - Load testing capabilities: Locust-based test runner and load-test enhancements, enabling more realistic performance validation of local nodes. (Commits: 2ee50217f40595b3e8a599cbae37f082c1430612; bf82e4906866d0c7d96e017ae86d168e1d19692e) - Python ecosystem modernization: Python 3.12 support and Python 3.13 compatibility cleanup, ensuring broader compatibility and forward-compatibility. (Commits: 4d3fcf5abd81a4a407cb820462d1e29886e40c9c; f625b897facfd04678d350ca2517edb6757a1f49) Major bugs fixed - Do not panic on Rust errors; ensure clean operation without panic (commit 81478db38b019034a930f1dec0fb3ae4fb0526f2) - Return HTTP 400 on TypeError instead of propagating (commit 206757981d8d337fd0ffd743381b28c357262343) - Default UTXO value for Attach should be 546 (commit e9aa391c43c07c4ce3d0dfa5b6219adbbb7bff0e) - Fix search_pubkey_in_transactions and clean debug traces (commit dc95bad9a8199355614d94442d91c1142b64d5c6) - Fix safe_rpc() and related RPC handling issues (commit 49c5cd920492a908354e8504b262ddad756ec877; 4a54c8ef9c6cc264c0b6009a24763e5e9eeb5a3e) - Stabilize tests and CI/test harness issues: fix tests on GitHub CI; edge-case and merge-related fixes (commits: bd4eba81da77713b70c8cf79b8016abaca66455e; dbbe551171141ba75e9c0835086093eea6dcd182; 0a1516d6f74b1c53d2c8b814fcc83e5aa5ece937) Overall impact and accomplishments - Achieved higher reliability and quality of the Counterparty Core suite, enabling faster, safer releases and more predictable production behavior. Ledger and gettxinfo test coverage reached 100% in this cycle, increasing confidence for both developers and operators. (Evidence: ledger module 100% coverage; gettxinfo.py 100% coverage; gettxinfolegacy 100% coverage across commits f883485f98b34cdef16c2e976f6206e99023c4f9; 2e2463fa5e2008ce5454455b53c3aa7b8dc3ef26; 8de8a904f39356b9df0e98ca48fd4b562d982626) - Strengthened release readiness and documentation, with updated release notes, upgrade instructions, and blueprint alignment to support smoother onboarding for customers and partners. - Built scalability and resilience into the development process via enhanced CI/CD pipelines, enabling more reliable builds and faster feedback loops for changes affecting APIs and data flow. - Introduced LoCust-based load testing to validate performance characteristics under realistic load, informing capacity planning and optimization. Technologies, skills demonstrated - Rust and Python back-end hardening: robust error handling, RPC resilience, and safe interactions across language boundaries. - Test automation and coverage engineering: integration tests, unit tests, and full-coverage goals (100% coverage in ledger/gettxinfo paths). - CI/CD, GitHub Actions, and release management: automation pipelines, badges, and release-note hygiene. - Performance testing and load testing: Locust-based load runner and related configuration. - Modern Python ecosystem: Python 3.12 support and Python 3.13 compatibility cleanup; code quality tooling (ruff/pylint) and packaging hygiene. Business value - Reduced risk of production incidents due to better error handling and stability fixes, improving system reliability for counterparties and users. - Faster release cycles and clearer documentation reduce time-to-value for customers and accelerate onboarding. - Stronger test coverage and beter observability support ongoing maintenance and capacity planning.
February 2025 (2025-02) summary for CounterpartyXCP/counterparty-core focusing on delivering business value through stability, testability, and release-readiness. Key features delivered - Test infrastructure and coverage enhancements: overhauled integration test workflow, regenerated/adjusted tests, and migrated pytest to the test/ directory; added a dedicated test for get_assets_last_issuance. (Commits: 424add7b080dede3c192f321654c3a71420559e1; f481b9900cce9dc47aec38277091641b489ba45a; 2f95ffc1b2e29c5f791b38ab03690d782eacbc11; 9080e40628819fd1a43c94ec5d39f8c9533a832a) - Documentation and release notes updates: updated docs, release notes, and test structure to reflect changes; introduced upgrade instructions and improved release notes drift. (Commits: 2f95ffc1b2e29c5f791b38ab03690d782eacbc11; 2139d60198e17dcd08450cd4c12722b6f425a3fb; 9080e40628819fd1a43c94ec5d39f8c9533a832a) - CI/CD and testing infrastructure enhancements: new GitHub workflows, CI timing tweaks, and test automation improvements to increase reliability and faster feedback loops. (Commits: ef6e082c1fdb52feba920e408d5110d15de56216; 3094340d8385c6d992a7377c4e1f7d29aa961d0a) - Load testing capabilities: Locust-based test runner and load-test enhancements, enabling more realistic performance validation of local nodes. (Commits: 2ee50217f40595b3e8a599cbae37f082c1430612; bf82e4906866d0c7d96e017ae86d168e1d19692e) - Python ecosystem modernization: Python 3.12 support and Python 3.13 compatibility cleanup, ensuring broader compatibility and forward-compatibility. (Commits: 4d3fcf5abd81a4a407cb820462d1e29886e40c9c; f625b897facfd04678d350ca2517edb6757a1f49) Major bugs fixed - Do not panic on Rust errors; ensure clean operation without panic (commit 81478db38b019034a930f1dec0fb3ae4fb0526f2) - Return HTTP 400 on TypeError instead of propagating (commit 206757981d8d337fd0ffd743381b28c357262343) - Default UTXO value for Attach should be 546 (commit e9aa391c43c07c4ce3d0dfa5b6219adbbb7bff0e) - Fix search_pubkey_in_transactions and clean debug traces (commit dc95bad9a8199355614d94442d91c1142b64d5c6) - Fix safe_rpc() and related RPC handling issues (commit 49c5cd920492a908354e8504b262ddad756ec877; 4a54c8ef9c6cc264c0b6009a24763e5e9eeb5a3e) - Stabilize tests and CI/test harness issues: fix tests on GitHub CI; edge-case and merge-related fixes (commits: bd4eba81da77713b70c8cf79b8016abaca66455e; dbbe551171141ba75e9c0835086093eea6dcd182; 0a1516d6f74b1c53d2c8b814fcc83e5aa5ece937) Overall impact and accomplishments - Achieved higher reliability and quality of the Counterparty Core suite, enabling faster, safer releases and more predictable production behavior. Ledger and gettxinfo test coverage reached 100% in this cycle, increasing confidence for both developers and operators. (Evidence: ledger module 100% coverage; gettxinfo.py 100% coverage; gettxinfolegacy 100% coverage across commits f883485f98b34cdef16c2e976f6206e99023c4f9; 2e2463fa5e2008ce5454455b53c3aa7b8dc3ef26; 8de8a904f39356b9df0e98ca48fd4b562d982626) - Strengthened release readiness and documentation, with updated release notes, upgrade instructions, and blueprint alignment to support smoother onboarding for customers and partners. - Built scalability and resilience into the development process via enhanced CI/CD pipelines, enabling more reliable builds and faster feedback loops for changes affecting APIs and data flow. - Introduced LoCust-based load testing to validate performance characteristics under realistic load, informing capacity planning and optimization. Technologies, skills demonstrated - Rust and Python back-end hardening: robust error handling, RPC resilience, and safe interactions across language boundaries. - Test automation and coverage engineering: integration tests, unit tests, and full-coverage goals (100% coverage in ledger/gettxinfo paths). - CI/CD, GitHub Actions, and release management: automation pipelines, badges, and release-note hygiene. - Performance testing and load testing: Locust-based load runner and related configuration. - Modern Python ecosystem: Python 3.12 support and Python 3.13 compatibility cleanup; code quality tooling (ruff/pylint) and packaging hygiene. Business value - Reduced risk of production incidents due to better error handling and stability fixes, improving system reliability for counterparties and users. - Faster release cycles and clearer documentation reduce time-to-value for customers and accelerate onboarding. - Stronger test coverage and beter observability support ongoing maintenance and capacity planning.
January 2025 (Month: 2025-01) was a focused sprint on reliability, data quality, and build maturity for CounterpartyXCP/counterparty-core. The team expanded test coverage and stabilized the testing infrastructure, advanced data modeling and query capabilities, improved transaction-fee handling, and began introducing Rust-based parsing for performance and safety. These efforts reduce regressions, shorten incident response times, and support a stable release cycle while enabling richer analytics and safer operations.
January 2025 (Month: 2025-01) was a focused sprint on reliability, data quality, and build maturity for CounterpartyXCP/counterparty-core. The team expanded test coverage and stabilized the testing infrastructure, advanced data modeling and query capabilities, improved transaction-fee handling, and began introducing Rust-based parsing for performance and safety. These efforts reduce regressions, shorten incident response times, and support a stable release cycle while enabling richer analytics and safer operations.
December 2024 — CounterpartyXCP counterparty-core: Delivered key features, fixed critical bugs, and improved reliability, performance, and release discipline. Business value includes more robust transaction chaining and event visibility, enhanced asset API usability, faster and safer UTXO handling, and streamlined deployment. Highlights include stable test fixtures and test infrastructure, reorg and parsing correctness, DER/sighash refinements, UTXO cache and concurrency improvements, checkpoint integration for faster sync, asset-endpoint enrichment, and CI/CD enhancements with release hygiene.
December 2024 — CounterpartyXCP counterparty-core: Delivered key features, fixed critical bugs, and improved reliability, performance, and release discipline. Business value includes more robust transaction chaining and event visibility, enhanced asset API usability, faster and safer UTXO handling, and streamlined deployment. Highlights include stable test fixtures and test infrastructure, reorg and parsing correctness, DER/sighash refinements, UTXO cache and concurrency improvements, checkpoint integration for faster sync, asset-endpoint enrichment, and CI/CD enhancements with release hygiene.
November 2024 focused on delivering business-critical features, strengthening data quality, and improving reliability across Counterparty Core. Key work spanned market data enhancements, minting controls, database performance, and architecture improvements, with significant progress in test stability and CI processes.
November 2024 focused on delivering business-critical features, strengthening data quality, and improving reliability across Counterparty Core. Key work spanned market data enhancements, minting controls, database performance, and architecture improvements, with significant progress in test stability and CI processes.
In Oct 2024, delivered essential testing and reliability improvements for Counterparty Core, enabling safer releases and faster iteration. Key outcomes include testnet4 coverage, maintainability improvements, and test reliability fixes that reduce risk in production deployments.
In Oct 2024, delivered essential testing and reliability improvements for Counterparty Core, enabling safer releases and faster iteration. Key outcomes include testnet4 coverage, maintainability improvements, and test reliability fixes that reduce risk in production deployments.
Overview of all repositories you've contributed to across your timeline