scroll-tech/ceno
Nov 2024 – Dec 2024
2 Months active
Languages Used
RustAssembly
Technical Skills
Circuit DesignCryptographyRustZero-Knowledge ProofsOptimizationRISC-V
Kimi Wu
PROFILE
Kimi Wu
Leonhart Wu contributed to the scroll-tech/ceno repository by developing and optimizing core features in the ceno_zkvm, focusing on arithmetic consistency and efficiency. He unified signed number handling through a modular refactor, introducing the SignedExtendConfig gadget and centralizing signed representations to reduce sign-related errors in VM arithmetic. In subsequent work, Leonhart optimized the MUL instruction using field operations in Rust, decreasing witness size and instruction lookups to improve proof efficiency. He also enhanced the RISC-V emulator’s arithmetic test suite, consolidating and expanding coverage for edge cases. His work demonstrated depth in circuit design, optimization, and zero-knowledge proof systems.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
3Total
Bugs
0
Commits
3
Features
3
Lines of code
904
Activity Months2
Your Network
18 people
Work History
December 2024
2 Commits • 2 Features
Dec 1, 2024December 2024 Monthly Summary – scroll-tech/ceno Key features delivered - MUL instruction optimization using field operations to reduce witness size: refactor MUL to use field operations inspired by MULH; reduces lookups from 13 to 11 and witnesses from 28 to 25, improving efficiency. Commit: 9c7c71a2d4bcda790f48c0c82f19adddda444ae9. - RISC-V emulator arithmetic testing improvements: consolidates and expands test cases for ADD and SUB, including edge cases like overflow and underflow; improves robustness and clarity of the arithmetic testing suite. Commit: c16387c6c11722487f709f416b510370e37d7e09. Major bugs fixed - None reported this month. Overall impact and accomplishments - Reduced verification workload and resource usage by decreasing witness size and instruction lookups, enabling faster proofs and lower memory usage downstream. - Strengthened arithmetic testing coverage, reducing regression risk and improving maintainability for future optimizer work. - Maintained clear, traceable commits to support faster onboarding and review of future optimizations. Technologies/skills demonstrated - Field-operations-based optimization patterns and witness-geometry awareness. - RISC-V emulator test suite design, edge-case coverage (overflow/underflow), and test consolidation. - Refactoring discipline with minimal risk changes and explicit commit messages.
2 Commits • 2 Features
Dec 1, 2024December 2024 Monthly Summary – scroll-tech/ceno Key features delivered - MUL instruction optimization using field operations to reduce witness size: refactor MUL to use field operations inspired by MULH; reduces lookups from 13 to 11 and witnesses from 28 to 25, improving efficiency. Commit: 9c7c71a2d4bcda790f48c0c82f19adddda444ae9. - RISC-V emulator arithmetic testing improvements: consolidates and expands test cases for ADD and SUB, including edge cases like overflow and underflow; improves robustness and clarity of the arithmetic testing suite. Commit: c16387c6c11722487f709f416b510370e37d7e09. Major bugs fixed - None reported this month. Overall impact and accomplishments - Reduced verification workload and resource usage by decreasing witness size and instruction lookups, enabling faster proofs and lower memory usage downstream. - Strengthened arithmetic testing coverage, reducing regression risk and improving maintainability for future optimizer work. - Maintained clear, traceable commits to support faster onboarding and review of future optimizations. Technologies/skills demonstrated - Field-operations-based optimization patterns and witness-geometry awareness. - RISC-V emulator test suite design, edge-case coverage (overflow/underflow), and test consolidation. - Refactoring discipline with minimal risk changes and explicit commit messages.
December 2024
November 2024
1 Commits • 1 Features
Nov 1, 2024November 2024 (scroll-tech/ceno): Delivered a key feature: Unified Signed Number Handling in ceno_zkvm. Introduced the SignedExtendConfig gadget and centralized signed number representations by updating AssertSignedLtConfig, SignedLtConfig, and MulhInstruction to use a unified handling path. This refactor improves consistency, maintainability, and reduces risk of sign-related errors in VM arithmetic. Commit 99898dce31091d804e9d61b39c8caf5ba875ec80 (Feat/#482 unify signed bit extraction (#515)). No major bugs fixed in this period based on available data. Overall, enhances reliability of numeric operations in the ZK VM and enables safer future feature work. Demonstrated skills: systems programming, low-level VM logic, modular refactoring, and traceable, commit-based changes.
November 2024
1 Commits • 1 Features
Nov 1, 2024November 2024 (scroll-tech/ceno): Delivered a key feature: Unified Signed Number Handling in ceno_zkvm. Introduced the SignedExtendConfig gadget and centralized signed number representations by updating AssertSignedLtConfig, SignedLtConfig, and MulhInstruction to use a unified handling path. This refactor improves consistency, maintainability, and reduces risk of sign-related errors in VM arithmetic. Commit 99898dce31091d804e9d61b39c8caf5ba875ec80 (Feat/#482 unify signed bit extraction (#515)). No major bugs fixed in this period based on available data. Overall, enhances reliability of numeric operations in the ZK VM and enables safer future feature work. Demonstrated skills: systems programming, low-level VM logic, modular refactoring, and traceable, commit-based changes.
Activity
Loading activity data...
Quality Metrics
Correctness90.0%
Maintainability80.0%
Architecture83.4%
Performance83.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
AssemblyRust
Technical Skills
Circuit DesignCryptographyOptimizationRISC-VRISC-V EmulationRustUnit TestingZero-Knowledge Proofs
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline