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
Worked on the scroll-tech/ceno repository, focusing on enhancing arithmetic reliability and efficiency in a RISC-V zero-knowledge virtual machine. Delivered a unified signed number handling path by introducing the SignedExtendConfig gadget and refactoring multiple VM components, which improved consistency and reduced sign-related errors. Optimized the MUL instruction using field operations in Rust, decreasing witness size and lookup counts to streamline proof generation. Expanded and consolidated arithmetic test coverage for the emulator, including edge cases like overflow and underflow, to strengthen maintainability and reduce regression risk. Demonstrated skills in circuit design, optimization, and rigorous unit testing throughout the development process.
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 peopleWork 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
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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
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