scroll-tech/ceno
Jun 2025 – Apr 2026
6 Months active
Languages Used
AssemblyRustPython
Technical Skills
Circuit BuildingCryptographyGKR ProtocolProtocol DesignRust ProgrammingSumcheck Protocol
Tianyi Liu
PROFILE
Tianyi Liu
Tianyi Liu developed advanced cryptographic infrastructure for the scroll-tech/ceno repository, focusing on zero-knowledge proof protocols and elliptic curve operations. Over six months, Tianyi implemented features such as GKR IOP protocol groundwork, Weierstrass elliptic curve support in zkVM, and precompiled arithmetic for BN254 and Uint256. Using Rust and Python, Tianyi designed modular circuit components, integrated selector logic for dynamic constraint evaluation, and enhanced system performance with benchmarking and CI/CD improvements. The work demonstrated depth in protocol design, backend development, and cryptographic primitives, resulting in a maintainable, scalable codebase that supports efficient, verifiable computations for cryptographic applications.
Overall Statistics
Feature vs Bugs
83%Features
Repository Contributions
9Total
Bugs
1
Commits
9
Features
5
Lines of code
22,055
Activity Months6
Your Network
18 peopleWork History
April 2026
1 Commits
Apr 1, 2026April 2026 monthly summary for scroll-tech/ceno: Focused codebase cleanup to remove an unused n_challenges field and its plumbing across Layer, Chip, and GKRCircuit, eliminating dead code and clarifying the data model. No behavioral changes; groundwork laid for future challenge-related features.
1 Commits
Apr 1, 2026April 2026 monthly summary for scroll-tech/ceno: Focused codebase cleanup to remove an unused n_challenges field and its plumbing across Layer, Chip, and GKRCircuit, eliminating dead code and clarifying the data model. No behavioral changes; groundwork laid for future challenge-related features.
April 2026
January 2026
2 Commits • 1 Features
Jan 1, 2026In 2026-01, delivered cryptographic performance enhancements for scroll-tech/ceno by introducing precompiled BN254 finite field operations (addition and multiplication) and a SHA256 extend precompile, paired with targeted tests and interface adjustments to support efficient zkVM execution. This work focuses on performance and throughput improvements for cryptographic primitives used in zk proofs and multi-party computation pipelines.
January 2026
2 Commits • 1 Features
Jan 1, 2026In 2026-01, delivered cryptographic performance enhancements for scroll-tech/ceno by introducing precompiled BN254 finite field operations (addition and multiplication) and a SHA256 extend precompile, paired with targeted tests and interface adjustments to support efficient zkVM execution. This work focuses on performance and throughput improvements for cryptographic primitives used in zk proofs and multi-party computation pipelines.
November 2025
1 Commits • 1 Features
Nov 1, 2025Month: 2025-11 — Summary: Delivered Uint256 multiplication precompile support for scroll-tech/ceno, enabling efficient large-integer multiplications for smart contracts and cryptographic operations. Work included syscall handling, new utility functions, and seamless integration into the existing precompile/VM path. This milestone enhances developer capabilities and can reduce compute costs for relevant workloads. Major bugs: No major bugs reported in this period; primary focus was feature delivery and clean integration. Impact and accomplishments: The new precompile expands the platform's arithmetic capabilities, enabling use-cases that rely on Uint256 math and cryptographic primitives. Cross-team collaboration with gkr-backend to provide supporting utilities (PR #14) established end-to-end functionality and aligns with roadmap goals. The work lays groundwork for future optimizations and broader adoption of Uint256 operations across dApps. Technologies/skills demonstrated: Systems programming (precompile integration, syscall handling), cross-repo collaboration and PR workflow, code quality and maintainability (co-authored commits), and architecture-level changes to VM/precompile path. Notable commit includes 075d900d655311f40992f4331da8f749521f4c14 – Add Uint256 mul precompile support. (#1089) Co-authored-by contributions highlighted in the commit message.
1 Commits • 1 Features
Nov 1, 2025Month: 2025-11 — Summary: Delivered Uint256 multiplication precompile support for scroll-tech/ceno, enabling efficient large-integer multiplications for smart contracts and cryptographic operations. Work included syscall handling, new utility functions, and seamless integration into the existing precompile/VM path. This milestone enhances developer capabilities and can reduce compute costs for relevant workloads. Major bugs: No major bugs reported in this period; primary focus was feature delivery and clean integration. Impact and accomplishments: The new precompile expands the platform's arithmetic capabilities, enabling use-cases that rely on Uint256 math and cryptographic primitives. Cross-team collaboration with gkr-backend to provide supporting utilities (PR #14) established end-to-end functionality and aligns with roadmap goals. The work lays groundwork for future optimizations and broader adoption of Uint256 operations across dApps. Technologies/skills demonstrated: Systems programming (precompile integration, syscall handling), cross-repo collaboration and PR workflow, code quality and maintainability (co-authored commits), and architecture-level changes to VM/precompile path. Notable commit includes 075d900d655311f40992f4331da8f749521f4c14 – Add Uint256 mul precompile support. (#1089) Co-authored-by contributions highlighted in the commit message.
November 2025
October 2025
2 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary for repository scroll-tech/ceno: Implemented Weierstrass Elliptic Curve support in zkVM, including precompiles for EC addition and doubling across BN254, BLS12-381, Secp256k1, and Secp256r1, and added a Weierstrass decompress circuit for Secp256k1 and Secp256r1. This work also introduced new syscalls, updates to precompile/circuit logic and dependencies, and CI/workflow improvements with benchmark testing. These changes expand cryptographic capabilities, improve runtime efficiency, and strengthen end-to-end testing and release readiness. Technology emphasis: zkVM, elliptic curves, precompiles, decompress circuits, CI/CD, benchmarking, dependency management.
October 2025
2 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary for repository scroll-tech/ceno: Implemented Weierstrass Elliptic Curve support in zkVM, including precompiles for EC addition and doubling across BN254, BLS12-381, Secp256k1, and Secp256r1, and added a Weierstrass decompress circuit for Secp256k1 and Secp256r1. This work also introduced new syscalls, updates to precompile/circuit logic and dependencies, and CI/workflow improvements with benchmark testing. These changes expand cryptographic capabilities, improve runtime efficiency, and strengthen end-to-end testing and release readiness. Technology emphasis: zkVM, elliptic curves, precompiles, decompress circuits, CI/CD, benchmarking, dependency management.
July 2025
1 Commits • 1 Features
Jul 1, 2025Month: 2025-07. Focused on delivering core ZK protocol enhancements in the scroll-tech/ceno repository, with a feature that adds selector logic to the GKR IOP and related Keccak precompile improvements. This work enhances flexibility, correctness, and performance of constraint application within the zero-knowledge proof system, enabling more robust and scalable proofs for applications relying on GKR-based proofs.
1 Commits • 1 Features
Jul 1, 2025Month: 2025-07. Focused on delivering core ZK protocol enhancements in the scroll-tech/ceno repository, with a feature that adds selector logic to the GKR IOP and related Keccak precompile improvements. This work enhances flexibility, correctness, and performance of constraint application within the zero-knowledge proof system, enabling more robust and scalable proofs for applications relying on GKR-based proofs.
July 2025
June 2025
2 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary focused on delivering foundational cryptographic circuit infrastructure and preparing for scalable, verifiable computations in scroll-tech/ceno. Key groundwork enables future protocol enhancements and faster delivery of secure circuit constructions. Impact highlights: - Establishes a concrete path toward the GKR IOP protocol for cryptographic circuit construction with frontend and backend implementations and a robust Chip structure to orchestrate commit and GKR phases. - Introduces EvalExpression to support in-phase computations, enabling richer circuit evaluation without destabilizing the pipeline. - Strengthens correctness and robustness of the verification path through rotation verifier enhancements, refined selector formulas, and improved gkr_witness handling. - Demonstrated end-to-end progress with committed groundwork (frontend/backend for circuit building) and verifier improvements, aligning with a modular, maintainable architecture for subsequent feature work.
June 2025
2 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary focused on delivering foundational cryptographic circuit infrastructure and preparing for scalable, verifiable computations in scroll-tech/ceno. Key groundwork enables future protocol enhancements and faster delivery of secure circuit constructions. Impact highlights: - Establishes a concrete path toward the GKR IOP protocol for cryptographic circuit construction with frontend and backend implementations and a robust Chip structure to orchestrate commit and GKR phases. - Introduces EvalExpression to support in-phase computations, enabling richer circuit evaluation without destabilizing the pipeline. - Strengthens correctness and robustness of the verification path through rotation verifier enhancements, refined selector formulas, and improved gkr_witness handling. - Demonstrated end-to-end progress with committed groundwork (frontend/backend for circuit building) and verifier improvements, aligning with a modular, maintainable architecture for subsequent feature work.
Activity
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Quality Metrics
Correctness91.2%
Maintainability82.2%
Architecture93.4%
Performance81.2%
AI Usage35.6%
Skills & Technologies
Programming Languages
AssemblyPythonRust
Technical Skills
BenchmarkingCI/CDCircuit BuildingCircuit DesignCryptographic PrimitivesCryptographyElliptic Curve CryptographyGKR IOPGKR ProtocolProtocol DesignRustRust ProgrammingRust programmingSumcheck ProtocolZero-Knowledge Proofs
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