Chunk 4.0

In this session, the assistant executed the Phase 0 implementation of the `cuzk` pipelined SNARK proving engine from scratch, following the detailed roadmap in `cuzk-project.md`. The entire `extern/cuzk/` Rust workspace was created, comprising six crates (`cuzk-proto`, `cuzk-core`, `cuzk-server`, `cuzk-daemon`, `cuzk-bench`, `cuzk-ffi`). The assistant defined the full gRPC protobuf API for proof submission and daemon management, implemented the core engine architecture with a priority scheduler, and wired the prover module to the real `filecoin-proofs-api` calls for `seal_commit_phase2`. A major focus of the work was resolving build system and integration challenges to compile the workspace against the existing Filecoin proving stack (bellperson, storage-proofs, supraseal-c2). The assistant fixed Rust edition incompatibilities by pinning a `rust-toolchain.toml`, added missing dependencies, and increased gRPC message size limits to handle the ~50 MB PoRep C1 inputs. The effort culminated in a successful end-to-end validation of the gRPC pipeline: the daemon was started, `cuzk-bench status` queried it correctly, and a full PoRep C2 proof submission was attempted. While the proof itself failed due to the absence of 32 GiB Groth16 parameters on the test machine, the entire request/response cycle, including error propagation, was verified. The overarching theme of this session was establishing a robust, compilable foundation and proving the core communication path. The assistant systematically built out the crate structure, defined the data types and RPCs, and wired everything into runnable daemon and client binaries. The immediate next steps are to fetch the necessary 32 GiB parameters via `curio fetch-params` and generate vanilla proof data to enable a fully successful proof execution. This solidifies the Phase 0 scaffold, providing a working skeleton ready for extension with multi-proof-type support, SRS management, and batching in subsequent phases.

From Blueprint to Working Pipeline: The Phase 0 Construction of the cuzk SNARK Proving Engine 1978 words

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