Chunk 10.1

The assistant launched a deep-dive investigation into a production bug where PoRep PSProve tasks fail with "porep failed to validate" when processed through CuZK, despite Snap PSProve tasks and normal CuZK PoRep C2 working correctly. The primary task was to identify the exact plumbing difference between the normal PoRep CuZK path (`cuzk_funcs.go`) and the PSProve PoRep path (`task_prove.go`) that causes this specific failure mode. The user confirmed the issue was isolated to the PSProve + CuZK combination, ruling out general CuZK or PSProve infrastructure problems. The assistant meticulously compared both code paths, tracing the `RegisteredProof` enum through Go, the CuZK protobuf, and the Rust CuZK engine. A key discovery was that the Rust CuZK prover ignores the `registered_proof` field from the gRPC request for PoRep and instead uses the value embedded inside the C1 JSON output itself, ruling out a simple enum mapping mismatch. The investigation identified the critical structural difference: the PSProve path defines a *local* `c1OutputWrapper` struct instead of using the shared `wrapC1Output` function, and it re-marshals the C1 output from a Go struct rather than passing the raw Rust JSON bytes from `ffi.SealCommitPhase1()`. Since the non-CuZK PSProve path works, the JSON round-trip itself was confirmed to be functionally correct, narrowing the focus to how the CuZK Rust pipeline specifically deserializes the `VanillaProof` bytes from the wrapper. The dominant theme is cross-language (Go/Rust) protocol-level debugging, shifting from platform hardening to the core proving pipeline's data serialization boundaries. The next steps involve comparing the `C1OutputWrapper` struct definitions (particularly the `SectorNum` type mismatch of `int64` vs `u64`), examining how the CuZK Rust engine parses the `VanillaProof` bytes in `pipeline.rs` and `engine.rs`, and checking if the re-marshaled Go JSON introduces subtle structural differences (like field ordering or whitespace) that affect the Rust `serde_json` deserialization of `SealCommitPhase1Output`.

Tracing the Data Boundary: A Cross-Language Debugging Odyssey Through Filecoin's PoRep PSProve Pipeline 2309 words

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