Chunk 11.0

The session focused heavily on the active PSProve PoRep bug investigation, while the vast-manager worker system remained operational. The assistant systematically traced the `RegisteredSealProof` enum mappings across Go, C, and Rust, finding them all identical, and confirmed the CuZK gRPC service layer and Rust struct definitions (`SealCommitPhase1Output`) perfectly matched the Go `Commit1OutRaw`. The non-CuZK FFI path for PSProve was confirmed to work correctly with the Go-re-serialized JSON, proving the semantic validity of the round-trip. This narrowed the root cause to a subtle byte-level discrepancy in the JSON payload that causes the CuZK-generated SNARK to fail `ffi.VerifySeal`, likely due to a difference in how the public inputs are derived from the serialized data. The assistant investigated the user's hint about fr32 seed masking, discovering that `powsrv` does not apply the standard `seed[31] &= 0x3f` truncation. However, analysis of the Rust challenge derivation code showed the seed is used as raw bytes for SHA256, not directly as an Fr element, ruling this out as the intermittent failure's root cause (though it remains a correctness issue in `powsrv`). To resolve the bug, the assistant extended the existing 2KiB roundtrip test to cover the full CuZK wrapper and FFI C2 verification path, and added comprehensive diagnostic logging to `computePoRep` in `task_prove.go` to capture exact byte streams and verification inputs on failure.

The Art of Systematic Elimination: Debugging a PSProve PoRep CuZK Failure Across Go, C, and Rust 3513 words

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