Chunk 5.0

In this chunk, the assistant completed the first real end-to-end validation of the cuzk proving pipeline. After building with `--features cuda-supraseal` for GPU acceleration on an RTX 5070 Ti (Blackwell, CUDA 13.1), the daemon was started with `FIL_PROOFS_PARAMETER_CACHE=/data/zk/params` and a 51 MB PoRep C1 output was submitted via gRPC. The first proof completed in 116.8 seconds, including a ~15 second SRS parameter load from disk, producing a valid 1920-byte Groth16 proof. A second proof with the SRS already cached in memory completed in 92.8 seconds, demonstrating a 20.5% improvement from SRS residency. Both proofs passed internal verification, and the daemon correctly tracked metrics, queue depth, and proof counts. Building on this validation, the assistant then hardened Phase 0 with several improvements to make Phase 1 development easier to debug. Key additions included: tracing spans with `job_id` correlation so all upstream `filecoin-proofs` logs are tagged per-job; timing breakdown separating deserialization from proving time; per proof-kind Prometheus counters and duration summaries; GPU detection via `nvidia-smi` shown in status; a fixed `AwaitProof` RPC supporting late listeners; graceful shutdown via a watch channel; and a `cuzk-bench batch` command for sequential and concurrent throughput measurement. A sample config file (`cuzk.example.toml`) was also added. Two git commits were made on the `feat/cuzk` branch, checkpointing the scaffold and hardening phases. The overarching theme was moving from "it compiles and the pipeline works" to "it produces real proofs with measurable performance characteristics and is instrumented for debugging the concurrent multi-GPU work coming in Phase 1." The assistant explicitly prioritized observability and correctness improvements that would make Phase 1 development faster and less error-prone.

From Validation to Hardening: The cuzk Proving Daemon's Journey Through Real Proofs and Production Observability 2726 words

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