Chunk 10.0

This session continued hardening the vast-manager platform and enhancing the web UI. Benchmark error reporting was improved by shipping cuzk-daemon logs directly to the manager’s log-push API. The UI gained persistent deploy settings (max $/proof and disk stored in localStorage), multi-select checkboxes on the offers table, and a bulk action toolbar for deploying or ignoring multiple machines at once. The backend was refined to keep the highest benchmark score per machine in `host_perf` (using `MAX`), and 30 stale killed instances were cleaned from the database. The deploy API was also updated to reject offers on known-bad hosts before creating instances. Operational monitoring continued, with several instances progressing through the full lifecycle. A second RTX 4090 on the same physical machine (46.2/hr) and an RTX 5090 (25.9/hr) failed their minimum rate thresholds and were destroyed, while the first RTX 4090 (61.4/hr) and an RTX 3090 (35.6/hr) remained running. New instances were deployed on diverse hardware (RTX 5070 Ti, 2× RTX 5060 Ti, RTX 5090, 2× RTX 4080S) to gather more performance data, though some were immediately killed due to pre-emptively added entries in the `bad_hosts` table. The most critical development was a deep investigation into a production bug where PSProve tasks fail for PoRep challenges ("porep failed to validate") while Snap challenges work correctly. Tracing through `task_prove.go`, `porep_vproof_types.go`, `cuzk_funcs.go`, and `merkle.go`, the assistant identified a potential JSON serialization round-trip issue. The `Commit1OutRaw` struct is unmarshaled from the market’s JSON and then re-marshaled for cuzk; the Go types `PoseidonDomain` and `Sha256Domain` have custom `MarshalJSON` methods but lack `UnmarshalJSON`, and the `HasherDomain = any` type alias causes the custom marshalers to be bypassed on the round-trip. This likely produces JSON that differs from what the Rust cuzk backend expects, causing the verification failure. This investigation marked a shift from platform development to deep protocol-level debugging of the PoRep proving pipeline.

From Silent Failures to Cross-Language Serialization: A Comprehensive Platform Hardening and Protocol Debugging Journey 2316 words

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