DS-002: weight-provenance scan of the Pearl certificate corpus (OBS-005)

Datasets and graded result for a pre-registered weight-provenance scan over the Pearl blockchain's certificate corpus. 1,109 blocks commit byte-exactly to published LLM checkpoint tensors (Llama-3.3-70B, Llama-3.1-8B, Gemma-4-31B) via per-block keyed BLAKE3 Merkle roots, with zero matches across 2,130,000 negative-control pairs; the practice resolves to a handful of operators in the chain's first month. Consensus verification authenticates the opened strips against the committed root, so a match proves the sampled outputs were computed from strips of the published tensor after a publicly derivable perturbation. Only public static checkpoints are externally verifiable, so the measurement is a lower bound on useful work, never evidence of its absence. The deposit contains the frozen pre-registration (PREREG-002), the graded result (OBS-005), three complete datasets (every scanned pair, match or not), sha256 manifests, licence and errata policy. Every table regenerates from the datasets alone via the scripts at the linked repository, tag ds-002-v1; any single match verifies independently from raw block bytes.