Proof — Reports & evidence packs

Outputs

assembled from existing records — nothing re-entered

Output	Purpose	Snapshot	Status
Evidence pack · low-carbon wheat premium	Nunhill Mill contract	frozen 18 Jul 2026	current
Farm Proof Recorded coverage report	private · season review	live view	current
Evidence pack · retail review 2025	buyer technical review	frozen 2 Jun 2026	affected by addendum on -000188
Decision-to-outcome chronology · Field 4	private · dispute readiness	live view	1 named gap
Public-safe projection · reduced-N case study	reviewed derivative for public use	reviewed 28 Jun 2026	approved

A snapshot is a frozen, dated view — what was known when. When an addendum touches a source record, every affected output is flagged for review; refreshing re-assembles from sources and dates a new snapshot.

What an evidence pack contains

Facts

the records supporting each claim, with IDs and lifecycle state

Evidence

artefacts with provenance — source, timestamps, integrity hash

Methods

metric, unit, basis, method and period for every number

Limitations

stated first, not buried — including gaps and pending outcomes

Attribution

professional contributions preserved (adviser, lab, contractor)

Export manifest

machine-readable, reproducible

Every export carries its manifest: source record IDs, active filters, methods, exclusions with reasons, limitations, and the snapshot date. Reproducibility over persuasion.

{ "output": "evidence-pack-nunhill",
  "snapshot": "2026-07-18",
  "sources": ["PRF-UK-A-000214", "PRF-UK-A-000231", "PRF-UK-A-000232"],
  "methods": ["IPCC tier 2", "weighbridge"],
  "excluded": [{"id": "PRF-UK-A-000188", "reason": "outside purpose"}],
  "limitations": ["n=1 field", "single season"] }

Report rules: outputs assemble from governed sources and update from them; snapshots are dated and immutable; addenda flag affected outputs rather than silently changing them; public projections only exist after review.