Every published figure carries a receipt record with these fields. The verifier recomputes the claim from the referenced public data and checks the hash locally.
| Field | Contents |
|---|---|
claim_id |
stable identifier, e.g. ALMANAC-T4-TILT |
statement |
the claim in one sentence, with its interval |
method_ref |
pointer to the published method note |
data |
public source and slice, e.g. lichess 2026-06, rated blitz |
seed |
the RNG seed(s) used |
engine |
engine version string, e.g. arcifact-k1 v5 |
expected_hash |
SHA-256 of the canonical result artefact |
date |
seal date, UTC |
corrections |
link into the corrections register |
claim_id: ALMANAC-T4-TILT
statement: >
Post-loss precision shifts −0.085pp [−0.105, −0.065]
(n = 142,090); the effect grows with rating.
method_ref: methods/tilt.md
data: lichess 2026-06, rated blitz, evaluated games
seed: 20250718
engine: arcifact-k1 v5
expected_hash: (issued with the launch records)
date: (issued with the launch records)
corrections: claims/CORRECTIONS.md
Records stream from launch. The illustrative entry above uses the real published figures; its hash and date fields are issued when the record is.