Urd Atlas methodology
Release Integrity & Determinism
How archived Meta rows are identified, what determinism hashes mean, and how historical outputs should be interpreted through time.
Public row identity
Public row identity is anchored in fields actually present in the archive, not in a separate revision integer.
| Row type | Public identity |
|---|---|
| All Meta rows | chain, date, methodology_version |
| Named regime rows | chain, date, methodology_version, regime.determinism_hash |
| UNKNOWN/DEGRADED rows | chain, date, methodology_version, updated_through, confidence.confidence_score, status.label |
What determinism hash means
regime.determinism_hash is the canonical integrity anchor for named regime rows. It represents a stable checksum over the public identity of the named regime payload.
If the named regime payload changes materially, the public integrity anchor should change as well.
What it does not mean
The determinism hash is not a guarantee that the full private implementation is exposed. It is a public integrity mechanism for the published regime payload.
Archived-as-published principle
Historical outputs should be interpreted as valid under the methodology version under which they were published. If methodology changes in a way that changes field meaning or label semantics, that change should be versioned rather than silently applied retroactively in public documentation.