# Methodology: sources, verification and night-session rules

How Markets Open turns exchange notices into per-date records: three source tiers, what human verification means, night-session definitions, and what the site never asserts.

- Canonical: https://marketsopen.today/methodology
- English: https://marketsopen.today/methodology · Chinese: https://marketsopen.today/zh/methodology
- data_version: 2026.09.28-rc.6 · ui_version: 1.4.0

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This Markdown mirrors the HTML page. null/unknown means no assertion, never closed. Facts restated from official notices; notice text is not reproduced.