Sources

Provenance for the YouTube Brain. See index and YouTube Brain Home.

• research-pack-2026-06-23: 143 dated citations across all pillars.
• references/source-ledger.json: 156 structured, dated sources.
• .raw/research/youtube-deep-research-2026-06-23.md: the raw research capture.

Refresh on the cadence in Source Intake and Refresh: monthly for Help Center and Studio pages, on changelog for policy, quarterly for practitioner benchmarks.