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Every other derivation check compares this implementation against Python -- cross-verification, not ground truth. The BIP-85 specification's own test vectors (spec master xprv, 12- and 24-word BIP-39 children at index 0) are immune to the failure mode where both of our implementations share a misconception and agree with each other: Python has pinned them since early on (test_bip85_vectors.py), and now the TypeScript core runs them natively via a new Bip85.fromExtendedKey factory (the spec vectors start from an xprv, not a mnemonic). Python's pinned app-32 entropy and TOTP derivations from the same master ride along as cross-family anchors. All four pass on first contact -- an independent confirmation of the root derivation ahead of the external review, and recorded as such in the #34 review-strategy notes in TODO.md, along with the ultrareview size blocker (PR #989 spans 720k lines including beta's history) and its fallback options. Co-Authored-By: Claude Opus 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01Tkj4rzKBA3uhfgk7kqjsb8