- Adds F-13 (High) to the audit: the BIP-84 account PRIVATE key is imported
into Bitcoin Core (bitcoin.rs:203 disable_private_keys=false, :229-231
wpkh(xprv/...)), so the spending key is persisted outside the Argon2
envelope in a wallet with an empty passphrase; the descriptors also carry
no [fingerprint/derivation] key origin, so no hardware signer could ever
use them. Found by tracing secret class (1) end-to-end
- Fills the Remediation Backlog: R-00..R-15, prioritised severity x effort,
each with the finding it closes, files, effort, and hardware gating; plus
an explicit "not implemented here, and why" section
- Records ARCHY-1 as APPLIED with the exact test evidence and an honest note
that making the source explicit removes a future failure mode rather than
repairing a past one
- Wires the resulting open items into docs/UNIFIED-TASK-TRACKER.md in its
existing tier/checkbox format: Tier 0 (cargo audit/deny CI, ceremony
mnemonic input, a five-item hygiene batch, secrets.rs OsRng), Tier 1 (ISO
fail-open first-boot secrets, Argon2 vs ADR-005, the on-node checklist),
Tier 2 (the Critical unauthenticated seed RPCs, PSBT Phase 1, PSBT phases
2-7, seed-RPC transport confinement)
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
