- 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>
Evidence-backed audit of every secret class against the real tree, prompted
by the 2026-07-30 Coinkite COLDCARD entropy incident.
- No Coldcard-class entropy defect exists: no non-cryptographic PRNG, no
clock-seeded key, no Math.random() in any browser key path
- F-01 (Critical, NOT entropy): seed.generate/seed.restore are unauthenticated,
unrated, and unconditionally overwrite a live node's Ed25519/Nostr/FIPS keys
- F-02 [ARCHY-1] CONFIRMED: mnemonic entropy source is a bip39 transitive
default, not a call-site argument — the exact structural shape of T1
- F-03 (High) [ARCHY-3]: first-boot TLS/SSH regeneration is fail-open and its
completion marker is set even on failure, over a fleet-shared cached rootfs
- ARCHY-2 confirmed good; ARCHY-5 refuted as a present defect (32 | 256)
- Argon2::default() is 19MiB/t=2, not ADR-005's stated 64MB/3
- Corrects the scoping assumption that image-recipe/_archived/ is dead: it is
the live ISO builder, exec'd by build-debian-iso.sh
- Adds a "What we do right" section and an UNVERIFIED on-node checklist
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
