Following the confirmed 2026-07-30 Coinkite COLDCARD low-entropy incident,
plan three deliverables as a single 3-task quick plan:
1. docs/security/ENTROPY-SEED-AUDIT-2026-07-31.md — evidence-backed audit of
every key-material path (Rust/TS/shell), adjudicating research findings
[ARCHY-1]..[ARCHY-4] with file:line evidence, incl. the one-ISO-many-nodes
correlation risk and an explicit UNVERIFIED on-node checklist.
2. docs/security/PSBT-SIGNING-ARCHITECTURE.md — descriptor watch-only,
wsh(sortedmulti) multisig, air-gap transport, honest LND limits
(channel/revocation/HTLC keys cannot be air-gapped), hot wallet as
explicitly secondary, migration path, phased rollout.
3. Remediation backlog into docs/UNIFIED-TASK-TRACKER.md + one gated
hardening fix (explicit-OsRng injection at the mnemonic call site) proven
by a known-answer test that cannot exist before the change.
Audit-and-spec only — no wallet/signing implementation. Verify gates enforce
file:line evidence density and a secret-shaped-string check on both docs, and
assert no commit authored by this plan touches the concurrent agent's files.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
