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# Chat encryption — review of Phase 15 and an implementation plan
+> **Superseded by `MESHBAY_DESIGN.md`.** This was the chat encryption design; its design
+> content now lives in §4.5 (encryption and epochs), §3.3 (sender authentication), §13.6.
+>
+> It is kept because code comments, tests and other documents cite its
+> sections and its labels, and because it records reasoning a synthesis
+> compresses. **Where it disagrees with `MESHBAY_DESIGN.md`, the design
+> document is right; where either disagrees with the code, the code is.**
+> `MESHBAY_DESIGN.md` §16 maps every section reference here onto its
+> replacement, and §13 defines every label.
+
> Status: **Design A decided and BUILT (2026-09-07). MNP 2.0 — a break, and
> deliberately not an option.** There is no switch: chat is encrypted, and a 1.x
> peer is refused at the handshake with `version_too_old` rather than connecting