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-rw-r--r--docs/MESHBAY_DESIGN.md10
1 files changed, 7 insertions, 3 deletions
diff --git a/docs/MESHBAY_DESIGN.md b/docs/MESHBAY_DESIGN.md
index 799b162..561ac82 100644
--- a/docs/MESHBAY_DESIGN.md
+++ b/docs/MESHBAY_DESIGN.md
@@ -3056,9 +3056,13 @@ epoch key from `chat_keys_req`, a message sealed under the current epoch through
the sending device's derived subkey and signed with its key on the node, which
must be the device `device_hello` named. A stored message is read signature
first, then key, then content, and one that fails any of them is shown as
-unreadable, never left out. The name shown is the one sealed by the sender; the
-roster check that the signing device belongs to the account the node names
-(Tier 2, §3.3) is the application's and not done here.
+unreadable, never left out. The name shown is the one sealed by the sender, and
+the signing device is checked against the group's roster as the application
+checks it (Tier 2, §3.3): chains of countersignatures walked from each account's
+roots, the keys accepted per account and node kept in the store, the roster read
+again once before a key is called changed — and only "changed" is said, under
+the message. `chat` alone opens the interactive chat: the groups, one group's
+conversation IRC-style with what the node pushes arriving live, and back.
**Deleting** (`rm`) is `file_delete` signed with the machine's key on the node
(§5.4): the node accepts the uploading account's devices and the operator's.