Reference Matrix Home Server

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diff --git a/docs/server-server/protocol-format b/docs/server-server/protocol-format
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+
+Transaction
+===========
+
+Required keys:
+
+============ =================== ===============================================
+    Key            Type                         Description
+============ =================== ===============================================
+origin       String              DNS name of homeserver making this transaction.
+ts           Integer             Timestamp in milliseconds on originating 
+                                 homeserver when this transaction started.
+previous_ids List of Strings     List of transactions that were sent immediately
+                                 prior to this transaction.
+pdus         List of Objects     List of updates contained in this transaction.
+============ =================== ===============================================
+
+
+PDU
+===
+
+Required keys:
+
+============ ================== ================================================
+    Key            Type                         Description
+============ ================== ================================================
+context      String             Event context identifier
+origin       String             DNS name of homeserver that created this PDU.
+pdu_id       String             Unique identifier for PDU within the context for
+                                the originating homeserver.
+ts           Integer            Timestamp in milliseconds on originating 
+                                homeserver when this PDU was created.
+pdu_type     String             PDU event type.
+prev_pdus    List of Pairs      The originating homeserver and PDU ids of the
+             of Strings         most recent PDUs the homeserver was aware of for
+                                this context when it made this PDU.
+depth        Integer            The maximum depth of the previous PDUs plus one.
+============ ================== ================================================
+
+Keys for state updates:
+
+================== ============ ================================================
+    Key               Type                      Description
+================== ============ ================================================
+is_state           Boolean      True if this PDU is updating state.
+state_key          String       Optional key identifying the updated state within
+                                the context.
+power_level        Integer      The asserted power level of the user performing
+                                the update.
+min_update         Integer      The required power level needed to replace this
+                                update.
+prev_state_id      String       The homeserver of the update this replaces
+prev_state_origin  String       The PDU id of the update this replaces.
+user               String       The user updating the state.
+================== ============ ================================================
+
+
+
+