diff --git a/protocol/diagrams/duplex-messaging/duplex-creating-v6.mmd b/protocol/diagrams/duplex-messaging/duplex-creating-v6.mmd
deleted file mode 100644
index 183e4bfa9..000000000
--- a/protocol/diagrams/duplex-messaging/duplex-creating-v6.mmd
+++ /dev/null
@@ -1,63 +0,0 @@
-sequenceDiagram
-  participant A as Alice
-  participant AA as Alice's<br>agent
-  participant AS as Alice's<br>server
-  participant BS as Bob's<br>server
-  participant BA as Bob's<br>agent
-  participant B as Bob
-
-  note over AA, BA: status (receive/send): NONE/NONE
-
-  note over A, AA: 1. request connection<br>from agent
-  A ->> AA: NEW: create<br>duplex connection
- 
-  note over AA, AS: 2. create Alice's SMP queue
-  AA ->> AS: NEW: create SMP queue
-  AS ->> AA: IDS: SMP queue IDs
-  note over AA: status: NEW/NONE
-
-  AA ->> A: INV: invitation<br>to connect
-
-  note over A, B: 3. out-of-band invitation
-  A ->> B: OOB: invitation to connect
-
-  note over BA, B: 4. accept connection
-  B ->> BA: JOIN:<br>via invitation info
-  note over BA: status: NONE/NEW
-
-  note over BA, AS: 5. secure Alice's SMP queue
-  BA ->> AS: SKEY: secure queue (this command needs to be proxied)
-  note over BA: status: NONE/SECURED
-
-  note over BA, BS: 6. create Bob's SMP queue
-  BA ->> BS: NEW: create SMP queue
-  BS ->> BA: IDS: SMP queue IDs
-  note over BA: status: NEW/SECURED
-
-  note over BA, AA: 7. confirm Alice's SMP queue
-  BA ->> AS: SEND: Bob's info without sender's key (SMP confirmation with reply queues)
-  note over BA: status: NEW/CONFIRMED
-
-  AS ->> AA: MSG: Bob's info without<br>sender server key
-  note over AA: status: CONFIRMED/NEW
-  AA ->> AS: ACK: confirm message
-
-  note over AA, BS: 8. secure Bob's SMP queue
-  AA ->> BS: SKEY: secure queue (this command needs to be proxied)
-  note over BA: status: CONFIRMED/SECURED
-
-  AA ->> BS: SEND: Alice's info without sender's server key (SMP confirmation without reply queues)
-  note over AA: status: CONFIRMED/CONFIRMED
-
-  note over AA, A: 9. notify Alice<br>about connection success<br>(no HELLO needed in v6)
-  AA ->> A: CON: connected
-  note over AA: status: ACTIVE/ACTIVE
-
-  BS ->> BA: MSG: Alice's info without<br>sender's server key
-  note over BA: status: CONFIRMED/CONFIRMED
-  BA ->> B: INFO: Alice's info
-  BA ->> BS: ACK: confirm message
-
-  note over BA, B: 10. notify Bob<br>about connection success
-  BA ->> B: CON: connected
-  note over BA: status: ACTIVE/ACTIVE