Add Oblivious HTTP Sequence Diagram

Author: DanGould

bip-0077.mediawiki

@@ -217,6 +217,11 @@ OHTTP protects sender and receiver IP addresses from both one another and from t
 
 OHTTP relays can be run as basic HTTP proxies from wallet providers or third parties.
 
+====OHTTP Sequence Diagram====
+
+<img src=bip-0077/oblivious-http-sequence.png></img>
+
+
 ===Message Padding===
 
 All cyphertexts should be padded to the same length of 7168 bytes to prevent traffic analysis. This is sufficient size for most transaction PSBTs without exceeding the 8KB limit of many HTTP/1.1 web servers.