Update protocol.md

doc/protocol.md

@@ -7,15 +7,15 @@ NodeCoin defines its own protocol called NCP. NCP is actually a stack of two pro
                 ------------
                      ▼
                 ------------
-            ,-- |   NCTP   | NodeCoin Transport Protocol
-            |   ------------
-            |        ▼
-            |   ------------
-    NCP --- +-- |   NCCP   | NodeCoin Currency Protocol
+                |   HDC    | Human Dividend Currency Format
+                ------------
+                     ▼
+                ------------
+            ,-- |   NCCP   | NodeCoin Currency Protocol
             |   ------------
-            |        ▼
+    NCP --- +        ▼
             |   ------------
-            `-- |   HDC    | Human Dividend Currency Format
+            `-- |   NCTP   | NodeCoin Transport Protocol
                 ------------
 
 More details on each layer:
@@ -23,6 +23,6 @@ More details on each layer:
 Layer | Role
 ----- | ----
 NodeCoin | The software that implements NCP. One instance of NodeCoin handles only one currency.
-[NCTP](https://github.com/c-geek/nodecoind/blob/master/doc/NCTP.md) | The protocol allowing to exchange HDC messages over HTTP.
-[NCCP](https://github.com/c-geek/nodecoind/blob/master/doc/NCCP.md) | The protocol defining rules on HDC messages (the currency rules).
 [HDC](https://github.com/c-geek/nodecoind/blob/master/doc/HDC.md) | A format defining messages to describe an HDC system.
+[NCCP](https://github.com/c-geek/nodecoind/blob/master/doc/NCCP.md) | The protocol defining rules on HDC messages (the currency rules).
+[NCTP](https://github.com/c-geek/nodecoind/blob/master/doc/NCTP.md) | The protocol allowing to exchange HDC messages over HTTP.
\ No newline at end of file