Default coin selection is BTC - Bitcoin

src/js/index.js

@@ -818,6 +818,9 @@
             var option = $("<option>");
             option.attr("value", i);
             option.text(network.name);
+            if (network.name == "BTC - Bitcoin") {
+                option.prop("selected", true);
+            }
             DOM.phraseNetwork.append(option);
         }
     }