diff --git a/src/wormhole/_c3.py b/src/wormhole/_c3.py
new file mode 100644
index 0000000..98d64e2
--- /dev/null
+++ b/src/wormhole/_c3.py
@@ -0,0 +1,76 @@
+from ._machine import Machine
+
+class WormholeMachine:
+    m = Machine()
+
+    know_nothing = m.State("know_nothing", initial=True)
+    know_code = m.State("know_code")
+    know_key = m.State("know_key", color="orange")
+    #verified_key = m.State("verified_key", color="green")
+    closed = m.State("closed")
+
+    API_send = m.Event("API_send")
+    WM_set_code = m.Event("WM_set_code")
+    WM_rx_pake = m.Event("WM_rx_pake")
+    #WM_rx_msg = m.Event("WM_rx_msg")
+    close = m.Event("close")
+
+    @m.action()
+    def set_code(self):
+        self._MM.set_nameplate()
+        self._build_pake()
+        self._MM.send(self._pake)
+    @m.action()
+    @m.outcome("pake ok")
+    @m.outcome("pake bad")
+    def compute_key(self):
+        self._key = self._computer_stuff()
+        if 1:
+            return "pake ok"
+        else:
+            return "pake bad"
+    @m.action()
+    def send_version(self):
+        self._MM.send(self._version)
+    @m.action()
+    @m.outcome("verify ok")
+    @m.outcome("verify bad")
+    def verify(self, msg, verify_ok, verify_bad):
+        try:
+            decrypted = decrypt(self._key, msg)
+            return verify_ok(decrypted)
+        except CryptoError:
+            return verify_bad()
+    @m.action()
+    def queue1(self, msg):
+        self._queue.append(msg)
+    @m.action()
+    def queue2(self, msg):
+        self._queue.append(msg)
+    @m.action()
+    def close_lonely(self):
+        self._MM.close("lonely")
+    @m.action()
+    def close_scary(self):
+        self._MM.close("scary")
+
+    compute_key.upon("pake ok", goto=send_version)
+    compute_key.upon("pake bad", goto=close_scary)
+    know_nothing.upon(API_send, goto=queue1)
+    queue1.goto(know_nothing)
+    know_nothing.upon(WM_set_code, goto=set_code)
+    set_code.goto(know_code)
+    know_code.upon(API_send, goto=queue2)
+    queue2.goto(know_code)
+    know_code.upon(WM_rx_pake, goto=compute_key)
+    compute_key.goto(send_version)
+    send_version.goto(know_key)
+    know_code.upon(close, goto=close_lonely)
+    know_key.upon(close, goto=close_lonely)
+    close_lonely.goto(closed)
+
+
+if __name__ == "__main__":
+    import sys
+    WM = WormholeMachine()
+    WM.m._dump_dot(sys.stdout)