add some logic to deduce if node is monero

xmrnodes/helpers.py

@@ -0,0 +1,12 @@
+from requests import get as r_get
+
+def is_monero(url):
+    data = {"method": "get_block_header_by_height", "params": {"height": 0}}
+    try:
+        r = r_get(url + "/json_rpc", json=data)
+        r.raise_for_status()
+        assert "result" in r.json()
+        is_xmr = r.json()["result"]["block_header"]["hash"] == "418015bb9ae982a1975da7d79277c2705727a56894ba0fb246adaabb1f4632e3"
+        return is_xmr
+    except:
+        return False