[enh] #413 create function get_currency

silkaj/blockchain_tools.py

@@ -48,3 +48,10 @@ class HeadBlock:
     def get_head(self):
         client = ClientInstance().client
         return client(blockchain.current)
+
+
+def get_currency():
+    client = ClientInstance().client
+    head_block = HeadBlock().head_block
+    currency = head_block["currency"]
+    return currency