Add custom chains function to signed transactions

beem/transactionbuilder.py

@@ -291,7 +291,8 @@ class TransactionBuilder(dict):
             operations.default_prefix = self["blockchain"]["prefix"]
 
         try:
-            signedtx = Signed_Transaction(**self.json().update(custom_chains=self.steem.custom_chains))
+            signedtx = Signed_Transaction(**self.json())
+            signedtx.add_custom_chains(self.steem.custom_chains)
         except:
             raise ValueError("Invalid TransactionBuilder Format")
 

beembase/signedtransactions.py

@@ -29,6 +29,12 @@ class Signed_Transaction(GrapheneSigned_Transaction):
                     self.known_chains[c] = custom_chain[c]
         super(Signed_Transaction, self).__init__(*args, **kwargs)
 
+    def add_custom_chains(self, custom_chain):
+        if len(custom_chain) > 0:
+            for c in custom_chain:
+                if c not in self.known_chains:
+                    self.known_chains[c] = custom_chain[c]
+
     def sign(self, wifkeys, chain=u"STEEM"):
         return super(Signed_Transaction, self).sign(wifkeys, chain)