fix misprint

app/api/routes/_blockchain.py

@@ -150,7 +150,7 @@ async def s_api_v1_blockchain_send_purchase_content_message(request):
     content = r_content.open_content(request.ctx.db_session)
 
     licenses_cost = content['encrypted_content'].json_format()['license']
-    assert request.json['lisense_type'] in licenses_cost
+    assert request.json['license_type'] in licenses_cost
 
     return response.json({
         'address': request.json['content_address'],