add this class to read blockchain configuration

app/libs/blockchain.rb

@@ -0,0 +1,20 @@
+class Blockchain
+  class << self
+    def blockchain_config
+      blockchain_config = {}
+
+      begin
+        config = Rails.application.config_for(:configuration).symbolize_keys!
+        blockchain_config = config[:blockchain].symbolize_keys!
+        raise 'blockchain config missing' if blockchain_config.blank?
+      rescue => ex
+        raise ex if Rails.env.production?
+
+        puts %Q{\033[33m [warning] blockchain config or configuration.yml missing,
+                 please add it or execute 'cp config/configuration.yml.example config/configuration.yml' \033[0m}
+        blockchain_config = {}
+      end
+      blockchain_config
+    end
+  end
+end