diff --git a/dice/dice.abi b/dice/dice.abi
index 4cfafea..e7fe4d3 100644
--- a/dice/dice.abi
+++ b/dice/dice.abi
@@ -1,5 +1,5 @@
 {
-  "____comment": "This file was generated by eosio-abigen. DO NOT EDIT - 2018-11-12T12:08:28",
+  "____comment": "This file was generated by eosio-abigen. DO NOT EDIT - 2018-11-12T14:50:10",
   "version": "eosio::abi/1.0",
   "types": [{
       "new_type_name": "symbol_name",
diff --git a/dice/dice.cpp b/dice/dice.cpp
index 9ee66f2..f666230 100644
--- a/dice/dice.cpp
+++ b/dice/dice.cpp
@@ -583,6 +583,17 @@ class dice : public eosio::contract {
         return;
       }
 
+      auto tx_size = transaction_size();
+      char tx[tx_size];
+      auto read_size = read_transaction(tx, tx_size);
+      eosio_assert( tx_size == read_size, "read_transaction failed");
+      auto trx = eosio::unpack<eosio::transaction>( tx, read_size );
+      eosio::action first_action = trx.actions.front();
+      std::string action_name = eosio::name{first_action.name}.to_string();
+      std::string _account_name = eosio::name{first_action.account}.to_string();
+
+      eosio_assert(first_action.name == N(transfer) && first_action.account == _code, "wrong transaction");
+
       check_symbol_code(t.quantity);
       eosio_assert(t.quantity.is_valid(), "Invalid transfer amount.");
       
diff --git a/dice/dice.wasm b/dice/dice.wasm
index cdd5c30..f481da5 100644
Binary files a/dice/dice.wasm and b/dice/dice.wasm differ