diff --git a/webapp/controller/BlockChainController.class.php b/webapp/controller/BlockChainController.class.php
index f6470ba1..d64cfe26 100644
--- a/webapp/controller/BlockChainController.class.php
+++ b/webapp/controller/BlockChainController.class.php
@@ -230,7 +230,8 @@ class BlockChainController extends BaseAuthedController {
             'token_id' => $tokenId,
             'token_type' => $tokenType,
             'item_uniid' => $itemUniId,
-            'item_id' => $itemId
+            'item_id' => $itemId,
+            'net_id' => NET_ID
         );
         {
             $url = self::getWeb3ServiceUrl();
diff --git a/webapp/services/BlockChainService.php b/webapp/services/BlockChainService.php
index 9dafdbd7..95b8f4df 100644
--- a/webapp/services/BlockChainService.php
+++ b/webapp/services/BlockChainService.php
@@ -45,6 +45,7 @@ class BlockChainService {
             'a' => 'buy',
             'account' => $account,
             'price' => $price,
+            'net_id' => NET_ID
         );
         {
             $url = self::getWeb3ServiceUrl();
@@ -118,7 +119,8 @@ class BlockChainService {
             'a' => 'buy',
             'account' => $account,
             'price' => $price,
-            'owner_address' => $owner_address,
+            'seller' => $owner_address,
+            'net_id' => NET_ID
         );
         {
             $url = self::getWeb3ServiceUrl();