diff --git a/server/web3sign/metadata/factory.js b/server/web3sign/metadata/factory.js
index 00df9ce..5cab7d6 100644
--- a/server/web3sign/metadata/factory.js
+++ b/server/web3sign/metadata/factory.js
@@ -99,10 +99,10 @@ async function init() {
                     'Web3Sign'
                    );
 
-  // registerMetaClass(resDir + 'item@item.json',
-  //                   'id',
-  //                   'Item'
-  //                  );
+  registerMetaClass(resDir + 'item@item.json',
+                    'id',
+                    'Item'
+                   );
   load();
   {
     traverseMetaList('BlockChainDb', (dbConf, idx) => {
diff --git a/server/web3sign/services/blockchain.js b/server/web3sign/services/blockchain.js
index bdd9d28..4dc88dd 100644
--- a/server/web3sign/services/blockchain.js
+++ b/server/web3sign/services/blockchain.js
@@ -34,6 +34,10 @@ class BlockChain extends BaseService {
     return this.#bc.getUserAddress();
   }
 
+  isValidAddress(address) {
+    return this.#bc.isValidAddress(address);
+  }
+
   async soliditySha3Sign(...args) {
     const signStr = await this.#bc.web3.utils.soliditySha3(...args);
     let signature = await this.#bc.web3.eth.sign(signStr, this.getUserAddress());