diff --git a/server/common/constant.js b/server/common/constant.js
index 71bc01d..4c97859 100644
--- a/server/common/constant.js
+++ b/server/common/constant.js
@@ -3,8 +3,10 @@ const EVENTDB_STATE_HANDLED = 1;
 
 const GAMEDB_NAME = 'GameDb0';
 const BCEVENTDB_NAME = 'BcEventDb0';
+const BCNFTDB_NAME = 'BcNftDb0';
 
 exports.EVENTDB_STATE_PENDING = EVENTDB_STATE_PENDING;
 exports.EVENTDB_STATE_HANDLED = EVENTDB_STATE_HANDLED;
 exports.GAMEDB_NAME = GAMEDB_NAME;
 exports.BCEVENTDB_NAME = BCEVENTDB_NAME;
+exports.BCNFTDB_NAME = BCNFTDB_NAME;
diff --git a/server/web3bcspider/services/blockchain.js b/server/web3bcspider/services/blockchain.js
index 83f574f..eb589b0 100644
--- a/server/web3bcspider/services/blockchain.js
+++ b/server/web3bcspider/services/blockchain.js
@@ -39,7 +39,7 @@ class BlockChain extends BaseService {
   }
 
   getCurrBlockNumber() {
-    return this.#bc.currBlockNumber;
+    return this.#bc.getCurrBlockNumber();
   }
 
   async lockQuery() {
diff --git a/server/web3bcspider/services/erc721_refresher.js b/server/web3bcspider/services/erc721_refresher.js
index 00daa85..4b19f90 100644
--- a/server/web3bcspider/services/erc721_refresher.js
+++ b/server/web3bcspider/services/erc721_refresher.js
@@ -41,6 +41,14 @@ class Erc721Refresher extends BaseService {
       if (err) {
         throw err;
       }
+      if (rows.length > 0) {
+        await utils.serial(
+          rows,
+          async (row) => {
+            await this.refresh(row);
+          }
+        );
+      }
     } catch (err) {
         log.error(logHead + err);
         await utils.sleep(5000 + utils.randRange(1000, 3000));
@@ -64,6 +72,61 @@ class Erc721Refresher extends BaseService {
     return head;
   }
 
+  async refresh(row) {
+    while (true) {
+      await this.bc.mustBeActive();
+      const oldBlockNumber = this.bc.getCurrBlockNumber();
+      let oldOwner = await this.getOwner();
+      while (oldBlockNumber + 8 > this.bc.getCurrBlockNumber()) {
+        await utils.sleep(1000 + utils.randRange(0, 500));
+      }
+
+      await this.bc.mustBeActive();
+      const newBlockNumber = this.bc.getCurrBlockNumber();
+      let newOwner = await this.getOwner();
+
+      if (oldOwner == newOwner) {
+        const ok = await this.updateConfirmed(newOwner, oldBlockNumber, row);
+        if (ok) {
+          break;
+        }
+      }
+      await utils.sleep(1000 + utils.randRange(500, 1500));
+
+    }
+  }
+
+  async updateConfirmed(newOwner, blockNumber, row) {
+    const {err, nftDbConn} = await app.getDbConn(constant.BCNFTDB_NAME);
+    if (err) {
+      log.error('updateConfirmed:' + this.tokenId + ' err:' + err);
+      return false;
+    }
+    try {
+      {
+        const {err} = await nftDbConn.update(
+          't_nft',
+          [
+            ['net_id', row['net_id']],
+            ['token_id', row['token_id']],
+            ['contract_address', row['contract_address']],
+          ],
+          [
+            ['owner_address', bcutils.toNormalAddress(newOwner)],
+            ['confirm_count', this.nftDb['confirm_count'] + 1],
+            ['confirm_block_number', blockNumber]
+          ]);
+        if (err) {
+          log.error('updateConfirmed:' + this.tokenId + ' err:' + err);
+          return false;
+        }
+      }
+    } finally {
+      nftDbConn.release();
+    }
+    return true;
+  }
+
 }
 
 module.exports = Erc721Refresher;