implement check

lib/storage.js

@@ -385,13 +385,32 @@ Storage.prototype.fetchAddresses = function(walletId, cb) {
 
 Storage.prototype.storeAddressAndWallet = function(wallet, addresses, cb) {
   var self = this;
+
   var addresses = [].concat(addresses);
   if (addresses.length == 0) return cb();
-  this.db.collection(collections.ADDRESSES).insert(addresses, {
-    w: 1
-  }, function(err) {
-    if (err) return cb(err);
-    self.storeWallet(wallet, cb);
+
+  async.filter(addresses, function(address, next) {
+    self.db.collection(collections.ADDRESSES).findOne({
+      address: address.address,
+    }, {
+      walletId: true,
+    }, function(err, result) {
+      if (err || !result) return next(true);
+      if (result.walletId != wallet.id) {
+        log.warn('Address ' + address.address + ' exists in more than one wallet.');
+        return next(true);
+      }
+      // Ignore if address was already in wallet
+      return next(false);
+    });
+  }, function(newAddresses) {
+    if (newAddresses.length == 0) return cb();
+    self.db.collection(collections.ADDRESSES).insert(newAddresses, {
+      w: 1
+    }, function(err) {
+      if (err) return cb(err);
+      self.storeWallet(wallet, cb);
+    });
   });
 };