diff --git a/lib/storage.js b/lib/storage.js
index 7cf6a7f..b4c1960 100644
--- a/lib/storage.js
+++ b/lib/storage.js
@@ -609,6 +609,31 @@ Storage.prototype.storeActiveAddresses = function(walletId, addresses, cb) {
   }, cb);
 };
 
+
+Storage.prototype.storeTxHistoryCache = function(walletId, firstPosition, items, cb) {
+  var self = this;
+
+  self.db.collection(collections.CACHE).findOne({
+    walletId: record.walletId,
+    type: 'historyCache'
+  }, function(err, result) {
+    if (err) return cb(err);
+    result = result || [];
+
+    result 
+  self.db.collection(collections.CACHE).update({
+      walletId: record.walletId,
+      type: record.type,
+      key: record.key,
+    }, record, {
+      w: 1,
+      upsert: true,
+    }, next);
+  }, cb);
+};
+
+
+
 Storage.prototype.fetchActiveAddresses = function(walletId, cb) {
   var self = this;