diff --git a/app/index.html b/app/index.html
index 446caa1..db816f6 100644
--- a/app/index.html
+++ b/app/index.html
@@ -8343,26 +8343,34 @@ Bitcoin.Util = {
       });
     },
 
-    searchData: function (obsName, patternEval, dbName = this.dbName) {
-      return new Promise((resolve, reject) => {
-        this.openDB(dbName).then(db => {
-          var obs = db.transaction(obsName, "readonly").objectStore(obsName);
-          var filteredResult = {}
-          let curReq = obs.openCursor();
-          curReq.onsuccess = (evt) => {
-            var cursor = evt.target.result;
-            if (cursor) {
-              if (patternEval(cursor.primaryKey, cursor.value))
-                filteredResult[cursor.primaryKey] = cursor.value;
-              cursor.continue();
-            } else
-              resolve(filteredResult);
-          }
-          curReq.onerror = (evt) => reject(
-            `Search unsuccessful [${evt.target.error.name}] ${evt.target.error.message}`);
-          db.close();
-        }).catch(error => reject(error));
-      });
+    searchData: function (obsName, options = {}, dbName = this.dbName) {
+        options.lowerKey = options.atKey || options.lowerKey || 0
+        options.upperKey = options.atKey || options.upperKey || false
+        options.patternEval = options.patternEval || ((k,v) => {return true})
+        options.lastOnly = options.lastOnly || false
+        return new Promise((resolve, reject) => {
+            this.openDB(dbName).then(db => {
+            var obs = db.transaction(obsName, "readonly").objectStore(obsName);
+            var filteredResult = {}
+            let curReq = obs.openCursor(
+                    options.upperKey ? IDBKeyRange.bound(options.lowerKey,options.upperKey) : IDBKeyRange.lowerBound(options.lowerKey), 
+                    options.lastOnly ? "prev":"next" );
+            curReq.onsuccess = (evt) => {
+                var cursor = evt.target.result;
+                if (cursor) {
+                if (options.patternEval(cursor.primaryKey, cursor.value)){
+                    filteredResult[cursor.primaryKey] = cursor.value;
+                    options.lastOnly ? resolve(filteredResult) : cursor.continue();
+                }else 
+                    cursor.continue();
+                } else
+                resolve(filteredResult);
+            }
+            curReq.onerror = (evt) => reject(
+                `Search unsuccessful [${evt.target.error.name}] ${evt.target.error.message}`);
+            db.close();
+            }).catch(error => reject(error));
+        });
     }
   }
 </script>