diff --git a/music_kraken/objects/source.py b/music_kraken/objects/source.py
index 66a012e..26425a8 100644
--- a/music_kraken/objects/source.py
+++ b/music_kraken/objects/source.py
@@ -7,6 +7,7 @@ from urllib.parse import urlparse, ParseResult
 from dataclasses import dataclass, field
 from functools import cached_property
 
+from ..utils import generate_id
 from ..utils.enums.source import SourcePages, SourceTypes
 from ..utils.config import youtube_settings
 from ..utils.string_processing import hash_url, shorten_display_url
@@ -99,6 +100,8 @@ class Source:
 
 
 class SourceCollection:
+    __change_version__ = generate_id()
+
     _indexed_sources: Dict[str, Source]
     _page_to_source_list: Dict[SourcePages, List[Source]]
 
@@ -131,9 +134,15 @@ class SourceCollection:
         else:
             self._page_to_source_list[source.page_enum].append(source)
 
+        changed = False
         for key in source.indexing_values:
+            if key not in self._indexed_sources:
+                changed = True
             self._indexed_sources[key] = source
 
+        if changed:
+            self.__change_version__ = generate_id()
+
     def extend(self, sources: Iterable[Source]):
         for source in sources:
             self.append(source)
@@ -148,6 +157,10 @@ class SourceCollection:
     def source_pages(self) -> Iterable[SourcePages]:
         return sorted(self._page_to_source_list.keys(), key=lambda page: page.value)
 
+    @property
+    def hash_url_list(self) -> List[str]:
+        return [hash_url(source.url) for source in self.get_sources()]
+
     @property
     def url_list(self) -> List[str]:
         return [source.url for source in self.get_sources()]