Assetbundle version - download only edited assetbundles

I have lot of asset bundles to manage in my game.I've googled about asset bundle version control and found that giving the new version number to the loadcache method would download asset bundles again.anyway I don't want to give a new version number for all asset bundles(to download all) I want to download asset bundles those are updated(edited).

in this case for now, I can only think about saving asset names and version numbers in a txt file and update it when building assets and upload to server(or I can save data to DB) and use those data when calling loadcache(bit messy and painful?). I've tried to use CRC(giving same version number,,which removes cached ab's automatically) but CRC changes when building asset bundles with a different machine. so my question is..is this the only way(saving to a txt file) or is their any good way to solve this messy problem?