Problem is everone gets a new url. Haven't foun a good way to check if one link to medium is the same as another. This breaks a number of things like duplicate

Problem is everone gets a new url. Haven't foun a good way to check if one link to medium is the same as another. This breaks a number of things like duplicate checking for news aggregators and tag suggestions for bookmarking services. Edit: checking now it seems at keast the part before hash stayed unchanged after copy-pasting into another browser and loading. Have they changed or have I misunderstood the whole time?