Tumblr did something similar, but only for exact matches. You can tell if it’s a legacy image or not by looking for a hash in the image url path. Legacy style:

Tumblr did something similar, but only for exact matches. You can tell if it’s a legacy image or not by looking for a hash in the image url path. Legacy style: https://66.media.tumblr.com/tumblr_m61cvzNYF81qg0jdoo1_640.gif https://66.media.tumblr.com/tumblr_m61cvzNYF81qg0jdoo1_640.g... New style: https://66.media.tumblr.com/76451d8fee12cd3c5971e20bb8e236e3/tumblr_nbp3h6eMwO1qzq92mo1_500.jpg https://66.media.tumblr.com/76451d8fee12cd3c5971e20bb8e236e3...