Maybe not format; the image link syntax would be more accurate.

It used to be something like "primal dot net slash AbCd dot jpeg".

Now it's something like "blossom dot primal dot net slash AbcdEFgHiJKlMNoPqRStUVwXYZ dot jpeg"

Far more complex unique identifier now & you can tell it's a blossom server now rather than a far more simplistic link. 🤙