Niche creators using automated hosting services.
Technical videos for 3D modeling or game development (like those found on ArtStation or Gumroad). 5f8902af00328cd3e2fb1_source.mp4
Artists often upload process videos or "speedpaints" where the source file is named with a hash like this. Niche creators using automated hosting services
While the specific alphanumeric string doesn't point to one single famous "piece" in general public databases, this naming convention is typical for: 5f8902af00328cd3e2fb1_source.mp4
If you found this in a specific community (like a Discord for digital painters or a subreddit for game dev), it likely refers to a for a tutorial or a high-quality animation loop.