Occasionally my personal/literature/academic/tech notes link to a youtube source, but when clicking on it I find the video has vanished with no way of knowing what it was or even what it was called (it's sometimes impossible to track down an identical/replacement source). I lost many valuable references that way.

Wayback machine solves for webpages, but nothing I'm aware of (short of youtube-dl-ing the video yourself and storing it somewhere openly, probably at risk of various infringements) solves this. Quite a lot of hassle for something rather simple.

It would be great to be able to immortalise them on a per-video basis, so if it's important enough, we can be sure that references made to the content will still be there in the future when needed.