Its not that hard to edit a run - especially if you stream on twitch...
Entire past broadcasts on Twitch shouldn't be allowed as proof even if timestamped because the video will just get deleted in 2 weeks.
Yeah we need permanent video proof to be accepted on the boards.
If you streamed your run on Twitch, just create an highlight of your run it's not really hard to do, just go to the past broadcast video and click on "Highlight" and select the part of the run (highlights are never auto deleted)
you can do the same on YouTube if you were streaming there
If you stream on YT you can edit the vod with the YT video editor or yeah you can eventually join the timestamp on your video link for the submission (like youtube.com/watch?v=ID&t=timestamp )
I didn't record my runs cause my pc doesn't work good with my capture card I'll be fixing it