d4l, you make it hard not to tease you a bit...
Okay, you have a stream and you want to find out if it's authentic or not. It claims to show a live feed from the ISS. Now, you don't actually give us the link to the feed, so I'll assume it's the top one when googling:
https://www.youtube.com/watch?v=RtU_mdL2vBMIt's currently showing a beautiful video from what certainly appears to be the ISS with the solar panels off to the sides with a cloudy blue-white half-sphere.
[It's showing Earth with a curvature and since we all know the Earth is flat, clearly it's fake, but let's ignore that for a moment
]
You could do any number of things to verify the authenticity. You could check NASA's own website, see if they have a feed or link to one (they do). Does it match? (no, it doesn't).
In fact, right now, the live stream is Pretty F*cking Boring. You know why? 'Cause the ISS is over Eastern Russia where it's
night. The location of the ISS isn't exactly secret and you can look it up easily enough. So, no, the feed linked above is NOT a live feed from the ISS.
Now, the ISS moves quite quickly and will soon be into the light again. On the other hand, that youtube clip is showing the ISS crossing the terminator into darkness RIGHT NOW, so it could be an ISS feed delayed by 45 minutes (the ISS sees one sunset and one sunrise every 90 minutes) or it could be much older. I'm not going to expend any more energy trying to pin it down, but if you wanted to, you could look for events such as rocket launches to get a very precise time or at least get a rough idea from the terminator location as the ISS crosses (a 24 hour day doesn't divide very nicely into 90 minutes, so the ISS will cross the terminator over different parts of the Earth depending on the date).
If you want a link to the real live ISS feed, NASA has you covered:
https://eol.jsc.nasa.gov/ESRS/HDEV/Modified to add: Under US copyright law, all works created by the US Federal Government or its Agencies are legally in the public domain. As a result ANYONE can take the video from the NASA site and stick it on youtube and earn dollars from ads.