this post was submitted on 16 Jun 2023
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It really isn't. Most content out there is already immutable, you don't see people uploading the same Youtube video five times with minor changes or editing their images after the upload, most services don't even allow that for users, at best you can delete and upload a new video.
Furthermore, the blockchain would only contain metadata, not the actual data, so it's automatically thousands of times easier to store than the data itself.
Mirroring that content is a complete separate and optional part of the problem, the important part is having content named in such a way that I can go to a mirror and ask "do you have XYZ" and get an answer that you can trust. With URLs that's impossible, as they can show different content whenever they want.
Also this isn't exactly a new idea, that's how most software development already works these days. A Git repository stores a copy of every little change, and every download retrieves that complete history. What's missing is some infrastructure on top of that that links all the different repositories together into one namespace (GitHub kind of does that internally, but that's of no help for repositories hosted elsewhere).
Ok, so what if this blockchain has a metadata link to a video, which is hosted somewhere, and i remove that video from that host? How is that different than just a URL pointing to that video if the blockchain just holds metadata?
I don't understand what you are solving.
The issue is that URLs don't point to videos, they point to servers. What that server returns in response to an URL query is arbitrary. Might be a video today, could be a different video tomorrow, or a completely different website all together since the domain switched owners. Almost all URLs break over the course of a couple of years.
By using content-addressing (i.e. Merkel tree, SHA256, etc.) you are able to link to the video itself. It doesn't matter if the server changes owner, your link will still point to that exact video. This does not automatically allow you to download the video of course, since the original server is still gone, but it allows you to ask others if they have a copy of that video and it allows you to verify that they returned the exact video you were looking for.
The blockchain or DHT, or whatever it might be in the end, would be used to organize the content-addresses and allow you to ask others for that video automatically. Or allow them to discover that new videos have been published. It would also provide some censorship resistance/transparency, since at the moment deleted content often just silently disappears, without any hint that it ever existed. A blockchain would keep record of what was there and why it was deleted.
For a realistic example, see this thread, it's available https://beehaw.org/post/575371, but it's also available at https://feddit.de/post/854874. The Fediverse does the mirroring just fine, but the URLs give no indications that it's the same post. If Beehaw goes down tomorrow, how are you going to find post 575371? That's the kind of problem you wouldn't be having with content-addressing or other globally unique ids.