You cited Git as an example, but in Git it’s possible to e.g. force-push a branch and if someone later fetches it with no previous knowledge they will get the original version.
The problem is the “with non previous knowledge” and is the reason this isn’t a storage issue. The way you would solve this in git would be to fetch a specific commit, i.e. you need to already know the hash of the data you want.
For the Wayback Machine this could be as simple as embedding that hash in the url. That way when someone tries to fetch that url in the future they know what to expect and can verify the website data matches the hash.
This won’t however work if you don’t already have such hash or you don’t trust the source of it, and I don’t think there’s something that will ever work in those cases.
You cited Git as an example, but in Git it’s possible to e.g. force-push a branch and if someone later fetches it with no previous knowledge they will get the original version.
The problem is the “with non previous knowledge” and is the reason this isn’t a storage issue. The way you would solve this in git would be to fetch a specific commit, i.e. you need to already know the hash of the data you want.
For the Wayback Machine this could be as simple as embedding that hash in the url. That way when someone tries to fetch that url in the future they know what to expect and can verify the website data matches the hash.
This won’t however work if you don’t already have such hash or you don’t trust the source of it, and I don’t think there’s something that will ever work in those cases.