[mjhirn]

I haven't tried Mixnode yet, but the way I understand it, it lets you query websites and retrieve their HTML content that you can then parse - without you having to crawl the site. Looking at their Github, they seem to utilize WARC, so they may also allow you to request the website for certain timestamps?

That being said, I find this highly interesting, if it works like that. We are working on a peer-to-peer database that lets you query a semantic database, popularized mostly by public web data, but with strong guarantees of accurate and timely data, and this could be a great way to write more robust linked-data converters.