[dbieber]

Here's one possibility. Creating a quoteback could: 1. tell archive.org to create a snapshot of the page 2. store a link both to the human-friendly version of the page and the archive snapshot 3. then the reader's browser (rather than the webpage hosting the quoteback) could verify that the quote is present either at the linked source or at the snapshot of the linked source.

In the happy path (where the quoteback is genuine) the browser could indicate to the user that the quoteback is genuine and the link would take the user to the normal website if it still has the quote, otherwise to the archive snapshot.

In the unhappy path (where the quoteback is disingenuous) the browser could notify the user that the quoteback is disingenuous.

[toomuchtodo]

Great path, a few hundred lines of code, less if you can use the ia python library.