“HUGE Google Search Document Leak Reveals Inner Workings of Ranking Algorithm: The Documents Reveal How Google Search Is Using, or Has Used, Clicks, Links, Content, Entities, Chrome Data and More for Ranking.”, Danny Goodwin2024-05-28 (Internet archiving, Google)⁠:

[more] …Thousands of documents, which appear to come from Google’s internal Content API Warehouse, were released March 13 on Github by an automated bot called yoshi-code-bot. These documents were shared with Rand Fishkin, SparkToro co-founder, earlier this month.

…Change history: Google apparently keeps a copy of every version of every page it has ever indexed. Meaning, Google can “remember” every change ever made to a page. However, Google only uses the last 20 changes of a URL when analyzing links.

[Confirmation of long-standing rumors about Google having a secret full history of the Internet]