rsync.net Warrant Canary
www.rsync.net/resources/notices/canary.txt
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
rsync.net will also make available, weekly, a "warrant canary" in the form of a cryptographically signed message containing the following: a declaration that, up to that point, no warrants have been served, nor have any searches or seizures taken place; a cut and paste headline from a major news source, establishing date. Special note should be taken if these messages ever cease being updated, or are removed from this page.