You may have seen Perma.cc links in a number of documents of current interest, including the Trial Memorandum of the U.S. House of Representatives in the Impeachment Trial of President Donald J. Trump (archived at https://perma.cc/BG56-2KXH) and the Trial Memorandum of President Donald J. Trump (archived at https://perma.cc/XG5W-KRQF). Interestingly, both documents cite Perma links without citing the original URL that Perma archived; generally, you would include both in your citation.

As an exercise, I used Perma's public API to look up the URLs for the Perma links cited in these two documents; here are CSV files listing the 148 links in the House Memorandum (one ill-formed) and the 129 links in the President's memorandum. (Note that both CSV files include duplicates, as some links are repeated in each document; I'm leaving the duplicates in place in case you want to read along with the original documents.)