Tweetkeep proof for X post 878376539477487619 by @citizenlab
https://x.com/citizenlab/status/878376539477487619
First archived 2026-10-22 13:31 UTC

Post text, saved 2026-10-22 13:31 UTC
  File     https://tweetkeep.com/proof/878376539477487619/text
  SHA-256  d3b4d2571a89b1f115f3757ad6493690c7de9b2d773db0b51e66ae44c18d08a6
  Listed in https://tweetkeep.com/data/proofs/2026-10-22T1350.txt
  Bitcoin timestamp of that list: https://tweetkeep.com/data/proofs/2026-10-22T1350.txt.ots

X's own data for this post as it reached our browser, as WARC records (open with any WARC tool, e.g. https://replayweb.page):
  2026-10-22 13:31 UTC  https://tweetkeep.com/warc/3067.warc.gz
    SHA-256  e6a59d9d6ba16024500f71f2657e2502d468548e2a1dde65fce5536046649d51
    Listed in https://tweetkeep.com/data/proofs/2026-10-22T1350.txt

No Internet Archive copy: we ask it for a few hundred fresh posts a day, from the accounts that delete the most. X's data for every post is in the WARC records above.

How to check:
1. Download a file above and run: shasum -a 256 <file>. It must print the SHA-256 shown, and that hash must appear in the list.
2. Drop the list and its .ots file on https://opentimestamps.org, or run: ots verify <list>.ots
   That proves the list, and every file whose hash it holds, existed unchanged by then. Fresh timestamps reach Bitcoin within hours.
More: https://tweetkeep.com/faq#proof