Points to an RSL licence (robots.txt License line or Link header)
no
Answers with an x402 payment offer (lower bound: only the homepage is probed)
no
Answers HTTP 402 Payment Required (lower bound: only the homepage is probed)
no
Sends noai / noimageai directives
no
Refused our fetcher (403 / challenge)
no
robots.txt as recorded sha256 f905f4c8680c3364…
#
# robots.txt
#
# This file is to prevent the crawling and indexing of certain parts
# of your site by web crawlers and spiders run by sites like Yahoo!
# and Google. By telling these "robots" where not to go on your site,
# you save bandwidth and server resources.
#
# This file will be ignored unless it is at the root of your host:
# Used: http://example.com/robots.txt
# Ignored: http://example.com/site/robots.txt
#
# For more information about the robots.txt standard, see:
# http://www.robotstxt.org/robotstxt.html
User-agent: *
# CSS, JS, Images
Allow: /core/*.css
Allow: /core/*.js
Allow: /core/*.gif
Allow: /core/*.jpg
Allow: /core/*.jpeg
Allow: /core/*.png
Allow: /core/*.svg
Allow: /profiles/*.css
Allow: /profiles/*.js
Allow: /profiles/*.gif
Allow: /profiles/*.jpg
Allow: /profiles/*.jpeg
Allow: /profiles/*.png
Allow: /profiles/*.svg
# Directories
Disallow: /core/assets/vendor/
Disallow: /core/config/
Disallow: /core/includes/
Disallow: /core/lib/
Disallow: /core/modules/
Disallow: /core/profiles/
Disallow: /core/scripts/
Disallow: /core/tests/
Disallow: /core/themes/
Disallow: /misc/
Disallow: /tmp/
Disallow: /cache/
# Documentation
Disallow: /README.md
Disallow: /composer/
Disallow: /modules/README.txt
Disallow: /sites/README.txt
Disallow: /themes/README.txt
# Temps and logs
Disallow: /*.log
Disallow: /*.bak
Disallow: /*.sql
# Paths (clean URLs)
Disallow: /admin/
Disallow: /comment/reply/
Disallow: /filter/tips
Disallow: /node/add/
Disallow: /search/
Disallow: /user/register
Disallow: /user/password
Disallow: /user/login
Disallow: /user/logout
Disallow: /media/oembed
Disallow: /*/media/oembed
# Paths (no clean URLs)
Disallow: /index.php/
Disallow: /index.php/admin/
Disallow: /index.php/comment/reply/
Disallow: /index.php/filter/tips
Disallow: /index.php/node/add/
Disallow: /index.php/search/
Disallow: /index.php/user/password
Disallow: /index.php/user/register
Disallow: /index.php/user/login
Disallow: /index.php/user/logout
Disallow: /index.php/media/oembed
Disallow: /index.php/*/media/oembed
# Bloquer les pages filtrées avec des paramètres vides ou génériques
Disallow: /*?field_topic_type_tid=
Disallow: /*?thematique_id=All
Disallow: /*?page=
Disallow: /news-list-filtered?field_topic_type_tid=All&thematique_id=All
# Specific, historic
Disallow: /institut_
# Sitemap
Sitemap: https://www.cnrs.fr/sitemap.xml
# Cadence (indicative selon bots)
Crawl-delay: 2
From Common Crawl's robots.txt captures: what CCBot was served, one crawl per quarter. A separate series from the daily observations above; a 403 here means Common Crawl was refused, not this ledger.
Every daily observation of cnrs.fr is a leaf in that day's Merkle tree. Proof of the robots.txt line for 2026-10-27: audit path (JSON), day root and OpenTimestamps proof (complete (bitcoin block 973493)).