Data and methods

• /data/promises.json
  All registry entries with year, system, sources, verification level and date checked (JSON).
• /data/promises.csv
  The same registry entries as a table for spreadsheets (CSV).
• /data/signals.json
  Dated early signals, each with what would confirm or refute it and the next review date (JSON).
• /data/dossiers.json
  City dossiers: research question, conditions for transfer, what remains unknown, sources (JSON).
• /data/search-en.json
  The search index used by site search and by the page “Ask the registry” (JSON, one file per language).
• /en/feed.xml
  RSS feed of the edition log (one feed per language).
• /sitemap.xml
  Lists of pages for search engines and for AI crawlers (sitemap.xml, llms.txt).

/llms.txt

• “Read on source” means the editors read the figure on the named source page. “Headline level” means it was taken from a headline or summary and has not yet been read in the full document.
• Every entry names its source and the date it was last checked. A plan is recorded as a plan; a result is recorded only when a source reports it.
• There are no scores and no rankings. One number can describe different boundaries, years and methods, so entries are never combined into a league table.
• The sources are re-read on the 6th of each month. Some publishers block automatic access; those pages are read by hand rather than by a script, and the date checked changes only after they have been read.

You may reuse the registry files with attribution to CITIES GLOBALLY UNITED and a link to the page of the entry. The sources keep their own terms. When you cite an entry, cite its source as well, together with the date checked shown in the file.

The texts were drafted in English and translated into five languages with the help of AI. The translations were then checked by independent back-translation: each text was translated back into English without seeing the original, and every difference in meaning was corrected. This is not the same as review by native speakers, which has not yet taken place; if you notice an error, please tell us through the feedback page.

How we use AI ↗

The images are illustrations created with AI; they are not photographs of real events or of existing plans. For sharper detail on large screens they were enlarged with a neural super-resolution model, which adds plausible texture rather than recovering real detail.

If an entry is wrong, outdated or missing a source, write to us with the link to the entry and the document that shows it. Corrections are listed in the edition log.