Authorization required: sitemap.xml
Verification word: explore

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImV4cGxvcmUiLCJqdGkiOiIxZmI0OTBlOTdkYjQ0NWZkYmZjZWFjODhmNmY5YTBmOSIsImlzcyI6InNlcnZlcy5jazEubWUiLCJhdWQiOiJhdXRoLmNrMS5tZSIsImlhdCI6MTc5MzA0MzA5NywiZXhwIjoxNzkzMDQzMzk3fQ.4VrHq2zWQxg-3CUW2sv2a-t0-suPx8qWlxcDRwSJxns

(No browser on this box? Cmd-click that link to open it on your laptop;
 it shows a QR you can scan with your phone.)

Then fetch the file -- this command waits until you approve:
  curl -fL 'https://serves.ck1.me/sitemap.xml?grant=eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImV4cGxvcmUiLCJqdGkiOiIxZmI0OTBlOTdkYjQ0NWZkYmZjZWFjODhmNmY5YTBmOSIsImlzcyI6InNlcnZlcy5jazEubWUiLCJhdWQiOiJhdXRoLmNrMS5tZSIsImlhdCI6MTc5MzA0MzA5NywiZXhwIjoxNzkzMDQzMzk3fQ.4VrHq2zWQxg-3CUW2sv2a-t0-suPx8qWlxcDRwSJxns' -o 'sitemap.xml'