Authorization required: sitemap.xml
Verification word: grievous

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImdyaWV2b3VzIiwianRpIjoiNDM5MDM2ODRjOTAyNGM3OWEyOWM2NDMyYzk4MmFkODkiLCJpc3MiOiJzZXJ2ZXMuY2sxLm1lIiwiYXVkIjoiYXV0aC5jazEubWUiLCJpYXQiOjE3ODQ5MTAzNjUsImV4cCI6MTc4NDkxMDY2NX0.DhTHfqLO1IB-QVMG_JXE_iPWwK65faQhDHbjW8eXqJk

(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.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImdyaWV2b3VzIiwianRpIjoiNDM5MDM2ODRjOTAyNGM3OWEyOWM2NDMyYzk4MmFkODkiLCJpc3MiOiJzZXJ2ZXMuY2sxLm1lIiwiYXVkIjoiYXV0aC5jazEubWUiLCJpYXQiOjE3ODQ5MTAzNjUsImV4cCI6MTc4NDkxMDY2NX0.DhTHfqLO1IB-QVMG_JXE_iPWwK65faQhDHbjW8eXqJk' -o 'sitemap.xml'