Authorization required: sitemap.xml
Verification word: nucleus

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6Im51Y2xldXMiLCJqdGkiOiIzZTJkZmY2MTI4MzU0OGY4ODgzNjVjMWMyOGI0NTk3ZCIsImlzcyI6InNlcnZlcy5jazEubWUiLCJhdWQiOiJhdXRoLmNrMS5tZSIsImlhdCI6MTc4MzkxOTI0MiwiZXhwIjoxNzgzOTE5NTQyfQ.uXnEhDlxNGbXtz_b8vAqUB-rp7YLssHLhrGukzEnKHE

(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.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6Im51Y2xldXMiLCJqdGkiOiIzZTJkZmY2MTI4MzU0OGY4ODgzNjVjMWMyOGI0NTk3ZCIsImlzcyI6InNlcnZlcy5jazEubWUiLCJhdWQiOiJhdXRoLmNrMS5tZSIsImlhdCI6MTc4MzkxOTI0MiwiZXhwIjoxNzgzOTE5NTQyfQ.uXnEhDlxNGbXtz_b8vAqUB-rp7YLssHLhrGukzEnKHE' -o 'sitemap.xml'