Authorization required: sitemap.xml
Verification word: stainable

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6InN0YWluYWJsZSIsImp0aSI6IjY3ZjY5MzRmMThlMzRjMjQ5MzAyM2I2NjIyNzVlMmE2IiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzg0NDQwMzExLCJleHAiOjE3ODQ0NDA2MTF9.xpEF8xQinCLCGO7E4-bV56_5GPRJJbavVpWhabj__KQ

(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.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6InN0YWluYWJsZSIsImp0aSI6IjY3ZjY5MzRmMThlMzRjMjQ5MzAyM2I2NjIyNzVlMmE2IiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzg0NDQwMzExLCJleHAiOjE3ODQ0NDA2MTF9.xpEF8xQinCLCGO7E4-bV56_5GPRJJbavVpWhabj__KQ' -o 'sitemap.xml'