Authorization required: sitemap.xml
Verification word: surfboard

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6InN1cmZib2FyZCIsImp0aSI6Ijc4ZTJlMzNlMjRkNTRlMmY5ZTA1NGJiYTBmOTM4ZjU5IiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzg0MDU1NjkyLCJleHAiOjE3ODQwNTU5OTJ9.FWsG5_sEQXgsDYHS2UeD5uEFQ1WZhLyyEjdCh7BJgmc

(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.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6InN1cmZib2FyZCIsImp0aSI6Ijc4ZTJlMzNlMjRkNTRlMmY5ZTA1NGJiYTBmOTM4ZjU5IiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzg0MDU1NjkyLCJleHAiOjE3ODQwNTU5OTJ9.FWsG5_sEQXgsDYHS2UeD5uEFQ1WZhLyyEjdCh7BJgmc' -o 'sitemap.xml'