Authorization required: sitemap.xml
Verification word: unstuffed

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6InVuc3R1ZmZlZCIsImp0aSI6IjgzZTE5Y2RlMzVjMTRkZjFiNzM4MDA3NDI2NThiNDYxIiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzgzMjMwMjYxLCJleHAiOjE3ODMyMzA1NjF9.fYmoJTcrX1QiJ5HyrTDgbxNEnvcN94vL_kCUSFx7DBc

(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.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6InVuc3R1ZmZlZCIsImp0aSI6IjgzZTE5Y2RlMzVjMTRkZjFiNzM4MDA3NDI2NThiNDYxIiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzgzMjMwMjYxLCJleHAiOjE3ODMyMzA1NjF9.fYmoJTcrX1QiJ5HyrTDgbxNEnvcN94vL_kCUSFx7DBc' -o 'sitemap.xml'