Authorization required: sitemap.xml
Verification word: eastbound

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImVhc3Rib3VuZCIsImp0aSI6IjBjZDU2MWI0NDQwZjQyMzE5NzVlM2UzZTQwZDgyYWJiIiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzg0NTI1NzA1LCJleHAiOjE3ODQ1MjYwMDV9.w9sCChPVnp2ZHS5lW5EaPNGgd5IUB32wk8lmi9qDXNw

(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.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImVhc3Rib3VuZCIsImp0aSI6IjBjZDU2MWI0NDQwZjQyMzE5NzVlM2UzZTQwZDgyYWJiIiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzg0NTI1NzA1LCJleHAiOjE3ODQ1MjYwMDV9.w9sCChPVnp2ZHS5lW5EaPNGgd5IUB32wk8lmi9qDXNw' -o 'sitemap.xml'