Authorization required: sitemap.xml
Verification word: contend

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImNvbnRlbmQiLCJqdGkiOiI2M2RjZGU0NGU2MGI0MDgyODViZGE5OGNjMGU0NWNhYSIsImlzcyI6InNlcnZlcy5jazEubWUiLCJhdWQiOiJhdXRoLmNrMS5tZSIsImlhdCI6MTc4NDQ5NzQ2NCwiZXhwIjoxNzg0NDk3NzY0fQ.WmpinXejQpIYSaHE9K2TbNsNp05MISN6v-FDEUNcJiA

(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.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImNvbnRlbmQiLCJqdGkiOiI2M2RjZGU0NGU2MGI0MDgyODViZGE5OGNjMGU0NWNhYSIsImlzcyI6InNlcnZlcy5jazEubWUiLCJhdWQiOiJhdXRoLmNrMS5tZSIsImlhdCI6MTc4NDQ5NzQ2NCwiZXhwIjoxNzg0NDk3NzY0fQ.WmpinXejQpIYSaHE9K2TbNsNp05MISN6v-FDEUNcJiA' -o 'sitemap.xml'