Authorization required: sitemap.xml
Verification word: sprite

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6InNwcml0ZSIsImp0aSI6ImFiMTljYTdmMWY1YjQxZjhhOTQzYzYyNTIyYjEyZDUzIiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzg1OTMzMTc5LCJleHAiOjE3ODU5MzM0Nzl9.j6ZvEu-W6j1FDP1tqNHe5df4K1AWr3GWM3pEfdZAP_8

(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.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6InNwcml0ZSIsImp0aSI6ImFiMTljYTdmMWY1YjQxZjhhOTQzYzYyNTIyYjEyZDUzIiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzg1OTMzMTc5LCJleHAiOjE3ODU5MzM0Nzl9.j6ZvEu-W6j1FDP1tqNHe5df4K1AWr3GWM3pEfdZAP_8' -o 'sitemap.xml'