Authorization required: sitemap.xml
Verification word: liability

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImxpYWJpbGl0eSIsImp0aSI6IjAxZDE1OWFiOGIxNDQ3OGRiMDAwNDRjYmM2ZjE4MzFmIiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzkzMDkzMDk0LCJleHAiOjE3OTMwOTMzOTR9.gWY6TJ0wr5-Bv2JE4yIZHuZKm4wzuVfJccimCCaStOs

(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.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImxpYWJpbGl0eSIsImp0aSI6IjAxZDE1OWFiOGIxNDQ3OGRiMDAwNDRjYmM2ZjE4MzFmIiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzkzMDkzMDk0LCJleHAiOjE3OTMwOTMzOTR9.gWY6TJ0wr5-Bv2JE4yIZHuZKm4wzuVfJccimCCaStOs' -o 'sitemap.xml'