Authorization required: sitemap.xml
Verification word: construct

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImNvbnN0cnVjdCIsImp0aSI6IjU0NDg5MmU1OWIxODQxYWQ4NTUxZTkyNDMyMTM2NTI5IiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzg1MDU1NDg1LCJleHAiOjE3ODUwNTU3ODV9.aAuiFk-ye9dNNBLDwSPPp4tgyBQl9GFAyzJeYzD1ILc

(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.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImNvbnN0cnVjdCIsImp0aSI6IjU0NDg5MmU1OWIxODQxYWQ4NTUxZTkyNDMyMTM2NTI5IiwiaXNzIjoic2VydmVzLmNrMS5tZSIsImF1ZCI6ImF1dGguY2sxLm1lIiwiaWF0IjoxNzg1MDU1NDg1LCJleHAiOjE3ODUwNTU3ODV9.aAuiFk-ye9dNNBLDwSPPp4tgyBQl9GFAyzJeYzD1ILc' -o 'sitemap.xml'