Authorization required: sitemap.xml
Verification word: gaining

Approve on your phone -- open or scan this on a device with your passkey:
  https://auth.ck1.me/a/eyJhbGciOiJIUzI1NiJ9.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImdhaW5pbmciLCJqdGkiOiJjN2E0OTA0MTMxODM0MTk3YjE2N2E5Yjc3M2U0MDliZCIsImlzcyI6InNlcnZlcy5jazEubWUiLCJhdWQiOiJhdXRoLmNrMS5tZSIsImlhdCI6MTc4Mjc0NDE0OCwiZXhwIjoxNzgyNzQ0NDQ4fQ.xk5JWMDk07o2H45JCRJJV7Ub_kG3qrkT5FE_WThdSJU

(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.eyJyZXMiOnsidHlwZSI6Im9iamVjdCIsImlkIjoic2l0ZW1hcC54bWwifSwid29yZCI6ImdhaW5pbmciLCJqdGkiOiJjN2E0OTA0MTMxODM0MTk3YjE2N2E5Yjc3M2U0MDliZCIsImlzcyI6InNlcnZlcy5jazEubWUiLCJhdWQiOiJhdXRoLmNrMS5tZSIsImlhdCI6MTc4Mjc0NDE0OCwiZXhwIjoxNzgyNzQ0NDQ4fQ.xk5JWMDk07o2H45JCRJJV7Ub_kG3qrkT5FE_WThdSJU' -o 'sitemap.xml'