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Cloudflare Image Optimization
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Make an image private

You can require an image to only be accessible with a signed URL token. To make an image private, pass a JSON blob with the requireSignedURLs property set to true at the time you request a one-time upload URL:

curl --request POST \
--url https://api.cloudflare.com/client/v4/accounts/<ACCOUNT_ID>/images/v1/direct_upload \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer <API_TOKEN>' \
--data '{
"requireSignedURLs":"true"
}'

If an image is marked to require signed URLs, it can only be accessed using a signed URL token or using a Variant with Always allow public access property checked.