Niue (.nu.contact)
Use one long access key. No email, no phone, no personal details.
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Access key
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Create new key
domain:key:4MTEz6qQwMgHhaMyd7VbuSSG4fwZNbcLqB3w
Create key and login
Generate another key
Save this key. It is the only way to access your balance on any site in the system.