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It is possible to accomplish your goal, but unfortunately probably not in any way that will help you. For example, consider the following policies: Email Provider: Each person must only register for a single email address. Country Government: Each person must only obtain one passport. Typically the Email policy is easy to circumvent, and the Passport ...


This is impossible (or, if you really want to nitpick, it can't be done usefully). Proof: suppose that you were able to detect when one node generates two identities. An entity wants to carry out the attack that the unicity of identity prevents. That entity can create two distinct nodes and have them cooperate to carry out the attack. You can apply ...


If you're using oAuth with Facebook or Google you will be issued an "access token" for the user to access your application. This access token will have an expiry. Once it is expired, you should use a "refresh token" to ask for another "access token" for the user. If this is not granted, this is when you should logout the user.


I suppose you could inject a fireproof password protected RFID Java card in your bones, which contains a private key. If you go to buy a Gatorade at a gas station, the cashier could query for your public key (based on your name) in a blockchain database (perhaps Ethereum or any one of the several others; distributed/tamperproof in general, but vulnerable to ...

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