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@argumatronic The other major federated services where personal identity is important are e-mail and IRC.

E-mail identity management consists of sending your new address to all your contacts and hoping they change it in their address book. I'm in the process of moving my e-mail out of the U.S. and I can tell you it takes several reminders to get it done.

IRC solves this problem by centralizing identity verification with NickServ. This only works because IRC has a single namespace for nicks.