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EU : Our commitment to the fediverse is here to stay.
(social.network.europa.eu)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
He's right that the public key would have to be somewhere, maybe on the profile page. The public key would be one more thing to be federated across servers.