npub1ryfc4qst6y3m8r3ku2l2vvekw06gqjrmj4mqr704vk2mwtqnx0qqptevtf (npub1ryf…evtf) npub174w2p4f6xwgvh05yyznqf2uql96skuj920f0qwhm2tl7fwe7zh3q2efaqj (npub174w…faqj)
I think Hubzilla and Streams did it they call it magic authentification. You can jump from site to site without authentification buy mastodon didn't do it