Ah makes more sense thanks. iirc mastadon doesn't have much of an identity migration story, except for using domain control as proof of identity which is kinda neat. I still like DNS and TLDs as a pay-to-play distributed namespace if you're going to have a persistent identity that can travel from server to server, and change hands as property from one owner to another. (I think there is case law on domain names being property, somewhat unique in cyberspace)