@alex absolutely 100% agree. decentralised-nomadic identity is the foundational piece of federation that is missing for the fediverse. Hubzilla has their Zot protocol that solves this (apparently, i have yet to try it) but they're also the only software that implements it.
i really really want something capable of solving this problem fediverse wide, but that is a massive undertaking
Cybrespace is an instance of Mastodon, a social network based on open web protocols and free, open-source software. It is decentralized like e-mail.