mastodon.zunda.ninja is one of the many independent Mastodon servers you can use to participate in the fediverse.
Zundon is a single user instance as home of @zundan as well as a test bed for changes of the code.

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zunda

@Sujiyan Yep. My experience tells me that I could re-follow an account with the same @username@FQDN recovered on a totally independent installation of Mastodon.

@zundan So you mean a cryptographic UUID is needed?

@Sujiyan No. I guess this just means Mastodon is designed to identify accounts with just their URI (username@FQDN). Key pairs are only for verifying the authors when posts are transferred between servers.

To verify a Mastodon account from something else, one can add a hyperlink from there back to the profile page on Mastodon with rel="me" attribute.