zlacker

I mean I think you could also do this on Mastodon but it would just show a "verified" highlight for amazon s3 in your profile, not that it would get verified as your username.

>>Pxtl+(OP)
No, you can’t. To own s3.amazon.com the HTML on that exact domain and not a sub path needs to have a specific link back to your profile on it.

>>Pxtl+(OP)
I don’t know what specifically you’re speaking of, but for the stuff I know of, Mastodon uses WebFinger, which puts the important stuff inside /.well-known/, and .well-known should be blacklisted as a “username” in any of these sorts of systems, for this very reason. (https://www.rfc-editor.org/rfc/rfc8615 specifies the /.well-known/ path prefix.)