nostr:npub10940z6cfs9wndhte7mkgw7tw79k68pp5z0k84weuph5swvsrn2xqrm2wum Hi! Your website has been so useful to me. Thank you! One thing I’m unclear on: Is my username unique *across* the Fediverse?

e.g: I am riocarmine [at] mastodon.social but could someone else be riocarmin [at] some other instance? Thanks for your help.