It is normal to have more than one key: one in Nanodash, one on each machine you script from, one for a bot you run. Each has its own introduction and its own approval, and all of them are yours. Roles in spaces are granted to you, not to a key, so they apply whichever key you sign with — as long as that key is approved.

Bots are the exception: a bot is its own agent with its own identity and roles, owned by you rather than being you.