Except in other contexts, the use of the public and private keys is reversed. I use my private key to generate signatures: does it aid understanding to tell someone to use my "lock" to verify such signatures?

Just tell the user he can't sign things without a profile, and make keys with each profile.

good point

but maybe this is a different thing conceptually i think i would call that a stamp or a seal ..sort of like a wax imprint of a key