This reminds me of the near-ish-future "Rainbow's End" by Vernor Vinge, wherein instead of giving out phone numbers or email addresses or screen names (identifiers), people give out opaque GUIDs [0] that act as communication handles with capabilities baked in. So, you could give out one to friends that allows people to open a synchronous voice channel to you, but give out one on your business card that just allows people to send text messages to you.
The book doesn't talk about it too much, but presumably these handles could be limited-use (time-based or only granting a capability to send a certain number of messages) and could be revoked.
I know it would probably be off-putting to give each person I meet a different GUID for contacting me (kind of like telling them your email address is <their_name>@<my_vanity_domain>), but it might reduce the spam I receive.
[0] if you're searching the ebook, they're called "golden enums" in the text
The book doesn't talk about it too much, but presumably these handles could be limited-use (time-based or only granting a capability to send a certain number of messages) and could be revoked.
I know it would probably be off-putting to give each person I meet a different GUID for contacting me (kind of like telling them your email address is <their_name>@<my_vanity_domain>), but it might reduce the spam I receive.
[0] if you're searching the ebook, they're called "golden enums" in the text