Idea: up-to-date business card

[Ole Tange]

If I receive a business card it sometimes happens I try to call a year
later. At that point the person has a new phone number and I will have
to look that up. I would much rather receive an intelligent business
card that was always up to date.

To secure anonymity we will need a protocol that will allow me to get
the new information without everyone knowing I got that. It will be OK
if the original person is informed. Maybe using some kind of web of
trust?

/Ole