> > Think cash is a stupid idea, and won't work in practice. You don't > want to be trying to solve puzzles when you really just want to send > your email or post messages.
There are only two ways I can think of to have a communications system with a public address that isn't mechanically spammable: 1) Think Cash. BTW, I don't really agree that they wont work in practice, you can make a puzzle that is trivial for a human but difficult for a machine. Not just trivial, but even fairly non-intrusive.
