Why ecash is traceable

[Tom Rollins]

Pat Farrell says:
> Because you lose most (all?) anonymous abilities. (I think) 
> So when the money Alice gave to Bob gets deposited by TCMay,
> That it was Alice's is instantly known. This is not how physical cash works.
> 
> There is a chain from TCMay through some number of steps to Bob.
> Even if you can't find it with this single case, you could use
> a zero-knowledge type proof to slowly uncover Bob's identity.
> 
> I keep wanting to believe in ecash, but I'm not convinced
> it can exist.

Just a little humor...
Perhaps Electronic Cash has a sound.
Phone Phreakers have something called a Redbox.
This device makes the sound of a quarter.
When an ATT pay phone asks you to deposit $1.75
you just make the sound of 7 quarters... :)