Marked_Money

Is there a way of marking digital coins, so the depositor
can be identified?

>         Is there a way of marking digital coins, so the depositor
> can be identified?

Only if the depositor marks them as such.  The depositor generates the
coin, and gives it to the bank to sign it.  The bank signs it in
exchange for another valid signed token.  The bank can't alter it in any
way, the bank can only sign it.

Matthew J Ghio says:
> >         Is there a way of marking digital coins, so the depositor
> > can be identified?
> 
> Only if the depositor marks them as such.  The depositor generates the
> coin, and gives it to the bank to sign it.  The bank signs it in
> exchange for another valid signed token.  The bank can't alter it in any
> way, the bank can only sign it.

You have the protocol reversed. It is the person who withdraws the
money who blinds a coin. Depositors can indeed be tracked by collusion
between the person minting the coin and the bank, but in practice this
would not be a problem.

Perry