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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.