[13220] in Cypherpunks
Re: Marked_Money
daemon@ATHENA.MIT.EDU (Perry E. Metzger)
Fri May 6 07:17:53 1994
To: Matthew J Ghio <mg5n+@andrew.cmu.edu>
Cc: cypherpunks@toad.com
In-Reply-To: Your message of "Thu, 05 May 1994 21:45:10 EDT."
<whmO4aK00awHAs6EZr@andrew.cmu.edu>
Reply-To: perry@imsi.com
Date: Fri, 06 May 1994 07:15:42 -0400
From: "Perry E. Metzger" <perry@snark.imsi.com>
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
