Looks great, but I can't see how they can be differentiated (there's no serial/firstbits) is that right?
Thanks.
They will operate very similarly to the Brass/Nickel rainbow coins.
BITCOIN ADDRESS, SERIAL #, AND KEY =========================================
Each individual coin is sold with two copies of the private key. One is printed on paper and the other is put on to the coin itself under the hologram. Both copies of the key are under the respective coin's hologram.
Bitcoin addresses and associated serial #s are also visible on the back of each coin. SEE EXAMPLE BELOW: