"Banks" would be compensated by debiting a customer account more
than the amount of ePostage issued and/or crediting a customer
account less than the amount redeemed. Or, perhaps there would be a
per-transaction fee (in the thousandths of cents, presumably). I
see no role for IETF in saying which model a "bank" uses.
So "thousandths of cents" doesn't seem realistic language when
discussing a per-transaction fee.
I did a similar calculation for my white paper, and even a penny a
message isn't enough, particularly if you have to budget for large
numbers of spams with fake or duplicate postage that will require most
of the work of verifying a real stamp, but provide no revenue.
I hear that a lot of research involves models. Perhaps a model of
where the money will have to go would be useful.
R's,
John
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