All the sender does is present his identity. The recipient's postage
meter issues a stamp which is only good for sending one message to that
recipient. The sender's "coin" has to come from a bank trusted by the
recipient [...]
But can we please stop arguing from the assumption that senders can
arbitrarily print and re-use one stamp for many recipients?
In the scenario above, what happens when a sender buys one coin and
simultaneously presents it to 1000 recipients?
R's,
John
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