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This was the first serious digital cash proposal. It works, but it still requires a server run by a central authority, such as a bank, and for everyone to trust that entity. Moreover, every transaction needs the participation of this server to be completed. If the server goes down temporarily, payments grind to a halt. A few years later, in 1988, Chaum in collaboration with two other cryptographers, Amos Fiat and Moni Naor, proposed offline electronic cash. At first sight, this might seem impossible: if you try to spend the same digital note or coin at two different shops, how can they possibly stop this double spend unless they’re both connected to the same payment network or central entity?
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发表于 2022-7-5 16:54
