[p2p-research] 比特币：点对点货币的开源实现
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Martien van Steenbergen 写道：
非常有趣。这是否类似于 David Chaum 的匿名数字货币？ 他的概念确保货币在未被攻破前保持匿名，也就是除非同一笔钱被花费超过一次。 一旦被攻破，“伪造者”就会立即被公开揭露。
它在使用数字签名来表示货币这一点上相似，但在隐私和防止双重支付的方式上不同。比特币付款的收款人可以检查这是否是第一次支付，第二次支付不会被接受。这里没有一种离线模式，可以在事后抓住并羞辱双重支付者，因为那要求参与者拥有身份。
为了保护隐私，密钥对只使用一次，每笔交易都使用新的密钥对。货币的所有者就是拥有其私钥的人。
当然，最大的区别是没有中央服务器。这是 Chaum 系统的致命弱点；当中央公司关闭时，货币也随之停止运行。
另外，在比特币中，货币供应量是有限的（必须加以管理）吗？还是说货币恰好在交易发生时生成？
货币供应量是有限的。流通量将是 21,000,000 枚。交易只会转移所有权。
感谢你的问题，
中本聪
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Martien van Steenbergen wrote:
Very interesting. Is this akin to David Chaum's anonymous digital money? His concept makes sure money is anonymous unless it is compromised, i.e. the same money spent more than once. As soon as it's compromised, the ‘counterfeiter’ is immediately publicly exposed.
It's similar in that it uses digital signatures for coins, but different in the approach to privacy and preventing double-spending. The recipient of a Bitcoin payment is able to check whether it is the first spend or not, and second-spends are not accepted. There isn't an off-line mode where double-spenders are caught and shamed after the fact, because that would require participants to have identities.
To protect privacy, key pairs are used only once, with a new one for every transaction. The owner of a coin is just whoever has its private key.
Of course, the biggest difference is the lack of a central server. That was the Achilles heel of Chaumian systems; when the central company shut down, so did the currency.
Also, in bitcoin, is there a limited supply of money (that must be managed)? Or is money created exaclty at the moment of transaction?
There is a limited supply of money. Circulation will be 21,000,000 coins. Transactions only transfer ownership.
Thank you for your questions,
Satoshi