原始文献 / 邮件 / [p2p-research] Bitcoin open source implementation of P2P currency
[p2p-research] Bitcoin open source implementation of P2P currency
P2P Research List · 2009-02-12 19:08:24 UTC
Martien van Steenbergen 写道：
> 非常有意思。这和 David Chaum 的匿名数字货币类似吗？
> 他的概念确保了货币是匿名的，除非它被攻破，也就是
> 同一笔钱被花费不止一次。一旦被攻破，
> “伪造者”就会立刻被公开揭露。
它在这一点上是类似的：都使用数字签名来表示币，但在隐私和防止双重支付的
方法上有所不同。比特币支付的接收方可以检查这笔支付是否是首次
支出，而第二次支出不会被接受。不存在一种离线模式，让双重支付者在事后
被抓出来示众，因为这要求参与者拥有身份。
为了保护隐私，每对密钥只使用一次，每笔交易
都使用一对新的密钥。币的所有者就是持有其私钥的人。
当然，最大的区别在于没有中央服务器。这是 Chaumian 系统的
阿喀琉斯之踵；当中央公司倒闭时，货币也就随之终结了。
另外，在比特币中，货币供应量是有限的吗（需要
管理）？还是说货币恰好在交易发生的瞬间被创造？
货币供应量是有限的。流通量将是 21,000,000 币。交易
只转移所有权。
感谢你的提问，
Satoshi
http://www.bitcoin.org
英文原文
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
http://www.bitcoin.org