你好，中本聪：
Hi Satoshi,
我给你发了 32.51 枚币，我的比特币地址是 1JuEjh9znXwqsy5RrnKqgzqY4Ldg7rnj5n
I sent you 32.51 coins, my bitcoin address is 1JuEjh9znXwqsy5RrnKqgzqY4Ldg7rnj5n
我目前的 IP 是 84.73.233.199，不过这是一台笔记本电脑，你处理这封邮件时，它不一定在线。我建议改用比特币地址。如果间接转账也能使用同样的备注功能，会很方便。能不能用收款人的公钥加密备注，再把它放进区块里？
My IP is currently 84.73.233.199, however, it's a laptop so may or may not be online at the time you act on this mail. I suggest using the bitcoin address instead. It'd be convenient if the same comment functionality was available via indirect transfer. Can the comment be encrypted using the public key of the receiver and placed into a block?
我转回了 32.51 和 50.00。
I sent back 32.51 and 50.00.
我非常想找到一种办法，在间接转账中附带备注，但实在没有办法。比特币使用 EC-DSA，这对让区块链足够紧凑、能在当今技术条件下实际使用至关重要，因为它的签名比 RSA 小一个数量级。但 EC-DSA 不能像 RSA 那样加密消息，只能用来验证签名。
I badly wanted to find some way to include a comment with indirect transfers, but there just wasn't a way to do it. Bitcoin uses EC-DSA, which was essential for making the block chain compact enough to be practical with today's technology because its signatures are an order of magnitude smaller than RSA. But EC-DSA can't encrypt messages like RSA, it can only be used to verify signatures.
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Satoshi to Mike Hearn on ECDSA curve choice (April 18, 2009)
