对，是技术限制。按比特币地址发送，是把交易注入网络，由收款方从网络上发现它。你们并不直接连接，对方当时也不必在线。
Yes, it's a technical limitation. Sending by bitcoin address enters the transaction into the network and the recipient discovers it from the network. You don't connect directly with them and they don't have to be online at the time.
我非常想找到附带一条短消息的办法，但问题在于，全世界都能看到这条消息。无论你怎样反复提醒人们这条消息毫无隐私可言，迟早还是会有人因此出问题。
I very much wanted to find some way to include a short message, but the problem is, the whole world would be able to see the message. As much as you may keep reminding people that the message is completely non-private, it would be an accident waiting to happen.
遗憾的是，ECDSA 只能用于签名，不能加密消息，而我们需要的正是 ECDSA 的小体积。RSA 能加密消息，却比 ECDSA 大上好多倍。
Unfortunately, ECDSA can only sign signatures, it can't encrypt messages, and we need the small size of ECDSA. RSA can encrypt messages, but it's many times bigger than ECDSA.
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