回复：建议：允许在发送比特币的同时发送短消息？
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ECDSA 不能加密消息，只能签署签名。
让明文消息永久记录下来供所有人查看是不明智的。这是在等着出事。
如果要有消息系统，它应该是一个与比特币网络并行的独立系统。消息不应记录在区块链中。可以使用比特币地址的密钥对给消息签名，以证明消息来自谁。
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ECDSA can't encrypt messages, only sign signatures.
It would be unwise to have permanently recorded plaintext messages for everyone to see. It would be an accident waiting to happen.
If there's going to be a message system, it should be a separate system parallel to the bitcoin network. Messages should not be recorded in the block chain. The messages could be signed with the bitcoin address keypairs to prove who they're from.