什么是比特币消息签名？
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使用私钥对数据进行签署(Sign)会得到签名(Signature)。通常会将数据先生成Hash值，然后对此Hash值进行签名。签名(signature)有两部分组成: R + S。由签名(signature)与Hash值，便可以推出一个公钥，验证此公钥，便可知道此签名是否由公钥对应的私钥签名。
通常，每个签名会有三个长度：73、72、71，符合校验的概率为25%、50%、25%。所以每次签署后，需要找出符合校验的签名长度，再提供给验证方。
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