求大神给讲讲签名部分

我在读这篇文章

Steem transaction signing in a nutshell

但是这部分有些看不懂
the back-end only accepts canonical signatures and we have no way of knowing if the signature that is going to be produced will be canonical

意思是系统只接收规范签名

然后它用一个自增变量循环生成一个K参数
然后在用这个k参数去签名
然后大致是这部分代码

有些搞不懂什么是规范签名(canonical signatures)?如何判断?
查了一下云山雾罩的

if lenR is 32 and lenS is 32 :
lenR和lenS 都等于32就是规范签名?

先谢过了。


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