recoginze segrate witness script #1
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I add some changes in script.py, I find that some PKscript in output are illegal, the list(self.script) may cause CScriptInvalidError, I add a try catch sentence.
I also add two functions (is_p2wpkh and is_p2wsh) to recoginze segregate PKscripts, according to the two functions, I also alert the is_unknown function.
I have test the functions aforementioned from genesis block to 620000th block, and all of them worked correctly.