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A transaction is valid if nothing in the combined script triggers failure and the top stack item is true (non-zero).
However, P2WPKH and P2WSH scriptPubkeys are two data pushes of witness versions and witness programs with empty scriptsigs spending them. From a pre-segwit client perspective, stack is ending with data pushes which are non-true? If so how do legacy clients evaluate segwit spends true?
In the Bitcoin scripting system, anything that is not explicitly OP_FALSE (0) is implicitly true. Because the top stack elements is not 0, it will be evaluated as true.
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