What is the witness version and how is it used?
A segwit transaction is comprised of: [nVersion][marker][flag][txins][txouts][witness][nLockTime]
From the BIP: “A witness field starts with a var_int to indicate the number of stack items for the txin.”
Where does the witness version come in and in what scenarios can it be used?
Secondly, why does it say witness field starts with a var_int to indicate the number of stack items for the txin — isn’t witness data just signature? Or it simply refers to transactions that have more inputs, and the leading var_init just counts the number of inputs, thus signatures expected?
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