prepare
fun prepareForSigning( tx: Transaction, inputIndex: Int, previousOutputScript: ByteArray, sighashType: Int): Transaction
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prepare a transaction for signing a specific input
Return
a new transaction with proper inputs and outputs according to SIGHASH_TYPE rules
Parameters
tx
input transaction
input
index of the tx input that is being processed
previous
public key script of the output claimed by this tx input
sighash
signature hash type