Although I understand the desire to use more human-friendly terms than
scriptPubKey, scriptSig, redeemScript, witness program, and witness, I
think it makes things less clear, particularly when we switch from
legacy to legacy P2SH to segwit v0 to segwit v1.
An additional problem is that, with scriptSig no longer being executed
(and witnesses never being executed), it's not quite accurate to use the
phrase "unlocking script".
This commit replaces "locking script" and "unlocking script" with either
the specific data type or with non-specific phrasing.
This chapter, containing parts of previous chapters 6 and 7, is almost
entirely rewritten.
- Instead of introducing concepts in a somewhat arbitrary order, almost
every section except the last three (coinbase txes, weight, and legacy
serializitaion) follows the order of transaction fields as seen in
a P2P serialized transaction.
- We leave details of scripts for the next chapter (authorization &
authentication), signatures for the chapter after that, and fees and
fee bumping for the chapter after that (reflecting the increased
importance of fees).
