One concern is that this doesn't seem compatible with Lightning as
currently written. Most relevant is that non-cooperative channel close
transactions in Lightning use OP_CHECKSEQUENCEVERIFY, which references the
sequence field of the txin; if the txin doesn't have a sequence number,
OP_CHECKSEQUENCEVERIFY can't work.
LockByBlock and LockByTime aren't described and there doesn't seem to be
code for them in the PR (186). If there's a way to make OP_CLTV and OP_CSV
work with this new format, please let us know, thanks!
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