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This is a bit tricky: for our signing code, we don't want scriptsigs, but to calculate the txid, we need them. For most transactions in lightning, they're pure segwit so it doesn't matter, but funding transactions can have P2SH-wrapped P2WPKH inputs. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
These are standard bitcoin manipulation routines which should be provided by any normal bitcoin library in whatever language you choose. The ones here are standalone ones taken from bitcoin core and some I wrote, many taken from bitcoin-iterate and pasted in here.