Good morning Rusty and list,

> Your zero-val-OP_TRUE-can't-be-spent-after-same-block SF is interesting,
> but if we want a SF just give us SIGHASH_NOINPUT and we'll not need this
> at all (though others still might).

We might still want this in general in Lightning; for instance we could make 
every funding transaction include such an output.  If it turns out, our initial 
feerate estimate for the funding transaction is low, we can use the `OP_TRUE` 
for fee-bumping.  This is a win for Lightning since the funding transaction ID 
remains the same (even in Decker-Russell-Osuntokun, the trigger transaction is 
signed with `SIGHASH_ALL`, and refers to a fixed funding transaction ID).

Without the `OP_TRUE`-for-fee-bump, we would have to pretend to open a new 
different channel and RBF the old funding transaction with a new higher-feerate 
funding transaction, then keep track of which one gets confirmed deeply (there 
is a race where a miner discovers a block using the older funding transaction 
before our broadcast of the new funding transaction reaches it).

(we could also feebump using the change output of the funding transaction, but 
such a change output might not exist for all funding transactions.)

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