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option_will_fund: liquidity ads #878

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option_will_fund: liquidity ads #878

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Commits on Feb 13, 2024

  1. option_will_fund 

    Draft of option_will_fund, to allow for liquidity ads
    @niftynei
    niftynei committed Feb 13, 2024
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  2. CSV -> CLTV 

    Re-write the spec to use CLTV instead of CSVs for liquidity ads.

This does a number of wonderful things.

First, it decouples us from option_anchor, which is returned to being
optional again.

Second, it allows us to have a static, lifetime value for the lease
which doesn't need to be removed at lease end (it is automatically moot
just by passing the required blockheight)

Thirdly, we add a new 'second stage' transaction type for HTLC output
clauses which pay out to the remote node. These are only added to the
*lessor*'s commitment transactions, as we can simply add the required
CLTV locks to HTLC transaction outputs in the lessor's commitment.

There's no such affordance in the commitment transaction of the leassor,
unfortuantely, in which case we must add them.

As written, note that these live for the lifetime of the channel.

We could optionally remove them upon request of the lessor at some point
after the CLTV has passed. This is left as an exercise to the future
spec writers.
    @niftynei
    niftynei committed Feb 13, 2024
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