Liquidity Ads #561
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Liquidity Ads #561
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pm47
reviewed
Dec 1, 2023
Use temporary tag 1337 until we have a final agreement on the spec.
The seller signs a commitment to the lease parameters. It provides the buyer with a way to prove if the seller later cheats.
We allow purchasing inbound liquidity by initiating an empty splice, similar to what we do for CPFP. If the remote doesn't fund, or its rates are too expensive, we immediately abort the splice attempt.
Those rates are sent in `node_announcement` and `init`. We select the rate in the remote `init` message for a lease duration of `0` (no strict lease enforcement through CLTV in the commitment transaction). This matches the proposal in lightning/bolts#878 (comment)
We store liquidity purchases as on-chain outgoing payments, like what we do for splice-outs and splice-cpfp.
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pm47
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pm47
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src/commonMain/kotlin/fr/acinq/lightning/serialization/v4/Serialization.kt
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We know beforehand that the interactive-tx session will fail if our current balance is too low to pay the fees to the requested liquidity.
We use a dedicated discriminator to allow replacing this data entirely in future versions without backwards-compatibility issues.
pm47
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src/commonMain/kotlin/fr/acinq/lightning/channel/states/Normal.kt
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pm47
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dpad85
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Implement a prototype for liquidity ads, compatible with ACINQ/eclair#2550
Note that we only implement the buyer side, which limits testing.
The specification is available here: lightning/bolts#878
We currently don't add CLTV locks to the commitment transactions, for simplicity's sake.
We thus don't store yet the lease in the commitments (to be defined where we should store it, and what data we need).