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A third-party swap provider built on the proposed VtxoPolicy::Htlc: users pay
bolt11 invoices from their Ark balance without the ASP being the counterparty
and without trusting the bridge with custody.
Scope is deliberately one-directional. An ASP's lightning *receive* is already
free (0 base / 0 ppm on mainnet); the expensive leg is *send*, with a 20 sat
floor that eats 80% of a 25 sat zap. Only that leg is worth undercutting.
- bridge/server.js: /info, /quote, /swap, /refund over Bun.serve. Validates
the user's HTLC fully (policy, hash, amount, expiry margin, full vtxo chain)
before spending anything on Lightning, pays, then claims with the preimage.
Crash-safe: state is written atomically and every step re-checks reality
(listpays before paying, so a resumed bridge never double-pays).
- bridge/ln.js: minimal CLN backend (unix socket or docker exec), named
params, maxfee-capped pay, pending/paid introspection.
- /refund is safe to expose publicly: the ASP only cosigns a preimage-less
HTLC spend when every output pays the refunder, so it cannot be redirected.
tools/ark/bridge-e2e-test.js drives the real HTTP API against the patched
regtest ASP: a 25 sat zap costs 1 sat, the far-end invoice really settles, the
preimage checks out, resubmission is idempotent, an unroutable invoice reports
refundable rather than done, and the refund lands every sat back.
Co-Authored-By: Claude Fable 5 <[email protected]>
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