Submarine swaps are trust-minimized atomic swaps of offchain bitcoins for onchain bitcoins. A payment secured by an HTLC is routed over LN to a service provider who creates an onchain output paying the same HTLC. The onchain receiver can settle the HTLC to claim its funds, allowing the LN HTLCs to be settled like normal.
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Optech newsletter and website mentions
- Lightning Loop adds support for user swap-ins
- Lightning Labs announces a new tool and service to facilitate submarine swaps