🔱Submarine swaps (lightning)

Submarine swaps are used to ensure atomicity for swaps between Smart chains (Solana, Starknet, EVM, etc.) & Bitcoin Lightning network.

Submarine swaps are based on a fact that lightning network payments are a form of hash-time locked contracts (HTLCs) -> in order to settle a bitcoin lightning network invoice, the receiving party must reveal a secret S with hash H(S) equal to payment hash P specified in the invoice. This fact can be used to create a similar hash time locked contract (HTLC) with same hash P on other chains to depend on sending/receiving of lightning network payment.