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View submission: Lightning Network Megathread
We will use a Litecoin/Bitcoin swap for example. The swap would be a person who had one channel on the bitcoin network, and a different channel on the Litecoin network, but allowed forwarding based on some agreed or advertised ratio (likely spot price minus some fee). Therefore, the Litecoin channel close would be with only Litecoin, and the bitcoin channel would only have bitcoin. So either the transaction happens at an agreed upon swap value, or the person holding both coin channels merely doesn't go through with the swap.
So essentially its the same as any single node deciding whether to forward the payment, just the added task of deciding and confirming LTC/BTC ratio. There isn't actually a *channel* across both chains, just a node.
There's nothing here!