About two months ago, Lightning Labs released Lightning Loop, a service that allows users to fill or empty Lightning channels without closing them, thus reducing on-chain fees. The service, developed by Lightning Labs developers Alex Bosworth and Bryan Vu, was created to help users manage their liquidity.The Loop service, says Bosworth, is helpful for managing liquidity because “it sidesteps the liquidity problem for Lightning, which is that you can’t do flow rebalancing. If you run out of channel capacity in one direction, there’s no possibility that you can get more in a totally self contained, only-Lightning world. You need to go outside in order to rebalance.”So, the natural step for users to mitigate this problem today is to perform a swap, which occurs on-chain and thus requires a transaction fee — and transaction fees on the Bitcoin blockchain can be quite substantial. With the alpha version of Loop available to the public, Bosworth and Lightning Labs had to think about how to make managing liquidity as efficient as possible.Making Liquidity More EfficientTo address this issue, Bosworth developed a concept called “Hyperloop” as a next step toward solving this problem. Hyperloop is a concept that aggregates swaps so that individual transactions don’t occur on-chain with individualized signatures and outputs. Hyperloop batches inputs together using a method called signature aggregation.“With signature aggregation, if yo...
