Trampoline

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The way Lightning currently works is that the sender calculates the route from its node to the receiver’s node, this means that the sender’s node must have an updated network of nodes, it might not be connected to the receiver directly but it is connected through a path in the network.

This might be fine for Lightning in its current state, but it won’t be if the number of channels expand into the millions due to adoption. Trampoline payments is a new suggested way of outsourcing that aims at having lite clients outsourcing the route computation to trampoline nodes, nodes of higher Memory, bandwidth and computation power.

https://bitcointechweekly.com/front/outsourcing-route-computation-with-trampoline-payments/