Tales from the trenches: We implemented NUT-15 multinut MPP on the wallet side to test it and determine the success rate for multinut payments – turned out to be very low when used with LND. The reason for this is that LND does a pretty good job at cycling through multiple routes until one of them succeeds.

Our approach of sending multinut payments requires quite some low-level manipulation of the payment process in LND and was lacking the ability to cycle through multiple routes – we always attempted a payment with the best route the LND gave us but didn't try any others. Very bad probability.

What we're doing now is to get a list of all routes that LND suggests and try them one by one until one of them succeeds. Requires more statefulness and being "smart" about things (which is often a place you don't want to be in, rather let others be smart, i.e. LND). If anyone knows how to do this in a more LND-ninja way, please let us know.

To be continued.