I’ve built a Layer 3 Lightning payment clearing engine using private instance of Cashu w/Postgres, LNbits w/Postgres and LND. The goal is a nearly untraceable payment and clearing system sitting on top of Lightning. Still very experimental but promising. It works. Have implemented NIP-05 and NIP-57. Not much to look at but it works. Now focusing on making it production grade. You can read more here: