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 Fedimint and cashu pretty much rely on lightning to be interoperable. This stack is insanely complicated 
 Can you point me to some reading that explains ARK? 
 Sure this can *in theory* replace LN and eCash, but the ASP model is the only weakness in the system as far as I can tell so from reading the arkpill website. Need to think how it can be attacked or regulated by evil actors. 
 I see. The way I understood it, ASPs are lighting nodes too. 
 Actually ecash, Cashu/fedimint don't rely on a specific underlying funding technology. Lightning is nice because it gives instant settlement which is great for the swap ux. It could easily be interoperable with other shitcoins, L2s or even good ol' paper.

It's just custodial tech