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 I am building upon and investing in Lightning. But I feel like a sane person should also be looking into future possibilities. 
 The only “future” layer 2 I’ve heard about is Ark covenants- but it’s confusing to me. Seems like it would require the ark service provider put up way too much bitcoin to meet user liquidity. 
 remember talk about something called Enigma Network but it was probably just a fad to push in some sort of covenant