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Negative. Cashu does not sit on top of lightning. It's protocol is agnostic to Lightning and Bitcoin. Reference implementations of Cashu however do put a dependency on lightning for interoperability and integration to make lightning payments. But this is not a core principle of Cashu itself. Users need to be aware that when they accept a cashu payment, they are NOT holding Bitcoin but rather IOUs. If the mint is honest, it will allow exchanging those IOUs to pay lightning invoices presented.

Tim Bouma 1y ago

FWIW, Lightning doesn’t sit on Bitcoin either. You can put it atop any chain. I get your point, but the value for Cashu (the current implementations) is due to the network effect of Lightning. And yes, like cash, they are transferable IOUs. AFAICT, I am not aware of any non-Lightning implementations of Cashu - I would call these more generically Chaumian mint implementations

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Tim Bouma 1y ago

NUT-04 (mandatory) has a reference to Lightning. So maybe we should be discussing #CashuBTC versus a more generic #cashu that you are referencing.

Cygus 44 1y ago

Then the mint is my custodial. Thanks, I'll check that. Curious how to set up a mint - close to my lnd and bitcoin-core.