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 A trust-minimized solution designed to scale Bitcoin and extend the Lightning Network

Ark-like architecture

https://www.spark.info/ 
 So this is like the stack of :
- eCash
- Lightning / Arc VTXO
- Bitcoin 
 
 If it is true What they are promising, this could very well BE the breakthrough for self custodial BTC Coffee payment. Lightning so far only works smoth & cheap, If done custodial.