how Ripple Xcurrent works? As per my knowledge Xcurrent uses blockchain. But how it uses blockchain ? Xcurrent or Interledger protocol talk about ledger entries, I would like to know, do they really use blockchain as a ledgers in bank transfer or they use banks native ledgers like (databases or anything)? What is difference between general and sub-ledger?, is sub-ledger is referred as bank's native ledger ?
Taking a look at the "How it works" document on their website, the first time they mention the word "Blockchain" is in their "About the company" section in the end of the document. So I would be quite sure that their product has absolutely nothing to do with any kind of blockchain technology.