how Ripple Xcurrent works?

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 ?

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