In this will see byfn(Build Your First Network) in hyperledger fabric
So whenever you work with Hyperledger Fabric you have to work with channel and each channel will have peers or each channel will have chain code in-fact each peer will have chain code.
If you want to understand what channel means, let's say you have five nodes if all nodes want to communicate of-course they can be part of one channel so every transaction store in ledger and five node share the same ledger.
What if secrete communication between two nodes, In this case they will have separate channel
So there ledger specific to that they will not share your data with others.
That's how you maintain confidentiality.

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