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Private blockchain

The ledger in blockchain need not necessarily backed by a currency. For a system that need large amount of nodes, like in case of public permissioned blockchain, it is essential to give an incentive either in form of reduction in transaction fee or some currencies. This is a high incentive for those who works with high computational powers. They would demand this. But in case of private blockchain there is no need of providing a currency in the form of incentives.
Private blockchains are used when the peer nods comes to know each at least half of them. They form a network of peer group and validate the transactions. Since private blockchain entitles the identity of each nodes, it is impossible to get a lot of people through. So these private blockchain lacks popularity and hence there is no coin.
But this is extremely helpful in large corporations to store and validate data. They can create a supply chain where everything could be traceable form the very beginning. It involves no scam or fraudster, this is pure cryptography.
The beginning was mostly misinterpreted by many as Blockchain needs a currency to survive. At that time, people found none difference between these two.

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