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A private blockchain is not open source and does not have a open ledger that people can use to verify. It is primarily designed to be used in a business or corporate environment, leveraging the technology of blockchain to provide value for a corporations internal operations. Quorum, J.P. Morgan's private fork of Ethereum, is currently one of the widely used private blockchain solutions for the business world. You can also find research in this domain by Consensys, IBM and others.