The different types of Blockchains: 

• The blockchain is open to the public.-A public blockchain network, also known as a permissionless blockchain network, is one in which anybody can participate without limitation. The majority of cryptocurrencies operate on a public blockchain governed by rules or consensus algorithms.
• Private or permissioned blockchain.-Organizations can regulate who has access to blockchain data using a private, or permissioned, blockchain. Specific sets of data can only be accessed by users who have been granted authorization. A permissioned blockchain is Oracle Blockchain Platform.
• Blockchain that is federated or consortia.-A blockchain network in which the consensus process (mining process) is tightly regulated by a predetermined number of nodes or stakeholders.

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