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Aug 14, 2019
Permissioned blockchains are usually private blockchains which require special permissions to become a node of the blockchain network.

Some public blockchain networks can also be permissioned, anyone can read from these blockchains but special permissions are needed to add transactions.

Example of a public permissioned blockhain is Ripple. In Ripple anyone can perform transactions but only permissioned nodes can verify and add them to blockchain.

Permissionless blockchains are the public blockchains in which anyone can become a node and can participate in the process of mining using various consensus algorithms.

Most public blockchains like Bitcoin and Ethereum are permissionless
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