Permissionless

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Permissionless blockchains require permission to use it. In other words, there is no barrier to entry to use it. Anyone can run a node, run mining software/hardware, access a wallet and write data onto and transact within the blockchain (as long as they follow the rules of the blockchain). There is no way to censor anyone, ever, on the permissionless bitcoin blockchain.1) “Permissioned vs. Permissionless blockchains: Who will win and will it matter?”, Dustin D, 22 March 2018, Permissionless