Public blockchain: no restrictions on reading block data (which can also be encrypted) and sending transactions.
Private blockchain: direct access to data and the right to send transactions are granted to a limited number of organizations.
Permissionless blockchain: no restrictions related to the identity of transaction validators, i.e., users who can generate blocks.
Permissioned blockchain: transactions are processed by approved individuals that underwent identity verification. A permissioned blockchain doesn’t necessarily have to be private.
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