Broadly, there are two kinds of blockchain network—public and private. Both are P2P networks, where the ledger is distributed among those that can participate in the transaction. The ledger copy is replicated among participants, and those parties that can execute append-only transactions to the ledger will hold a copy of the ledger and will participate to reach a consensus to add a block to the blockchain. Along with being public or private, a blockchain can be both permissionless (such as Bitcoin or Ethereum) and permissioned (such as the Hyperledger blockchain framework).
A permissionless blockchain is also known as a public blockchain because anyone can join the network. Permissionless P2P systems do not require ...
