Public blockchain

A public blockchain is a blockchain where anyone in the world can become a node in the transaction process. Economic incentives for cryptographic verification may or may not be present. It is a completely open public ledger system. Public blockchains can also be called permissionless ledgers.

These blockchains are secured by crypto economics, that is, economic incentives and cryptographic verification using mechanisms such as PoW or PoS or any other consensus mechanism. Some popular examples of this type of blockchain are Bitcoin, Ethereum, Litecoin, and so on.