While many security features are associated with blockchain, two of the most important are consensus and immutability. Consensus refers to the ability of nodes in a distributed blockchain network to agree on the true state of the network and the validity of transactions. The process of reaching consensus usually depends on the consensus algorithm used by the network.

Immutability, on the other hand, refers to the ability of blockchain to prevent confirmed transaction records from being altered. While these transactions are usually related to the conversion of digital currencies, sometimes they also refer to the recording process of other non-monetary forms of electronic data.

In general, consensus and immutability provide the basic framework for data security in blockchain networks. The consensus algorithm ensures that all nodes follow the system rules and agree on the current state of the network, while immutability ensures the integrity of each block data and transaction record that has been verified for validity. #