The Lisk Core blockchain client is an implementation of the Lisk protocol that verifies data (blocks and transactions) against the protocol rules and keeps the network secure.
To provide a high level overview, the main functionalities are listed below:
The possibility to connect to a subset of peers in the Lisk mainchain’s P2P network.
To synchronize with the Lisk blockchain including requesting, forwarding and processing of the blocks, which also contain the transactions.
To maintain the transaction pool, which might contain a subset of unconfirmed transactions.
To request and forward the unconfirmed transactions.
To possibly generate new blocks when running a validator node.
Furthermore, Lisk Core nodes are able to store all current addresses, balances, and transactions.
With the latest version of Lisk Core, there will be new configurable settings and the modules described in the Modules sub-section will also be used.
The Legacy module maintains all accounts on the Lisk mainchain that received balance transfers to their address in the old 8-byte format, and for which no public key is associated. The Legacy module also implements a command allowing validators without a BLS key to register one.