A technical infrastructure linking Cardano nodes in one unified system to process transactions. Stake pool operators run Cardano nodes that communicate with other nodes to share information about new blocks and transactions. This includes three processes: each operator runs a block-producing node (the node that verifies and creates a block) and two relay nodes (which don’t produce blocks but share information). Wallets and exchanges operate as nodes too. They can help verify blockchain activities by running a block-producing node, which is connected to other relays.