Consensus Layer
Also known as: Consensus Protocol Layer, Validation Layer, Agreement Layer
The component of blockchain architecture responsible for achieving agreement on the order and validity of blocks.
The consensus layer in a blockchain is the part of the system that ensures all nodes agree on the current state of the network. It determines how blocks are proposed, validated, and finalized. This layer can be distinct from the execution and data layers, especially in modular architectures like Ethereum’s post-Merge design. The consensus layer implements rules for block inclusion, validator participation, and fault tolerance. It’s critical for network security and trustlessness, and is often designed to be modular to allow innovation in execution and scaling layers.