@base Modular structure: Bedrock separates the proof-of-stake system from the OP stack, as a rollup may use proof-of-stake, proof-of-validation, or zk-SNARK. This separation enables systems like Cannon to be used as proof-of-stake in the system. Cannon allows Geth to run as is, and through it, support proof-of-stake similar to or equivalent to the EVM. Geth is responsible for executing Ethereum transactions and smart contracts. After the Ethereum merge update, nodes were split into two layers: the consensus layer and the execution layer. Geth is the execution layer of an Ethereum node, and its execution, together with the consensus layer, turns a computer into a full Ethereum node.