Ethereum’s August 2022 Merge announcement described the move from proof of work to proof of stake in two stages. Bellatrix would activate on the consensus layer at a specified epoch. Paris would follow on the execution layer when the network reached a defined total-difficulty threshold.
The notice explained that node operators needed compatible execution and consensus clients. It also described the authenticated interface used for communication between them.
This archive brief reports the rollout plan as it was announced, including the distinction between the two activation mechanisms. It is historical context for the network’s architecture, not a request to follow old upgrade instructions on a present-day installation.