Three planes of decentralization - Data plane (live operati…

Three planes of decentralization
- Data plane (live operation): Who controls block production and transaction inclusion? How hard is censorship?
- Control plane (upgrades/governance): Who can change rules? Is change voluntary (via forks) or enforced (upgrade keys)?
- Access/verification plane: How cheap is it to run a validating node or light client? Is participation permissionless?