Implementations of the present disclosure include receiving, by the centralized sub-system, change data representing a change to an electronic document stored in the centralized sub-system, the change data identifying a user that submitted the change, transmitting, by the centralized sub-system, the change to the decentralized sub-system, recording, by the decentralized sub-system, the change in a change log recorded in a blockchain that is maintained within the decentralized sub-system, the blockchain being stored in multiple nodes of the decentralized sub-system, and editing, by the centralized sub-system, the electronic document based on the change to provide an edited electronic document that is stored in the centralized sub-system.