Dominic Frisby in Aeon:
The impact of record-keeping on the course of history cannot be overstated. For example, the act of preserving Judaism and Christianity in written form enabled both to outlive the plethora of other contemporary religions, which were preserved only orally. William the Conqueror’s Domesday Book, compiled in 1086, was still being used to settle land disputes as late as the 1960s. Today there is a new system of digital record-keeping. Its impact could be equally large. It is called the blockchain.
Imagine an enormous digital record. Anyone with internet access can look at the information within: it is open for all to see. Nobody is in charge of this record. It is not maintained by a person, a company or a government department, but by 8,000-9,000 computers at different locations around the world in a distributed network. Participation is quite voluntary. The computers’ owners choose to add their machines to the network because, in exchange for their computer’s services, they sometimes receive payment. You can add your computer to the network, if you so wish.
All the information in the record is permanent – it cannot be changed – and each of the computers keeps a copy of the record to ensure this. If you wanted to hack the system, you would have to hack every computer on the network – and this has so far proved impossible, despite many trying, including the US National Security Agency’s finest.