Earlier quoted context omitted.
Also the courts that enforce the contracts visa makes, the FBI that chases people who commit fraud, the police and jails who enforce the decisions of the court, etc etc. Blockchains can operate without all of those.
A society without contracts, police, or jails is a failed society where you will not be able to reliably power your computer, and where you will be too busy fending off looters to care about blockchain anymore. Bitcoin doesn't even try to replace contracts. Hard-line Ethereum Classic fans think they can replace contracts (they won't).
You can't use a blockchain to protect your land rights, but you can use it to protect digital rights and that means you don't need external resources like courts to spend their time on digital rights. They can focus entirely on land conflicts and other physical matters, which will make them cheaper overall.