[tsukikage]

Blockchain is a revolutionary solution to the problem of achieving distributed consensus without a central authority that everyone must talk to and trust.

Unfortunately, this is a problem almost no-one has; meanwhile, where parties are able to agree on a trustworthy central authority - as parties operating within the rule of law, relying on cooperation with protocol and old-fashioned police/lawyers to identify and punish defectors in old-fashioned meatspace, generally are - blockchain is an incredibly expensive solution to the problem of distributed consensus compared to other options available to them.