Everyone’s talking about bitcoin, but the technology behind it is much more revolutionary. For Michael Casey and Paul Vigna, blockchain technology marks a break in economic history. That’s because it replaces an accounting practice — double-entry bookkeeping — that had shored up faith in financial transactions for over 500 years — until, that is, the financial crash of 2008 revealed that the banks had been fiddling their books. In the age of globalization, Casey and Vigna argue, blockchain could help restore this trust — and, in the process, make diverse things like land registries, supply chains, and copyright more transparent and secure. The Truth Machine offers a pleasingly reflective view of one of the most important new technologies of our time.