My thoughts: The ledger preceded currency. Creditors have been enforcing debt repayment on the ledger with a wide range of tools ranging from guilt to imprisonment or worse. Those tools were tailored to an increasingly specialized debtor population. Specialized debtors we’re paid in currency. Currency has historically been debased or inflated. We have been iterating on the ideal currency since the beginning of debt. The blockchain backed systems we are zeroing in on as the next form of ledger eliminate the concept of currency and provide an irrefutable, instant, and affordable way of updating the ledger.

The last part may be wishful thinking.