I want to reference a term used in blockchain to describe the technology, distributed ledger, specifically the word "ledger." Ledger's aren't new; they've been around for centuries to document transactions between people, and they're simply a written description of a transaction, who the money came from, who it went to, and how much. By looking at this ledger, you can see exactly what took place in this photography business in 1836, and if this person kept all the money recorded here in the same wallet, we would know from this ledger exactly how much money was in their wallet on any given day:
