My boss at Citibank had a pedestal in his office with a huge, ancient ledger from the early days of Citibank. Citi goes back a ways. It led the funding of the Union side in the US Civil War after the First Battle of Bull Run. It was four years later that Congress defined the uniform national currency. Paper ledgers, IBM 5081 punch cards, paper tape, and cave drawings contain data but are not database systems any more than a disk drive is a database system. They are merely media. OTOH Microsoft Access is a highly efficient, flexible SQL relational database. Indeed, you could set up Access to handle blockchains. Blockchain functionality is a subset of SQL.
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