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If you understand ledger systems, take double-entry accounting. Every transaction has two sides, like buying equipment or selling a product is recorded in two ledgers, one as debit and one as a credit. This ensures that the total value of debits always equals the total value of credits. It's like a seesaw, if one side goes up, the other must go down by the same amount to maintain balance. The Medici popularized this system as they ran the entire show. They could check if someone stole something, who ordered it and which transaction was to blame because the final result between the two ledgers did not self balance, did not negate to 0.

Luca Pacioli, a Renaissance mathematician and Franciscan friar, invented the system in 1494. His book, Summa de arithmetica, geometria, proportioni et proportionalità, included a detailed explanation of the double-entry method, making it accessible to a wider audience and helping to establish it as the standard for business accounting.

The Medici family use of the double-entry accounting system, specifically Giovanni di Bicci de' Medici (founder of the Medici Bank) implemented it extensively in their banking operations during the 14th and 15th centuries.

Bitcoin is also a ledger. It creates money by tracking the exchange of something limited. Recording all transactions in a ledger termed a blockchain. Transactions are simultaneously a withdrawal from one wallet and a deposit into another wallet, and all must equate to the rules of ledger or be excluded as a fraudulent transaction. For example, if you have 20 coins, they can all accounted for in the record, ledger, blockchain. The blockchain cannot validate to a total of coin more than 20 and past and present owners of the coins are all recorded in the chain.

It states that a monetary system can be formed by wholly incorporation into a ledger system, where the record is not bails of wool but money itself.