Banking Ledgers: The Foundation Behind Decentralization

Hii guys, I'm starting off with blockchain from scratch like literal basics. So, the utmost first thing we need to know about is banking legders - they are the ones which sow seeds for invention of blockchain. What are they ? Okay, now you have ₹10,000 in your bank A and now you have to transfer ₹5000 to your friend's bank account B. When I was a child, I always thought that the amount is being physically transferred from Bank A to Bank. But now we all know that's not the case, instead the details are only being updated. Ledger is like a notebook which maintains records of those transactions and store their data. Only the database is being updated, the amount being transferred and the balance and so on. So, people this is what a leger actually is and banks maintain those ledgers. Centralization and the need for Decentralization: As we saw before, the ledgers are controlled by a central authority that maintains all records. This means the entire system is built on trust, because a singl