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 single entity is responsible for managing, updating, and protecting the data.
Now you might wonder — if banks have been using this system for decades, what could possibly go wrong?
Let’s think about it.
When one authority holds all the power:
If their system fails, transactions can get delayed or completely stopped.
If their database is compromised, sensitive financial data is at risk.
If an incorrect entry is made, we depend entirely on them to identify and fix it.
And most importantly, users have very little transparency into how these records are handled behind the scenes.
This does not mean centralized systems are bad. In fact, they brought structure, reliability, and scalability to modern banking. But like every technological model, centralization comes with its own set of limitations.
Over time, people began asking an important question:
“What if we could build a system where trust isn’t placed in a single authority?”
What if records were not stored in just one place, but shared across multiple participants?
What if transactions could be verified collectively rather than approved by one controlling body?
This curiosity is exactly what planted the idea for something revolutionary.
And that is where decentralization enters the picture.
Instead of relying on one central ledger, decentralization distributes the ledger across a network of computers. Every participant holds a copy, and transactions are validated through consensus rather than blind trust.
No single entity has complete control.
No single point of failure exists.
And transparency becomes a built-in feature rather than an optional one.
This shift in thinking eventually led to the creation of blockchain — a technology designed to solve the trust problem without requiring intermediaries.
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