In the previous articles, we talked about Bitcoin and the mysterious creator behind it.
But Bitcoin cannot exist without a technology called blockchain.
Blockchain is the system that records every transaction that happens in the network.
Understanding blockchain is important because it is the foundation of almost every cryptocurrency today.
At its simplest, blockchain is a digital ledger.
A ledger is just a record that keeps track of transactions. Banks use ledgers to track deposits and payments.
Blockchain works in a similar way, but with one major difference.
Instead of being controlled by a single bank or company, the ledger is shared across many computers around the world.
These computers constantly verify and store the same transaction history.
When new transactions happen, they are added to the system and become part of a permanent record.
Once the data is recorded, it becomes extremely difficult to change or remove.
Here are the key ideas that define blockchain.
1️⃣ A shared digital record
Blockchain is a ledger that is stored across many computers instead of one central authority.
2️⃣ Transactions are grouped into blocks
New transactions are collected together and stored inside blocks of data.
3️⃣ Blocks are connected in a chain
Each block is linked to the previous block, creating a continuous chain of information.
4️⃣ The data becomes very difficult to change
Once a block is added to the chain, altering it would require controlling a huge part of the network.
A simple example can make this easier to understand.
Imagine a notebook that records every payment made in a group of friends.
Instead of one person holding the notebook, everyone has the same copy.
Whenever someone sends money, everyone updates their copy at the same time.
Because the records are shared, it becomes very difficult for anyone to secretly change the history.
This is very similar to how blockchain works.
Blockchain matters because it allows people to trust the system without needing to trust a central authority like a bank.
It creates transparency, security, and decentralization.
That is why blockchain became the foundation of the entire cryptocurrency ecosystem.
📌 In the next article, we’ll explore:
How blockchain actually works behind the scenes when transactions are processed.
If you’re just starting to learn about crypto, follow the Crypto 101 series as we build the foundation step by step. 🚀
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