What is a block? || Blockchain

In our previous article, we explained what is Blockchain why it is useful, and also talked about blocks.

In this article, I am going to explain what is block and how it works.

I told you that nobody in the blockchain can change the data in the middle of it, because the block has three things inside it; data, the hash of the data, and the hash of the previous data which causes the formation of a chain of blocks and if you try to change the data inside any block, you will also change the hash of that block and if you try to change the data inside any block, you will also change the hash of that block and as the hash of that block has changed, now it will not be connected to the next block and if you want to connect it to the next block, then you will have to change the previous hash of the next block which in turn will change the data of the next block and its hash that will cause the change of data in the block next to that.

So, it will be a long, tiring process which is why we say that the data in the blockchain is immutable and you will have to do this process not only in that computer but also in the other computers which make this database so secure.

So, you can use this database where you think you need some robust and secure database that cannot be changed later by someone else. For example, in Cryptocurrency, which is the best example of it, you want that once a transaction has happened it should be saved and it does not change later, so, bitcoin in cryptocurrency is the biggest example of the usage of blockchain. After bitcoin, the blockchain technology had a boom and now multiple other applications are made, After bitcoins, the blockchain technology had a boom and now multiple other applications are made, multiple companies are using it like Microsoft, The World Bank, Morgan Stanley, Amazon, etc.

All of them are using blockchain in one way or other.