How are you? By Allah's grace, I'm fine. Today we will know what blockchain is? Blockchain is a collection of blocks. which store data through chains. Blockchain is a place where everyone can go. Any person can access data from one end of the world to the other by using the blockchain system. You can even see who is using which wallet, who has transacted from which wallet, who has been paid, etc. But you will not know any information about his name address etc.

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So far we know about blockchain now let's know what block is. The block is divided into three parts, the first is data, the second is hash and the third is hash of previous block. First is the data, the data is dependent on the blockchain. For example, let's talk about Bitcoin blocks, in a Bitcoin block there are three types of data: Sender, Receiver, Amount. When you send Bitcoin to someone, the sender's address is the recipient's address and the amount you send is data. Then what comes to work is Hash. Hash is a computer generated number. A Hash will be generated when it is written. And if you change any kind of data, the previous Hash will also be changed. And if the old hash is changed for some reason, then the old block will not exist and a new block will be created instead. After all these comes the hash of previous blocks, this is when a block exists in the blockchain, there is another link between it. For example, there is always a previous hash connected with a hash, and if any data is changed in a block or an attempt is made to change, then the hash is changed when the previous data was in the previous hash. As a result, if someone changes the data of the block or wants to hack, then the previous hash will not match and the blockchain will automatically detect that someone is trying to change the data of the block. Then these issues will no longer be included in the blockchain.

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Today's supercomputers are very fast, with the help of which they can easily calculate the data or hash of each block by changing a block. So to prevent such problems there is a system in blockchain which is called Proof of Work. Proof of work is the time it takes to create a block and save it. So it takes approximately 7-10 minutes in blockchain, when you recalculate a new block and write new data, it takes approximately 7-10 minutes to recalculate and add a new hash to it. Because after 7-10 minutes it resets again, all these reasons blockchain is so popular because it is not possible to hack and cannot be hacked.

Today's discussion concludes here. I hope you've found it interesting. Please share your thoughts on today's topic. Prayers for everyone. May everyone be well. Amen.