How does a blockchain work ?
What is blockchain ? Nah , First of all we need to be clear about blockchain and crypto , there is a big misunderstanding between us. That is, many of us think that blockchain means "cryptocurrency". But actually blockchain doesn't mean "cryptocurrency" at all.
Then what is blockchain ?
Actually , Blockchain is a chain of blocks which all are made with data . And this is one of the latest invention in todays world . Now the question is , why blockchain technology is using for cryptocurrency ?
Blockchain technology is too much secured for virtual currency . If any data is changed in the blockchain / trying to change , the other blocks will immediately declare that block as "false" . Because if someone changes the data of the blockchain, then its "hash" number will also change. And when creating each block, its own hash number is written along with the hash number of the previous block. That means whenever you change a hash in the middle on ones block , the subsequent blocks will appear invalid.
Now if you say I will change all the hashes from all blocks then it will take so much time which is beyond your imagination. It will take 10 minutes to change the hash of each block. That means how much time for 10 lakh blocks ? That is why it is almost impossible to change the data of the blockchain. By doing this, no hacker or fraudster will be able to grab someone's information .
So , you can say "Blockchain is impossible to hack"
After all , a question will come to everyone's mind, who verify those blocks ?
I think , you may hear about our Steemit "witness" . Actually in this case , blockchain is run within a Node . Many of us didn't hear before this "Node" word . In this proposal , Node is a connection point of Data . Basically nodes receives data and sending out data's to other computers . And in our steemit platform we knows them as our "witness" .
Is Miners and Nodes are same ?
For running a node into your computer firstly you need to store a blockchain into your computer . For now the size of a blockchain (BTC) is 438.53 GB (November 19, 2022) . But this size is increasing day by day . After install blockchain your computer will consider as a Node . On the other hand if you want to be a miner you need a huge computing power , a bunch of CPUs and GPUs . Also they have different roles . So we clearly say that " they both are different " .
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