Greetings,

A warm welcome to all of you yet again in my post. this is me @hammadahmed112. today, the post is related to Blockchain technology,, and how its works. so, let's start without further wasting any time.

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(1) Write the definition of blockchain. And how our data on Blockchain is protected from hackers. ? And write details about Data, Hash and Previous Hashtag and explain through screenshots.

Write the definition of blockchain.

Source

In today's, world many peoples talk about the word Blockchain so, let's understand what it is. basically, the word Blockchain is the combination of two words the Block and Chain. so, the block is containing the information inside it. this information is about the address of the previous Block or the address of the next block. and the working of Chain is to connect these blocks together.


so, the Blockchain is a combination of blocks and these blocks are connected to the chain. that's why we say blockchain. blockchain technology is rapidly growing with the passage of time. we can see many projects on Blockchain technology, the concept of Blockchain comes in 1991 this concept is given by the two reachers. In 2008, the first Blockchain project comes called "Bitcoin" and we all know that people take interest in Blockchain technology after this project many other projects come like Ether, Steemit, etc.


The purpose of Blockchain technology is to omit third-party interference in our money systems. so, that's why this term becomes common all around the world. People take it seriously. and many peoples would change his life. by adopting this technology.

how our data on Blockchain is protected from hackers. ?

Source
As I previously mentions in Blockchain Technology. the blocks stores the data in it. so, this is a key, feature in Blockchain how our data protects from hackers. In Blockchain every node is connected to another node these nodes have a full address of current and previous nodes. if a hacker hacks the blockchain system so, another node gives access to the system which is really helpful compared to our banking system. but, there are also some features that protect Blockchain technology from hackers. here are the details:


1. Consensus Algorithm: The very thing that protects the Blockchain system is the Consensus algorithm there are various type algorithm that gives the surety to the Blockchain technology which is Proof of BRAIN, Proof of STAKE and Proof of WORK. these algorithms work on cryptographic rules. just like Bitcoin, it follows the POW algorithm. this algorithm gives rewards to the miners on the basis of solving messy puzzles.


2.Large # of Nodes: The second thing which gives the uniqueness to Blockchain technology, and to protect from the Hacker is a Large number of Nodes. if the system is larger like the bitcoin network. so, it means it has a large number of nodes connected to each other. this node gives protection from the hacker. In such a case if the attackers attack the system of Blockchain so, it is not easy to hack because all nodes have an address of the previous, current node, and next node.


3. Decentralization: The third thing is Decentralization. it gives less crucial to attackers. like as I previously told that blockchain technology is free from any central authority so, it gives more power to its user. peoples feel safer in Decentralization that's why they adopt it.

write details about Data, Hash, and Previous Hashtag and explain through screenshots.

There are three parts that are discussed in this answer. the first is Data, Hash, and previous hash. the combination of these three parts is called "Structure of BLOCKS". structuring is very important in anything. so, we discuss Blockchain there are three types of material that build the Blocks. let's discuss one by one:

1. Data:

Data is a very important key factor in a Blockchain network. let's suppose we design a Blockchain network for any food site. so, we need the details of the customer, like wallet balance, address, and type of food. this is the rough example of Data. in our case we discuss the Data in form of Blockchain the concept is applied, just like a Bitcoin network. In Bitcoin what type of data is needed? the answer is very simple we need the amount of BTC, sender address, and receiving address, etc.

2. Hash:

Hash is the 40 character long string. every block has a unique hash character. we cannot identify whats the next is. it is a fully random generated string. hash is a special type of function that encrypts the message and solves the Blockchain computation. In the header of hash, the message is hidden. hash is the backbone of the blockchain network. the purpose of the hash is to encrypt the message and hold it into 40 character string.

Block #:
1
Nounce:
11316
Hash:
7f628ffaa8e670d7371f2bb85ab563052c3d8c8c16adb182d9bfced93ff48002

Block # :
2
Nounce:
11316
Hash:
75b....................

3. Previous Hashtag:

suppose Hash is the parent and the next Hash is a child. so, it means they are connected to each other if you change the data of parent Hash so, in the result the all child hash data is changed. In the new child block, you will find the data previous Hash. The previous hash data is started with zeros and tells the block on the basis of parent hash data. this is the most unique feature of the Blockchain network. that simply, the problems of any kind of fake data.

Block #:
1
Nounce:
11316
Hash:
7805bfab57ef0eb8f3eafd40e92cd07035de2a71460217d38275ce8ddacdd765

Block #:
2
Nounce:
35230
Hash:
5d093b561962073b7357c0569eebd55ceb945ee29de1031aa308238ee37b04aa

Block #:
3
Nounce:
12937
Hash:
59fb8a7ceb5e3c13aa5340d08b9367287e9435a6a30f1f302b10f0359a0d76d9

Conclusion:

Blockchain technology is growing rapidly many organizations are adopting this technology. new tokens come to market daily basis. In the end, this session is very fruitful for me. I am very happy to attempt this session. so, that's it from my side. thanks to prof. @yousafharoonkhan.

Thankyou!

Regards:

@hammadahmed112